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

0 votes
1 view
asked Dec 6 in Class X Science by navnit40 (-1,119 points)

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

Please log in or register to answer this question.

1 Answer

0 votes
answered Dec 6 by priya12 (-10,126 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%.

Related questions

0 votes
1 answer
...