| A | B |
|---|
| position | a certain place |
| frame of reference | things around you that you can sense and use to describe motion |
| relative motion | a motion that is described based on a frame of reference |
| speed | a measure of an objects change in position during a unit of time |
| motion | a change of position |
| force | a push or pull |
| newton | the metric or systeme International (SI), unit of force |
| friction | a force that keeps objects that are touching each other from sliding past each other easily |
| acceleration | a change in speed or direction of an object's motion |
| gravity | a force that pulls all objects toward each other |
| weight | a measure of the force of gravity upon an object |
