First slide

Torque

Question

In Figure, a cubical block is held stationary against a rough wall by applying a force F, then the incorrect statement among the following is:

Moderate

A

frictional force f = mg
B

F = N, N is normal reaction
C

F does not apply any torque
D

N does not apply any torque

Solution

f = mg
F = N
For equilibrium F_net = 0 and $τ_{net} = 0$
For $τ_{net} = 0$ , N must apply torque.

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