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Q.

The net external torque on a system of particles about an axis is zero. Which of the following are compatible with it?
a) The forces may be acting radially from a point on the axis
b) The forces may be acting on the axis of rotation
c) The force may be acting parallel to the axis of rotation
d) The torque caused by some forces may be equal and opposite to that caused by other forces.

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a

all

b

b, c only

c

a, b only

d

a, d only

answer is D.

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Detailed Solution

If moment of a force about an axis is zero, then either the force is parallel to the axis or it will intersect the axis.

If more than one non-zero force act about an axis, then some forces produce clockwise moment and the other must produce anti-clock wise moment and the resultant moment must be zero.

 

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