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 ratio of the friction and the normal reaction
The angle between the normal reaction and the resultant of normal reaction and limiting friction

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The force of friction always acts in a direction opposite to that in which the body tends to move
The force of friction depends upon the roughness of the surface
The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction is dependent upon the area of contact

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Applied Mechanics and Graphic Statics
The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

Algebraic sum of the resolved parts of the forces in the direction
Difference of the forces multiplied by cosine θ°
Sum of the forces multiplied by the tangent θ°
Arithmetical sum of the resolved parts of the forces in the direction

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