Strength of Materials
The necessary condition for forces to be in equilibrium is that these should be

Meet at one point
Coplanar
All be equal
Coplanar & Meet at one point

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Strength of Materials
According to principle of moments

positive and negative couples can be balanced
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

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Strength of Materials
Kinetic 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 the limiting friction
Ratio of limiting friction and normal reaction
The friction force acting when the body is in motion

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Strength of Materials
Coefficient of friction is the

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

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