For the pulley simple machine shows how to calculate the input and output distances, the input and output forces and mechanical advantage.

A simple machine is a mechanical device that changes the direction and the magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term refers to the six classical simple machines that were defined by Renaissance scientists: the lever, the wheel and axel, the inclined, the screw, the wedge and the pulley. Simple machines do not make work easier, less input force may be needed but the force must be applied over a longer distance.

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