| A | B |
|---|
| fulcrum | a point on which a lever rocks back and forth |
| gear | wheel with teeth |
| screw | inclined plane wrapped around a post |
| wheel and axle | wheel that turns on a post |
| force | a push or pull |
| gravity | a pulling force between objects |
| friction | a force that slows or stops objects |
| work | what is done when a force makes an object move |
| wedge | made of 2 inclined planes |
| see-saw | example of a lever |
