| word | definition |
| force | a push or a pull |
| gravity | the force of attraction that exsists between any two objects |
| mass | the amont of matter in an object |
| weight | a measure of the pull of gravity on an objects mass |
| newton | in the metric system it is the unit usee to measure force or weight |
| net force | the combination of all the forces acting on an object |
| balanced forces | equal forces acting in opposite directions |
| relative motion | the change in position of one object compared to the position of another |
| frame of reference | the object an observer uses to detect motion |
| speed | the distance an object moves in a certain period of time |
| instantaneous speed | the speed at any given point |
| speedomoter | a device that shows instantaneous |
| velocity | a measure of both the speed and direction of a moving object |
