| A | B |
|---|
| Weight | the measure of the force of gravity upon an object. |
| Friction | is the force that one surface exerts upon another. |
| fluid | friction: liquids and gasses |
| sliding | when one or both surfaces are moving or rubbing together |
| rolling | when one or both surfaces are spinning |
| static | when neither surface is moving |
| law of universal gravitation | The_______ states that the force of gravity acts between all objects (matter) in the universe (everything, everywhere). |
| Gravity | is the force that pulls objects towards more massive things (like Earth). |
| Newton’s Second Law of Motion | states that the net force of an object is equal to the net product of it acceleration and its mass. |
| force | mass x acceleration |
