Strength of Materials
According to Lami's theorem

Three forces acting at a point will be in equilibrium
If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
Three forces acting at a point can be represented by a triangle, each side being proportional to force
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

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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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