Strength of Materials
Limiting force of friction is the

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

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Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
positive and negative couples can be balanced

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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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