High Quality Content by WIKIPEDIA articles! In physics, mechanical efficiency is the effectiveness of a machine. Mechanical efficiency is the ratio of work output to work input. It is often expressed as a percentage. While the efficiency of an ideal machine is 100 percent, an actual machine's efficiency will always be less than 100% because of the second law of thermodynamics, which states that the quality of energy will decay, eventually becoming heat. This means that some of the work put into the system is transformed into thermal energy. In a mechanical system, friction is the most common means by which work is lost to heat. The actual mechanical advantage of a system is always less than the ideal mechanical advantage due to these losses. Another way to express mechanical efficiency is it is the ratio of actual mechanical advantage to ideal mechanical advantage.

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