The ___________ forces do not cause the rotation/rolling of the body if the rotation is considered in about the axis of the body or the centroid axis of the body.

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The ___________ forces do not cause the rotation/rolling of the body if the rotation is considered in about the axis of the body or the centroid axis of the body.

(a) Non-concurrent

(b) Concurrent

(c) Parallel

(d) Non-Parallel

This question was addressed to me during an interview.

The doubt is from Rolling Resistance in portion Friction of Engineering Mechanics

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The correct answer is (b) Concurrent

The best I can explain: 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 axis is zero, thus no rotation. As we know rotation is caused by a moment.

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