| A | B |
|---|
| friction | force that opposes motion between two surfaces |
| mass | amount of matter in an object or a measure or the inertia of an object |
| inertia | resistance to change |
| velocity | speed of an object, but in a specific direction |
| force | push or pull |
| weight | measure of gravitational attraction or force or gravity pulling one object toward the center of another object |
| Newton's First Law of Motion | Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by state by forces impressed on it |
| change in motion | the result of unbalanced forces |
| gravity | the force that pulls on objects and causes acceleration if the objects are not balanced by an opposing force |
| speed | distance traveled per unit time |
| Newton's Second Law of Motion | Force is equal to the change in momentum (mV) per change in time. For constant mass, force equals mass times acceleration. F = m x a |
| Newton's Third Law of Motion | For every action, there is an equal and opposite reaction |
| Acceleration | the rate velocity changes with time |
