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ICSE Class 10 Physics 2017 Solved Paper

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Question : 25
Total: 65
A boy uses a single fixed pulley to lift a load of 50‌kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.
Solution:  
Given : Load =50‌kgf
For a single fixed pulley in ideal case, M.A. =1
‌∵‌ M.A. ‌=‌
‌ Load ‌
‌ Effort ‌
or ‌‌ Effort ‌=‌
‌ Load ‌
‌ M.A. ‌
 =‌
50‌kgf
1
=50‌kgf
For a single movable pulley in ideal case, M.A. =2
∴‌‌‌ Effort ‌=‌
‌ Load ‌
‌ M.A. ‌
 =‌
50‌kgf
2
=25‌kgf‌. ‌
∴ Ratio of effort by a single fixed pulley : Effort applied by a single movable pulley
‌=50‌kgf:25‌kfg.
‌=2:1
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