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We often determine the work done by the couples. A couple moment is developed when _______ of the attached member is prevented.

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We often determine the work done by the couples. A couple moment is developed when _______ of the attached member is prevented.

(a) Translation

(b) Rotation

(c) Addition

(d) Subtraction

The question was asked during a job interview.

My question comes from Work in chapter Principle of Virtual Work of Engineering Mechanics

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The correct option is (b) Rotation

Easy explanation: The development of the couple moment is when there is prevention of the rotation of the attached member. This is the basic condition for the equilibrium of the couple moments in any dimension. This rule is applied when the couple moments are taken into the account for the equilibrium of the body.

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