| A | B |
|---|
| Frame of reference | a system of objects that are not moving with respect to one another |
| instantaneous speed | rate at which an object is moving at a given moment in time |
| speed | ratio of the distance an object moves to the amount of time the object moves |
| velocity | speed and direction an object is moving relative to a reference time |
| relative motion | movement in relation to a frame of reference |
| free fall | movement of an object toward earth because of gravity |
| average speed | total distance traveled divided by the time it takes to travel that distance |
| distance | the length of a path between two points |
| Constant acceleration | steady change in velocity |
| Acceleration | rate at which velocity changes |
| resultant vector | the vector sum of two or more vectors |
