| A | B |
|---|
| simple machine | something that helps people use forces to make thier work easier |
| lever | a simple machine made up of a stiff arm that turns on a fulcrum |
| fulcrum | the point that a lever turns on |
| inclined plane | simple machine with a slanted surface |
| screw | an inclined plane wrapped around a post |
| wedge | two inclined planes joined back to back |
| pulley | simple machine made of a rope or chain wrapped around a wheel |
| wheel & axle | a machine made of a large wheel attached to a post, or axle |
| gear | wheel with teeth on its outer edge |
