Strength of Materials
Coefficient of friction is the

angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction
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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Strength of Materials
Center of percussion is

point of suspension
the point of metacentre
the point of C.G.
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 principle of transmissibility of forces, the effect of a force upon a body is

Minimum when it acts at the C.G. of the body
Different at different points in its line of action
Maximum when it acts at the center of gravity of a body
The same at every point in its line of action

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