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In physics, a simple machine is any device that only requires the application of a single force to work.

The traditional list of simple machines is:

* The inclined plane (N)
* The wheel and axle (O)
* The lever (T)
* The pulley (U)
* The wedge (V [single wedge]; X [double wedge])
* The Archimedes' screw (Y)

(The letters are a mnemonic, because their shapes resemble the shapes of the simple machines.)