Applied Mechanics and Graphic Statics
The angle of friction is:

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

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Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

All of these
For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
The force of friction always acts in a direction opposite to that in which a body is moving

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of the moments of the forces about a point must be zero
Algebraic sum of vertical components of all the forces must be zero
All (A), (B) and (C)
Algebraic sum of horizontal components of all the forces must be zero

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