First slide

Questions using constraints

Question

In the figure shown, a person wants to raise a block lying on the ground to a height h. In both the cases, if time required is the same, then in which case, he has to exert more force. (Assume pulleys and strings are light)

Moderate

A

(i)
B

(ii)
C

Same in both
D

Cannot be determined

Solution

In first case,
In second case,
$∴$ In first case, person will have to apply more force.

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