why is perfect machine not possible in the real life
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A machine whose efficiency is 100% is practically impossible to make as a 100% efficient machine has 0 mass and has 0 friction between its parts, which is impossible to achieve
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In practice however no machine is perfect because some part of the work done on a machine is always used up or wasted in overcoming the friction between the moving parts of the machine. If a machine is 80% of the work input to the machine is obtained as the useful work output. ...
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