| A | B |
|---|
| acceleration | rate of change of velocity |
| average speed | total distance divided by the total time |
| balanced forces | forces equal in size and opposite in direction |
| constant speed | speed that does not change |
| force | a push or pull exerted on an object |
| friction | force that opposes motion between surfaces |
| gravity | force exerted by every object in the universe on every other object |
| inertia | tendency of an object to resist change in motion |
| instantaneous speed | rate of motion at a point in time |
| net force | type of force that changes motion of an object |
| speed | rate of change of position |
| velocity | speed + direction of a moving object |
| weight | measure of the force of gravity on an object |
| scale | instrument to measure weight |
| newton | SI unit of force |
| balance | instrument to measure mass |
| displacement | straight line change in position and the direction of the change in position |
| distance | the length of the actual path taken when an object changes position |
