| A | B |
|---|
| mass | the amount of matter in an object |
| weight | mass times gravity |
| volume | the amount of space an object takes up |
| force | a push or pull exerted on an object |
| velocity | speed plus direction |
| speed | distance/time |
| acceleration | distance/time/time + direction |
| momentum | mass times velocity |
| work | force times distance |
| power | work/time |
| centripetal force | a force that causes an object to move in a circle |
| friction | the force one surface exerts on another when they are rubbed together |
| inertia | the tendency of an object to resist any change in motion |
| deceleration | slowing down |
| gravity | the force that pulls object to earth |
| terminal velocity | the maximum velocity a falling object can achieve |
| free fall | the motion of a falling object when the only force acting on it is gravity |
| frame of reference | what you are comparing your position to |
| net forces | the overall force on an object when the individual forces are added together |
| balanced forces | equal forces acting on an object in opposite directions |
