| A | B |
|---|
| frame of reference | background or point that is assumed to be stationary and is used for comparison when motion iis described |
| motion | a change in position in a certain amount of time |
| speed | the rate at which an object moves |
| distance | the length between two places |
| velocity | is speed in a given direction |
| acceleration | the rate of change in velocity |
| circular motion | the velocity of an object in circular motion is constantly changing because direction is constantly changing |
| momentum | all moving objects have this |
