Give two reasons why the efficiency of a single movable pulley system is not $100 %$ .

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Solution

Efficiency:
The efficiency of a machine or process is defined as the ratio of work done by the machine to the work done on the machine.
Single Movable Pulley:
A single movable pulley is a pulley with a rotating axis that is not fixed in place.
Two reasons why the efficiency of a single movable pulley system is not $100 %$ are:
Friction exists in the pulley bearings or at the axle.
The pulley and string do not have a zero weight.

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Give two reasons why the efficiency of a single movable pulley system is not 100%.

Give two reasons why the efficiency of a single movable pulley system is not $100 %$ .