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

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Strength of Materials
Which one of the following statements is not correct

the angle of repose is equal to angle of friction
the sine of the angle of repose is equal to coefficient to friction
the tangent of the angle of friction is equal to coefficient of friction
the tangent of the angle of repose is equal to coefficient of friction

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Strength of Materials
Kinetic friction is the

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

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