Vocabulary 4
Inclined Plane: a straight,slanted surface that is not moved when it is used.
Screw: an inclined plane wapped around a central bar.
Wedge: one or a combination of two inclined planes that is moved when used.
Compound machine: a combination of two or more simple machines.
Efficiency: a ratio of the work done by a machine compered with the work put into the machine.
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