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

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

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

All of the listed here
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

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