Engineering Mechanics
Angle of friction is the

The ratio of minimum friction force to friction force acting when the body is in motion
The ratio of minimum friction force to the friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
Angle between normal reaction and the resultant of normal reaction and the limiting friction

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Different at different points on its line of action
Minimum, if it acts at the center of gravity of the body
Maximum, if it acts at the center of gravity of the body
Same at every point on its line of action

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