Strength of Materials
Kinetic friction is the

The friction force acting when the body is in motion
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction

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

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