Strength of Materials
Coulomb friction is the friction between

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

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Strength of Materials
In actual machines

mechanical advantage is greater than velocity ratio
mechanical advantage is equal to velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity

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

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