| A | B |
|---|
| motion | change in position |
| slope | instantaneous speed |
| constant speed | speed does not vary |
| average speed | distance/time |
| velocity | speed with direction |
| acceleration | rate of change of velocity |
| force | push or pull |
| balanced forces | equal and opposite push or pull |
| net force | force that always changes the velocity of an object |
| inertia | tendency of an object to resist a change in motion or rest |
| friction | force that opposes motion |
| Newton's First Law | Law of inertia |
| gravity | two objects exert a force on one another |
| weight | the force of gravity on an object |
| unit of weight | Newton |
| unit of mass | gram |
