Vocabulary #4(How Inclined Planes Work)

1. Inclined plane: a straight, slanted surface that is mot moved when use.

2. screw: a inclined plane wrapped around a central bar.

3. wedge: one or combination of 2 inclined planes.

4. compound machine: a combination of 2 or more simple machines.

5. efficiency: a ratio of work done by a machine compared with the work put in the machine.