Question

Output energy of a real life machine is always less than the input energy give two reason for this deficiency

Answer 1

Because some of the work input to a machine is always used to overcome friction, the work output of a machine is always less than the work input. The percentage of the work input that becomes work output is the efficiency of a machine.

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Answer 2

Answer:

Because some of the work input to a machine is always used to overcome friction, the work output of a machine is always less than the work input. The percentage of the work input that becomes work output is the efficiency of a machine.