| A | B |
|---|
| frame of reference | the object or point from which movements is determined |
| motion | a change in position relative to a frame of reference |
| speed | distance divided by time |
| constant speed | speed that does not change |
| average speed | dividing total distance by total time |
| velocity | speed in a given direction |
| acceleration | final velocity take away original velocity, all divided by time |
| deceleration | a negative speed |
| momentum | equal to the mass of an object multiplied by its velocity |
| law of conservation of momentum | the total momentum of any group of objects remains the same unless outside forces act on the objects. |
| earth | the most common frame of reference |
