Define input energy and output energy.

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Solution

Input energy is defined as the work done on a machine.
Output energy is defined as the work done by a machine.
If we apply force on one end of a lever and the load is lifted from another end, the work done by us is input energy and the work done by the lever to lift the load is output energy.

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The output energy is always greater than the input energy.

State whether in actual machines, the output energy is greater or lesser than input energy. Give reason.

The output energy of a real-life machine is less than input energy because of :

The ratio between the input energy to the output energy of a machine is called its efficiency.

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