| A | B |
|---|
| frame of reference | system of objects that are not moving with respect to one another |
| relative motion | movement in relation to a frame of reference |
| distance | length of the path between two points |
| vector | quantity that has a direction associated with it |
| resultant vector | vector sum of two or more vectors |
| speed | ratio of the distance an object moves to the amount of time the object moves |
| average speed | total distance traveled divided by the time it take to travel that distance |
| instantaneous speed | rate at which an object is moving at a given moment in time |
| velocity | speed and direction an object is moving, measured relative to a reference oint |
| acceleration | rate at which velocity changes |
| free fall | movement of an object toward Earth because of gravity |
| constant acceleration | a steady change in velocity |
| linear graph | graph in which the displayed data form a straight line |
| nonlinear graph | graph in which the displayed data form a curved line |
| displacement | the direction and distance from starting point to ending point |
