Strength of Materials
Coulomb friction is the friction between

solids and liquids
two lubricated surfaces
bodies having relative motion
two dry surfaces

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Strength of Materials
Center of percussion is

point of suspension
the point of C.G.
the point of metacentre
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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Strength of Materials
According to Lami's theorem

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
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 will be in equilibrium

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