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science quiz motion
Question | Answer |
---|---|
Newton's first law of motion | An object at rest stays at rest or an object that is moving at a speed in a straight direction keeps moving at that speed unless another force acts on it |
Newton's second law of motion | The amount of force needed to make an object change its momentum depends on the mass of the object and the acceleration required |
Newton's third law of motion | For every action there is an equal and opposite action (or force) |
Acceleration | the rate of change in velocity |
velocity | describes the speed and direction of an object |
Mass | the amount of an object |
Terminal | the greatest velocity a falling object reaches |
Horizontal | velocity parallel to the Earth's surface |
Centripetal | the force on an object pulling toward the center of a circular path |
Speed | the rate of change in position (or rate of motion) |
Rate | ratio between two different quantities |
Inertia | property of a body that resists any change in velocity/the ability of an object to stay still or keep on going |
Rest | zero velocity |
Momentum | mass of an object multiplied by its velocity |
Air Resistance | upward force of air against a moving object |
Vertical | velocity in an up or down direction |
Newtons | unit of measurement for force |
Force | a push or pull exerted on one body by another |
Forces always come in _______ | pairs |
Two objects with the same velocity must be moving in the same _______ | direction |
Gravity | a force that acts on all objects on Earth |
Friction | the force that opposes the motion of two touching surfaces |
Pressure | amount of force per unit area |