mechanical advantage

mechanical advantage
the ratio of output force to the input force applied to a mechanism.
[1890-95]

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Force-amplifying effectiveness of a simple machine (lever, wedge, wheel and axle, pulley, or screw).

The theoretical mechanical advantage of a system is the ratio of the force that performs the useful work to the force applied, assuming there is no friction in the system. In practice, the actual mechanical advantage will be less than the theoretical value by an amount determined by the amount of friction.

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      force-amplifying effectiveness of a simple machine, such as a lever, an inclined plane, a wedge, a wheel and axle, a pulley system, or a jackscrew. The theoretical mechanical advantage of a system is the ratio of the force that performs the useful work to the force applied, assuming there is no friction in the system. In practice, the actual mechanical advantage will be less than the theoretical value by an amount determined by the amount of friction.

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Universalium. 2010.

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