| A | B |
|---|
| motion | an objects change in position relative to a reference point |
| speed | the distance traveled divided by the time interval during which the motion occurred |
| velocity | the speed of an object in a particular direction |
| acceleration | the rate at which velocity changes over time; accelerates if its speed, direction, or both change |
| force | push or pull exerted on an object in order to change the motion of the obect; has size and direction |
| newton | the SI unit for force, symbol N |
| net force | the combination of all the forces acting on an object |
| friction | a force that opposes motion between two surface that are in contact |
