| A | B |
|---|
| wedge | two inclined planes stuck back to back (It can hold something in place, raise an object, or split something apart (ex. axe). |
| lever | bar that moves on or around a fixed point. The fulcrum is between the force arm (effort) and the load arm (load). ex. sea saw |
| screw | an inclined plane wrapped around a cylinder. It is used to fasten two things together or make a hole (ex. top of bottle). |
| wheel and axle | has a larger wheel and an inner, smaller wheel. The larger wheel makes a circle around the axle (ex. pencil sharpener). |
| compound machine | severar simple machines put together (ex. scissors) |
| pulley | a rope over a wheel. It is used to move objects up and down or from side to side (ex. top of flagpole). |
| simple machine | tool that helps people do work. They do not change the amount of work; they just make the work easier. There are six different kinds. |
| inclined plane | a flat surface that is slanted to another surface. It can help you move objects to a higher or lower place more easily. |
