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

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

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Strength of Materials
Limiting force of friction is the

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

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