| Term | Definition |
|---|
| speed | distance traveled divided by the time interval during which the motion occurred |
| velocity | quantity describing both speed and direction |
| momentum | a quantity defined as the product of an object's mass and its velocity |
| acceleration | change in velocity divided by the time interval that the change occurred |
| force | the cause of acceleration or change in an objects velocity |
| balanced forces | forces acting on an object that combine to produce a net force equal to zero |
| unbalanced forces | forces acting on an object that combine to produce a net nonzero force |
| fricition | the force between two objects in contact that opposes the motion of either object |
| gravity | the attraction between two particles of matter due to their mass |
| inertia | the tendency of an object to remain at rest or in motion with a constant velocity |
| free fall | the motion of a body when only the force of gravity is acting on it |
| termnal velocity | the mzximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity |
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