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

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

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Strength of Materials
Coefficient of friction is the

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

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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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