| A | B |
|---|
| work | The force that changes the motion of an object. |
| energy | The ability to do work. |
| machine | A tool that makes work easier to do. |
| simple machine | A machine with few or no moving parts. |
| lever | A straight bar that moves on a fixed point. |
| wheel and axle | A wheel that runs on a post. |
| pulley | A simple machine that uses a wheel and rope. |
| ramp | Another name for an inclined plane. |
| inclined plane | A flat surface that is raised at one end. |
| wedge | Two inclined planes placed back to back. |
| screw | An inclined plane wrapped into a spiral. |
| compound machine | Two or more simple machines put together. |
