| A | B |
|---|
| rate | a quantity divided by time. |
| linear motion | motion along a straight-line path. |
| motion is relative | Everything moves even at rest b/c of the sun's orbit. |
| speed | a measure of how fast something is moving. |
| instantaneous speed | the speed at any instant. |
| average speed formula | total distance divided by time. |
| average speed | tells you how long it will take to cover distance. |
| velocity | speed in a given direction. |
| constant velocity | requires both constant speech & constant direction. |
| changing velocity | if either speed or direction are changing the velocity is changing. |
| acceleration | the rate at which the velocity is changing. |
| acceleration applies to | decreases and increases in speed. |
| accelerations measured in | units of speed per time. |
| speed & velocity measured in | distance per time. |
| free fall | motion under the influence of gravitational force only. |
| elapsed time | the time that has passed since the beginning of an event. |
| relative motion | motion that depends on the perspective/point of view: woman on bus is moving, but in relation to her seat she isn't moving. |
| reference point | a place or point used for comparison to determne if something is in motion. |
