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As the free body diagram of the problem statement involves the use of forces. So in them the ___________ forces do not cause the rotation.

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As the free body diagram of the problem statement involves the use of forces. So in them the ___________ forces do not cause the rotation.

(a) Non-concurrent

(b) Concurrent

(c) Parallel

(d) Non-Parallel

I have been asked this question in an internship interview.

Question is from Problems Involving Dry Friction topic in chapter Friction of Engineering Mechanics

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Correct option is (b) Concurrent

Best explanation: The concurrent forces are the one 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 the axis is zero, thus no rotation. As we know rotation is caused by a moment.

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