Strength of Materials
Two coplanar couples having equal and opposite moments

Balance each other
Produce a moment of couple
Are equivalent
Produce a couple and an unbalanced force

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Strength of Materials
In the equation of virtual work, following force is neglected

reaction of any smooth surface with which the body is in contact
reaction of a rough surface of a body which rolls on it without slipping
reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
All of the listed here

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Strength of Materials
The weight of a body is due to

force of attraction experienced by par-ticles
centripetal force of earth
gravitational pull exerted by the earth
gravitational force of attraction towards the centre of the earth.

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