Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

At any point on the surface normal to the line of action of the force
At the centre of gravity of the body
On the periphery of the body
On any point on the line of action of the force

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Applied Mechanics and Graphic Statics
The angle of friction is:

The force of friction when the body is in motion
The force of friction at which the body is just about to move
The angle between the normal reaction and the resultant of normal reaction and limiting friction
The ratio of the friction and the normal reaction

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