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