| A | B |
|---|
| Force | a push or pull |
| A force gives... | energy to an object, causing it to sometimes start moving, stop moving, or change direction. |
| Two forces in the same direction __ together. | add |
| When two forces act in opposite directions, they combine by ___. | subtraction |
| net force | The resultant (remaining force) when forces are combined. |
| balanced forces | When forces are combined the result (or net force) is zero, therefore the object does not move. |
| Friction | A force resulting from to surfaces touching. |
| Basic Forces | gravity, electromagnetic, subatomic, nuclear |
| Friction causes... | Objects to slow down and finally stop. |
| Types of friction | sliding friction, rolling friction, and fluid friction |
| Sliding Friction | When solid object slide over one another |
| Rolling Friction | Friction produced by wheels or ball bearings. |
| Fluid Friction | The force exerted by a fluid. |
