State two reasons, why the efficiency of a pulley system is not 100 per cent?

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asked Dec 6, 2018 in Class X Science by navnit40 (-1,142 points)

State two reasons, why the efficiency of a pulley system is not 100 per cent?

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answered Dec 6, 2018 by priya12 (-10,179 points)

The two reasons are:

(i) Some effort is used (or wasted) in overcoming friction between the string and the grooves of the pulleys.

(ii) Some effort is used up (wasted) in lifting up the movable block alongwith the load.
On account of the above two reasons, effort applied is always more than the load lifted up and so the M.A. is always less then 1. Hence efficiency is always less than 100%.

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