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Ch. 5~HKH
Question | Answer |
---|---|
Motion | an object's change in position relative to a reference point |
Speed | the distance traveled divided by the time interval during which the motion occured |
Velocity | the speed of an object in a particular direction |
Acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change |
Force | a push or pull exerted on an object in order to change the motion of the object; force has size and direction |
Newton | the SI unit for force |
Net Force | the combination of all of the forces acting on the object |
Friction | a force that opposes motion between two surfaces that are in contact |
Gravity | a force of attraction between objects that is due to their masses |