Strength of Materials
The product of either force of couple with the arm of the couple is called

resulting couple
moment of the couple
resultant couple
moment of the forces

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

All of the listed here
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
reaction of any smooth surface with which the body is in contact

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