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Question

A block and tackle system has 5 pulleys. If an effort of 1250 N is needed in the downward direction to raise a load of 5000 N calculate(a) M.A. (b) V.R.(c)efficiency of the system. Also find the magnitude of extra force needed to overcome the friction.

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Solution

Recall M.A=Load/effort=5000/1250=4
VR=number of pulley used=5
efficiency%=(MA/VR)100=(4/5)100=80% answer
extra force=5000-1250=3750N

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