| A | B |
|---|
| motion | change in position of an object |
| speed | distance traveled per unit time |
| velocity | speed in a given direction |
| Newton's first law | law of inertia ( object in motion stays in motion, object at rest stays at rest) |
| force | push or pull that causes an object to move |
| Inertia | tendency of an object to resis changes in velocity or motion |
| mass | measure of an objects inertia |
| acceleration | rate of change in an object velocity |
| net force | sum of all forces acting on an object |
| Newton's second law | F = ma |
| friction | force that resis motion between two objects in contact |
| gravity | force of attraction between all objects in the universe |
| weight | gravitational force acting on an object |
| projectile | object accelerated by a force and continuing to move through it own inertia |
| centripetal force | force holding an object in a circular path |
| Newton's third law | every action there is an opposite and equal reaction |
| momentum | mass times velocity |
| conservation of momentum | total momentum in a closed system is neither created or destroyed |
| work | force times distance |
| potential energy | energy stored in an object because of its position |
| kinetic energy | energy in motion |
| power | rate at which work is done on an object |
| efficiency | ratio of work out put to the work input expressed as a percentage |
