Simple-machine meaning

The definition of a simple machine is a basic mechanical device.

An example of a simple machine is a pulley.

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(physics) A device that only requires the application of a single force to work.
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Any of numerous basic devices that alter the magnitude or direction, or both, of an applied force, traditionally including the lever, wedge, inclined plane, wheel and axle, pulley, and screw.
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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.
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