First slide

Torque

Question

Forces are applied on a wheel of radius 20 cm as shown in the figure. The torque produced by the forces 8 N at A, 8 N at E, 6 N at C and 9 N at D at angles indicated is

Moderate

A

5.4 N-m anti-clockwise
B

1.0 N-m clockwise
C

2.0 N-m clockwise
D

3.6 N-m clockwise

Solution

Force 8 N can also be resolved in tangential and radial directions.
$τ_{net} = (9 + 8 \sin 30 ° - 8) (0.2) N -m clockwise$
= 1.0 N-m clockwise

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