Strength of Materials
Coulomb friction is the friction between

solids and liquids
two dry surfaces
bodies having relative motion
two lubricated surfaces

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

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 any smooth surface with which the body is in contact
reaction of a rough surface of a body which rolls on it without slipping

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