| A | B |
|---|
| rate | any change over time |
| speed | the rate change in position |
| constant speed | speed that does not vary |
| average speed | the total distance traveled divided by the total time of travel |
| speed | distance/time |
| velocity | describes both speed and direction |
| acceleration | can occur through a change in speed or a change in direction |
| acceleration | change in velocity/time |
| meters per second | unit for velocity |
| meters per second squared | acceleration |
| force | push or pull one body exerts on another |
| balanced forces | forces that are equal in size and opposite in direction |
| net force | changes the velocity of an object |
| inertia | the tendency of an object to resist any change in motion |
| Newton's first law of motion | an object moving at a constant velocity keeps moving at that velocity unless a net force acts on it |
| friction | depends on the kinds of surfaces and the force pressing them together |
| gravity | force that every object in the universe exerts on every other object |
| gravitational force | depends on masses and distance between objects |
| weight | measure of the force of gravity on an object |
