Strength of Materials
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

be all parallel
meet in a point
at least two of them must meet
All of the listed here

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Strength of Materials
Coefficient of friction is the

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

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