Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

To replace them by a single force
Not a replace them by a single force
To replace them by a couple
To replace them by a single force through C.G.

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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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