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

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

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

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