| A | B |
|---|
| motion | a change in position |
| distance | the length of the route between two points |
| displacement | the distance and direction of an object's change in position from the starting point |
| frame of reference | something that is not moving with respect to an observer that can be used to detect motion |
| relative motion | a movement in relation to a frame of reference |
| vector | a quantity that includes both size and direction |
| speed | the distance an object travels per unit of time |
| instantaneous speed | the speed at a given point in time |
| velocity | a measure that includes the speed of an object and the direction of its motion |
| acceleration | changes in speed or direction |
| constant acceleration | a steady change in velocity |
| average speed | total distance traveled divided by time |
| scalar | a quantity that only includes size |
