Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
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
positive and negative couples can be balanced

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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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