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

reaction of a rough surface of a body which rolls on it without slipping
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

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Strength of Materials
The weight of a body is due to

gravitational pull exerted by the earth
force of attraction experienced by par-ticles
centripetal force of earth
gravitational force of attraction towards the centre of the earth.

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Strength of Materials
In actual machines

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

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