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Question

In the pulley system shown in the figure, the radii of the bigger and smaller pulleys are 2 m and 1 m respectively. Find the resultant torque at point O. (Take g=10 m/s2)


A
200 N-m
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B
100 N-m
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C
0 N-m
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D
50 N-m
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Solution

The correct option is C 0 N-m
As we know,
Torque =rF
Torque on smaller pulley =r(mg)
=1×(10×10)=100 N-m (clockwise)
Torque on bigger pulley =r(mg)
=2×(5×10)=100 N-m (anticlockwise)
Net torque on point O=τ1+τ2
=100+(100)
=0 N-m

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