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ground is a kind of object
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if the speed of an object keeps decreasing, the object will come to stop
1
a wagon is a kind of object
1
friction causes the speed of an object to decrease
1
when the wagon is moving down the hill, it is moving against the ground
1
friction occurs when two object 's surfaces move against each other
1
as the friction increases, the resistance on the object to move will increase
1
a toy car is a kind of object
1
as the resistance on the object to move increase, the object will move slower
1
as roughness of a surface increases , friction will increase
1
wood has a smooth surface
1
carpet has a rough surface
1
friction causes the speed of an object to decrease
1
a ramp is a kind of object
1
sliding is a kind of moving
1
a block is sliding down a ramp
1
a block is a kind of object
1
friction occurs when two object 's surfaces move against each other
1
friction causes the speed of an object to decrease
1
pool balls are moving on the surface of the felt of the pool table
1
a pool table is a kind of object
1
a pool ball is a kind of object
1
friction occurs when two object 's surfaces move against each other
1
friction causes the temperature of an object to increase
1
oil is used to decrease the friction among parts in the car engine
1
heat means temperature increases
1
ramp is a kind of surface
1
putting a rough paper on the ramp will increase the roughness of the ramp
1
as roughness of a surface increases , friction will increase
1
a ball is a kind of object
1
gravity pulls objects towards planets
1
gravity is a kind of force
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
marble is a kind of object / material
1
gravity is a kind of force
1
a rock is a kind of object
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
gravity is a kind of force
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
gravity is a kind of force
1
a ball is a kind of object
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
gravity is a kind of force
1
a ball is a kind of object
1
sinking means moving down
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
gravity is a kind of force
1
marble is a kind of object / material
1
gravity is a kind of force
1
gravity causes objects that have mass / substances to be pulled down / to fall on a planet
1
a pencil is a kind of object
1
a decrease is a kind of change
1
if something changes when something else changes, then that something depends on that something else
1
as the mass of an object decreases , the force of gravity on that object will decrease
1
the mass of an object causes the gravitational force exerted by that object
1
if something causes something else then that something else depends on that something
1
if something causes something else then that something else depends on that something
1
the mass of an object causes the gravitational force exerted by that object
1
flying an object requires lift to oppose the object 's weight
1
a glider is a kind of object
1
there is a negatively-charged piece of cloth
1
a cloth is a kind of object
1
there is a negatively-charged plastic strip
1
a plastic strip is a kind of object
1
if two objects have the same electrical charge then those two objects will repel each other when they are close to each other
1
charge is a property of an object and includes ordered values of negatively-charged / neutral / positively-charged
1
a nail is a kind of object
1
magnetic attraction pulls two objects together
1
if battery in an electromagnet is active then the nail in the electromagnet will become magnetic
1
the student connects the wire wrapping an iron nail to a battery
1
a soccer ball is a kind of ball
1
as force exerted on an object increases , distance travelled will increase
1
a soccer player kicks a soccer ball
1
a ball is a kind of object
1
if an object is kicked then force is exerted on that object
1
a rock is a kind of object
1
a lever is used for lifting / moving heavy objects
1
pedalling a bicycle requires moving the pedals in a circular motion
1
pedals are part of a bicycle for pedalling
1
an inclined plane increases the distance over which an object travels
1
an inclined plane decreases the force required to move an object to a different altitude
1
speed is a measure of distance travelled by an object divided by time
1
race is when vehicles / humans compete in speed
1
unbalanced force causes objects to move
1
a book is a kind of object
1
a book on the table starts to move horizontally
1
40 m/s describes the speed of an object
1
north / northward is a kind of direction
1
velocity is a measure of a speed in a direction
1
humans have been on earth for 300000 years
1
insects have been on earth for 400000000 years
1
fish have been on earth for 419000000 years
1
reptiles have been on earth for 370000000 years
1
mammals give birth to live young
1
mice give birth to live young
1
monkeys give birth to live young
1
bats give birth to live young
1
trout is a kind of fish
1
gills are a part of trout
1
the kind of fruit produced by trees is a chracteristic of trees
1