ICSE Class 10 Physics 2017 Solved Paper

Question : 25 of 65

Marks: +1, -0

A boy uses a single fixed pulley to lift a load of

50 {\kgf}

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

=50 {\kgf}

For a single fixed pulley in ideal case, M.A.

=1

\; ∵ \;\text " M.A. "\;=\;{\;\text " Load "\;}/{\;\text " Effort "\;}

\text " or "\; \;\text " Effort "\;=\;{\;\text " Load "\;}/{\;\text " M.A. "\;}

=\;{50 {\kgf}}/{1}=50 {\kgf}

For a single movable pulley in ideal case, M.A.

=2

∴ \;\; \;\text " Effort "\;=\;{\;\text " Load "\;}/{\;\text " M.A. "\;}

=\;{50 {\kgf}}/{2}=25 {\kgf} \;\text ". "\;

∴

Ratio of effort by a single fixed pulley : Effort applied by a single movable pulley

\;=50 {\kgf}: 25 {\kfg} .

\;=2: 1

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