| A | B |
|---|
| speed | how fast |
| instantaneous speed | how fast at an instant in time |
| velocity | how fast and in what direction |
| resultant | vector obtained by adding two vectors |
| average speed | total distance/total time interval |
| velocity vector | show velocity as an arrow, the length shows how fast and the direction shows which way |
| magnitude | the "how much" part of a vector |
| direction | the "which way" part of a vector |
| acceleration | rate of change of velocity |
| free-fall | motion under the influence of gravity only |
| parallelogram rule | graphical method of adding vectors |
| vector | a quantity decribed by a "how much" and a "which way" |
