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now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | its velocity will not change . neither its speed nor its direction will change . so this one is absolutely true . | statement2 : what unbalanced force would be able to change a moving objects direction without also changing its speed via gravity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if the planet was n't there , it would just keep going on in that direction forever and forever . but the planet right over here , there 's an inward force of gravity . and we 'll talk more about the force of gravity in the future . but this inward force of gravity is going to accelerate this object inwards while it tr... | why do n't the moons crash into their planets due to the force of gravity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if the planet was n't there , it would just keep going on in that direction forever and forever . but the planet right over here , there 's an inward force of gravity . and we 'll talk more about the force of gravity in the future . but this inward force of gravity is going to accelerate this object inwards while it tr... | why do n't the moons crash into their planets due to the force of gravity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what does sal mean by an unbalanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | what is `` magnitude '' ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | how can an unbalanced force acting on an object always change its velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . | what 's a net force , exactly ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this is absolutely true . this is actually even another way of rephrasing newton 's first law . if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . | even though the planets are now moving , why has the spinning stopped ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but this inward force of gravity is going to accelerate this object inwards while it travels . and so after some period of time , this object 's velocity vector -- if you add the previous velocity with how much it 's changed its new velocity vector . now this is after its traveled a little bit -- its new velocity vecto... | what does 'velocity ' mean ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | that would be true . but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | what is the difference between velocity and speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | there will always be some minuscule ones , but we 'll assume no gravitational interactions . absolutely no particles that it 's bumping into , absolute vacuum of space . this thing will travel on forever . | why does vacuum not cause friction ... ... .there must be something ... ... is it possible to have nothing ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | ok , so the newton 's first law of motion states that a moving object will continue to be in the state of motion at the same speed unless a force is applied on it to change it 's speed , right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | so , what happen when change the speed of the ceiling fan to bring it up to a specific speed , that too , in gravity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' | why do we fall backward when a car starts suddenly from a rest position ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i had written `` impact the object 's velocity , '' then this would be a true statement . an unbalanced force on a body will always impact the object 's velocity . that would be true . | what exactly does unbalanced mean ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | if the net force of an object is 0 , does n't that mean that the object is not moving ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this thing will travel on forever . its velocity will not change . neither its speed nor its direction will change . | so when it says that the velocity does not change , does it mean that the object 's velocity is 0 ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . | why the planets are inclined at specific angles towards sun tilting their axis ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | how does an object get caught in the gravitational pull of another object ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | would n't the forward momentum pull the object out ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and the key word right over here is `` speed . '' if i had written `` impact the object 's velocity , '' then this would be a true statement . an unbalanced force on a body will always impact the object 's velocity . that would be true . | so if an object has neither a friction force nor air resistance to stop it , would it move forever just with giving it an initial velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | suppose if take the earth 's elliptical orbit , dose speed of earth change at different positions ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . | what exactly is net force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this is absolutely true . this is actually even another way of rephrasing newton 's first law . if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . | how is newton made and what is motion mean ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what does 'unbalanced force ' mean , and could you give a real world example of a balanced force and an unbalanced one ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what is the definition of an unbalanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | well , the skater is going to travel . their direction is actually going to change . and they could hold on to the rope , and as long as they hold on to the rope , they 'll keep going in circles . | if you were in a car going 20 miles an hour , an you were accelerating 20 miles a second , then if you all the sudden stopped accelerating , and you were going a constant speed of 80 miles an hour would you be pushed forward in your seat , because of the sudden change in acceleration ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | there will always be some minuscule ones , but we 'll assume no gravitational interactions . absolutely no particles that it 's bumping into , absolute vacuum of space . this thing will travel on forever . | if you are in a vacuum does gravity affect you ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this was its speed right here . if the planet was n't there , it would just keep going on in that direction forever and forever . but the planet right over here , there 's an inward force of gravity . | if i throw a ball in space where there is no gravity , air resistance and any other forces , is it going to move with constant velocity forever or accelerate forever ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but the planet right over here , there 's an inward force of gravity . and we 'll talk more about the force of gravity in the future . but this inward force of gravity is going to accelerate this object inwards while it travels . and so after some period of time , this object 's velocity vector -- if you add the previo... | but when i throw the ball i put a force on it so that it start moving ( f=ma , ball accelerate from zero to move ) , why is n't it accelerate forever when no other force resist it ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | so technically , if the object was acted upon even by the tiniest of friction , like in the skating rink , its speed would change ever so slightly , right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . | what is the difference between no net force and zero net force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | its velocity will not change . neither its speed nor its direction will change . so this one is absolutely true . | if the earth remains a constant speed how does the earth change its direction if there is no gravity acting on it ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | an unbalanced force on a body will always impact the object 's velocity . that would be true . but we wrote `` speed '' here . | if a cube was planet , then would a spherical moon still have a elliptical orbit ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' | if the velocity of an object stays the same when the net force on it is zero , would n't the reason why objects tend come to a rest be that the forces are becoming `` balanced '' ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | will it be travelling in the same speed after 1 year ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | that would be true . but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | what 's the difference between speed and velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . | can friction be completely reduced to zero ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i apply it in that same direction , i 'm just going to accelerate it in that same direction . so i wo n't necessarily change it . even if i were to act against it , i might decelerate it , but i wo n't necessarily change its direction . | how can the unbalanced force wo n't change the direction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this is absolutely true . this is actually even another way of rephrasing newton 's first law . if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . | does newton 's first law apply to it or not ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i had written `` impact the object 's velocity , '' then this would be a true statement . an unbalanced force on a body will always impact the object 's velocity . that would be true . | in which cases an object will remain stationary and when will have a constant velocity when we apply some force against friction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this is absolutely true . this is actually even another way of rephrasing newton 's first law . if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . | what is the newtons second law of motion ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and we 'll cover that in much more detail . but the simple answer is , unbalanced force on a body will always impact its velocity . it could be its speed , its direction , or both , but it does n't have to be both . | can someone give me a 'simple picture ' of what happens at quantum level ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | does n't newton 's 3rd law say that for every force there is an equal but opposite force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | how can a force be unbalanced ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | there will always be some minuscule ones , but we 'll assume no gravitational interactions . absolutely no particles that it 's bumping into , absolute vacuum of space . this thing will travel on forever . | for statement 1 , how can you make the assumptions , and if space is a vacuum , would n't the object be sucked into deep space already ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | that would be true . but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | at what is the difference between speed and velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' so i 'll let... | ok so we have an object moving but it has multiple forces acting on it but it still keeps moving.so what would be type of forces acting on it like balanced , unbalanced , zero or absent ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . | what is a net force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what is an unbalanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' so i 'll let you think about that . | in statement # 2 , a unbalanced force not only can affect the object 's velocity , but can also change the shape of an object , right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | why the inertia of the heavy object is greater then that of less heavy object ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | what would happen if an unbalanced force acts on an object but does n't change the direction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i 'm inside of a pool or even if there 's absolutely no current in the pool , and if i were to try to push some type of object inside the water , it eventually comes to stop because of all of the resistance of the water itself . it 's providing an unbalanced force in a direction opposite it 's motion . that is what ... | if statement 2 does not assume the body is in motion , then how does statement 2 account for the scenario where a body is not in motion and has force of x in one direction and a friction force of 2x in the opposite direction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | it can , like these circumstances , but not always . so `` always '' is what makes this very , very , very wrong . | why is # 2 wrong ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | if there was an unbalanced force would n't it affect the speed of the object ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | for example if you 're pushing a rock with a a force of 3 newtons , and friction is pushing at 2 newtons , and then you start pushing harder with a force of 4 newtons , would n't that affect the object 's speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | would a balanced force affect an object 's speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | statement number two , `` an unbalanced force on a body will always impact the object 's speed . '' also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' | light can also be heat right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | is n't the accelerate also impact the objects speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what does sal mean by `` unbalanced force '' ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | that would be true . but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | what is the difference between velocity and speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | statement number two , `` an unbalanced force on a body will always impact the object 's speed . '' also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' | can you tell which kind of force or how can the lizard stick to the wall and also be able to walk up along the side of the wall ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | could you elaborate a little more on why the objects `` speed '' does not change ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i apply it in that same direction , i 'm just going to accelerate it in that same direction . so i wo n't necessarily change it . even if i were to act against it , i might decelerate it , but i wo n't necessarily change its direction . | in the 2nd example , when the skater lets go of the rope , wo n't the speed increase ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but this inward force of gravity is going to accelerate this object inwards while it travels . and so after some period of time , this object 's velocity vector -- if you add the previous velocity with how much it 's changed its new velocity vector . now this is after its traveled a little bit -- its new velocity vecto... | sal mentions a `` velocity vector '' , what is a velocity vector ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' so i 'll let you think about that . | on the 4th statement : while an unbalanced force on an object may send it in the same vector , its likely that its second degree derivative will change , thus its not as wrong as implied ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | 5 , just to make sure ; speed and velocity are different right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | speed is a scalar quantity and velocity is a vector quantity right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | this is absolutely true . this is actually even another way of rephrasing newton 's first law . if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . | what is the displacement of a shopper in a downtown mall who first walks 100m straight east and then walks 125m straight west ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and this is the example we gave . if i take an object , if i take my book and i try to slide it across the desk , the reason why it eventually comes to stop is because we have the unbalanced force of friction -- the grinding of the surface of the book with the grinding of the table . if i 'm inside of a pool or even if... | if you slide a book across the table that is entirely smooth and goes on forever , wo n't the book still stop because of the book 's friction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but this inward force of gravity is going to accelerate this object inwards while it travels . and so after some period of time , this object 's velocity vector -- if you add the previous velocity with how much it 's changed its new velocity vector . now this is after its traveled a little bit -- its new velocity vecto... | do acceleration and velocity have the same unit of measure of m/s^2 ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | sal said that the satellite changes its direction but not its speed.so if that same planet is moving around the sun , should n't the speed of the satellite vary if it has to go around the planet ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | and the key word right over here is `` speed . '' if i had written `` impact the object 's velocity , '' then this would be a true statement . an unbalanced force on a body will always impact the object 's velocity . that would be true . but we wrote `` speed '' here . | 1 , if the net force on a body is zero , would it have any velocity or would it be a stationary object ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so the force , the inward force , the tension from the rope pulling on the skater in this situation , would have only changed the skater 's direction . so and unbalanced force does n't necessarily have to impact the object 's speed . it often does . | for statement 2 , if an object has a constant `` speed '' and and a unbalanced force pushes it for any direction , would n't the speed of the object increase/ decrease ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | interesting . statement number two , `` an unbalanced force on a body will always impact the object 's speed . '' also an interesting statement . | why `` an unbalanced force on a force on a body will always impact the object 's speed '' is false ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | that would be true . but we wrote `` speed '' here . speed is the magnitude of velocity . it does not take into account the direction . | why not speed only velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so let 's think about these statement by statement . so our first statement right over here , `` if the net force on a body is zero , its velocity will not change . '' this is absolutely true . | if the net force acting on an object is zero , it does n't accelerate , so its acceleration is constant right ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but this inward force of gravity is going to accelerate this object inwards while it travels . and so after some period of time , this object 's velocity vector -- if you add the previous velocity with how much it 's changed its new velocity vector . now this is after its traveled a little bit -- its new velocity vecto... | cant an object have a constant acceleration and have an increasing velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | is the rope an unbalanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | well , the skater is going to travel . their direction is actually going to change . and they could hold on to the rope , and as long as they hold on to the rope , they 'll keep going in circles . | quick question how is # 2 question going to change direction instead of speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i have some type of object that 's just traveling through space with some velocity -- so it has some speed going in some direction , and maybe it 's deep space . and we can just , for purity , assume that there 's no gravitational interactions . there will always be some minuscule ones , but we 'll assume no gravita... | can we use physics to test how far earth has traveled using our gravitational pull and slowly getting farther from the sun ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | but imagine we 're looking at an ice skating rink from above . and you have an ice skater . this is the ice skater 's head . and they are traveling in that direction . | for statement # 2 on the example of the ice skater , what unbalanced or net force could represent the poll and the rope ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if i had written `` impact the object 's velocity , '' then this would be a true statement . an unbalanced force on a body will always impact the object 's velocity . that would be true . | why does force require specifically acceleration and not velocity ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | if gravitational force is acted on the moon by a planet then why only it rotates and not changes its direction ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | an unbalanced force on a body will always impact the object 's velocity . that would be true . but we wrote `` speed '' here . | or would it not work like a trebuchet , in which the projectile is facing the horizontal plane , but ends up flying much higher than that ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | also , would the skater continue moving at the same speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what exactly is the difference between an unbalanced force and a balanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' so i 'll let you think about that . | in the second statement , if the unbalanced force is in the favour of the motion then the velocity will change but since the direction is the same the force will only affect the speed and not the direction so wont the second statement be true ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | also an interesting statement . statement number three , `` the reason why initially moving objects tend to come to rest in our everyday life is because they are being acted on by unbalanced forces . '' and statement four , `` an unbalanced force on an object will always change the object 's direction . '' | what causes objects to move or stay still ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | when is normal force applicable ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | can someones define an unbalanced force for me ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so if that is some type of planet , and this is one of the planet 's moons right over here , the reason why it stays in orbit is because the pull of gravity keeps making the object change its direction , but not its speed . its speed is the exact right speed . so this was its speed right here . | what is the difference between speed and average speed ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this is not true . an unbalanced force on an object will not always change the object 's direction . it can , like these circumstances , but not always . | what if there is no net force acting on the object that is there is no friction acting on the object , will the object will continue to go without stopping ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | wnat is balanced and unbalanced force ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | so this was its speed right here . if the planet was n't there , it would just keep going on in that direction forever and forever . but the planet right over here , there 's an inward force of gravity . | but , i want to know if the satellite orbiting on earth goes on forever ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | if the planet was n't there , it would just keep going on in that direction forever and forever . but the planet right over here , there 's an inward force of gravity . and we 'll talk more about the force of gravity in the future . | what is gravity or gravitational force are both are different or same ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what wwould be an `` unbalanced force '' ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | an unbalanced force on a body will always impact the object 's velocity . that would be true . but we wrote `` speed '' here . | what maths skills would you recommend for physics ? |
now that we know a little bit about newton 's first law , let 's give ourselves a little quiz . and what i want you to do is figure out which of these statements are actually true . and our first statement is , `` if the net force on a body is zero , its velocity will not change . '' interesting . statement number two ... | let 's say i have a block right over here , and it 's traveling with some velocity in that direction -- five meters per second . if i apply an unbalanced force in that same direction -- so that 's my force right over there . if i apply it in that same direction , i 'm just going to accelerate it in that same direction ... | what is an unbalanced force ? |
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