| A | B |
|---|
| Speed | distance traveled divided by the time interval during which the motion occured |
| 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 divide by the time interval in which the change occured |
| Force | the cause of acceleration, or change in an object's 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 to produce a net nonzero force |
| Friction | 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 |
| Terminal Velocity | the maximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity |
