Give reasons why a lever always has efficiency less than 100percentage
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The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent. ... A: There would be less friction to overcome if you used a dolly because of the wheels.
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Machine Efficiency
The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent. The closer to 100 percent a machine's efficiency is, the better it is at reducing friction. Look at the ramp in the Figure below.
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