a pulley is a machine that is 100% efficient.
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A simple machine, such as a lever, pulley, or gear train, is "ideal" if the power input is equal to the power output of the device, which means there are no losses. In this case, the mechanical efficiency is 100%.
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no machine can be 100% efficient .
A 100% efficient is only an ideal machine it does not exist in real life .
neither a nor ever is a 100% efficient as some of the work is wasted in overcoming the friction of the parts of pulley system.
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