Vocabulary #4 (How inclined planes work)

Definitions:

1. inclined plane: a straight, slanted surface that is not moved when used
2. screw: an inclined plane wrapped around a central bar
3. wedge: one or a combination of two inclined planes that is moved when is used
4. compound machine: a combination of two or more machines
5. efficiency: a ratio of the work done by a machine compared with the work put into the machine

Sentences and illustrations:

1. A ramp is an example of an inclined plane.

2. An screw's  mechanical advantage is very high.

3. A wedge may have one or two slanted surfaces.

4. A pair of scissors is an example of a compound machine.

5. To calculate efficiency you need to make a radio.