| A | B |
|---|
 | Compound machine. Levers, wheel and axle and screws |
| Inclined plane | a flat slanted surface such as a ramp |
| wedge | two inclined planes back to back |
| lever | has two parts, a bar and a fixed point called a fulcrum. There are 3 classes. |
| efficiency | the amount of work of a machine produces compared to how much work is applied. |
| compound machines | made up of two or more simple machines. |
screw,  | an inclined plane twisted in a spiral. Simple machine. |
| Compound machine. Levers, wheel and axle, screws |
 | compound |
