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The ___________ forces do not cause the rotation.

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The ___________ forces do not cause the rotation.

(a) Non-concurrent

(b) Concurrent

(c) Parallel

(d) Non-Parallel

This question was addressed to me in semester exam.

Query is from Moment of a Force topic in chapter Force System Resultants of Engineering Mechanics

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The correct choice is (b) Concurrent

The explanation is: The concurrent forces are the which are somewhere touching the axis of rotation. If any of the force is touching that axis, that force is not considered or is insufficient to cause a rotation. If a force is concurrent then the perpendicular distance of the force from the line of an axis is zero, thus no rotation. As we know rotation is caused by a moment.

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