Simple Machine Definition

noun
Any of the basic mechanical devices, including the lever, wheel and axle, pulley, wedge, screw, and inclined plane, one or more of which are essential to any more complex machine.
Webster's New World

(physics) A device that only requires the application of a single force to work.

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Synonyms:

Other Word Forms of Simple Machine

Noun

Singular:
simple machine
Plural:
simple-machines

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simple machine