Strength of Materials
Pick up wrong statement about friction force for dry surfaces. Friction force is

proportional to velocity of sliding
dependent on the materials of contact surface
proportional to normal load between the surfaces
independent of the area of contact surfaces

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Strength of Materials
Center of percussion is

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
the point of C.G.
point of suspension

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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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