Strength of Materials
Coefficient of friction is the

the friction force acting when the body is in motion
ratio of limiting friction and normal reaction
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

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

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

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