{
    "description": "The task involves a series of suspended small balls arranged in a straight line and closely fitting each other. Then, one ball at one end is lifted and released, colliding with the other balls.",
    "prompt": "Static frontal camera view: A Newton’s cradle assembly (five identical 33 g steel balls; coefficient of friction ≈ 0.01, coefficient of restitution ≈ 0.20) rests atop a black perforated optical table. Four balls hang in contact forming a stationary aligned row; the leftmost ball is pulled back to a nearly horizontal position on its individual suspension string and held propped against the tip of an independent lever mounted to a sliding rail. Upon release, the ball swings back to collide with the stationary row. Momentum transfers sequentially through the chain of balls, launching the terminal ball outward into a swing. The collisions are moderately inelastic, which visibly suppresses the ideal Newton’s cradle behavior across successive oscillation cycles.",
    "assets": {
        "ball-1": {
            "model": "../../assets/obj/ball-2.obj",
            "material": {
                "metal": {
                    "mass": 0.033,
                    "density": 7878.1697,
                    "friction": 0.01,
                    "restitution": 0.202387
                }
            }
        },
        "ball-2": {
            "model": "../../assets/obj/ball-2.obj",
            "material": {
                "metal": {
                    "mass": 0.033,
                    "density": 7878.1697,
                    "friction": 0.01,
                    "restitution": 0.202387
                }
            }
        },
        "ball-3": {
            "model": "../../assets/obj/ball-2.obj",
            "material": {
                "metal": {
                    "mass": 0.033,
                    "density": 7878.1697,
                    "friction": 0.01,
                    "restitution": 0.202387
                }
            }
        },
        "ball-4": {
            "model": "../../assets/obj/ball-2.obj",
            "material": {
                "metal": {
                    "mass": 0.033,
                    "density": 7878.1697,
                    "friction": 0.01,
                    "restitution": 0.202387
                }
            }
        },
        "ball-5": {
            "model": "../../assets/obj/ball-2.obj",
            "material": {
                "metal": {
                    "mass": 0.033,
                    "density": 7878.1697,
                    "friction": 0.01,
                    "restitution": 0.202387
                }
            }
        }
    },
    "tasks": {
        "default": {
            "assets": ["ball-1", "ball-2", "ball-3", "ball-4", "ball-5"],
            "translation": {
                "ball-1": [0.448794, 0.377852, 0.178669],
                "ball-2": [0.448794, 0.397852, 0.178669],
                "ball-3": [0.448794, 0.417852, 0.178669],
                "ball-4": [0.448794, 0.437852, 0.178669],
                "ball-5": [0.448794, 0.457852, 0.178669]
            },
            "orientation": {
                "ball-1": [-90, 0, 0],
                "ball-2": [0, 0, 0],
                "ball-3": [0, 0, 0],
                "ball-4": [0, 0, 0],
                "ball-5": [0, 0, 0]
            },
            "fixed": {
                "ball-1": false,
                "ball-2": false,
                "ball-3": false,
                "ball-4": false,
                "ball-5": false
            },
            "kinematic": {
                "ball-1": false,
                "ball-2": false,
                "ball-3": false,
                "ball-4": false,
                "ball-5": false
            },
            "record": {
                "assets": ["ball-5"],
                "dim": ["x", "y", "z"],
                "fps": 30
            }
        }
    }
}