Applied Mechanics and Graphic Statics
The angle of friction is:

The ratio of the friction and the normal reaction
The force of friction at which the body is just about to move
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

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Applied Mechanics and Graphic Statics
Newton’s Law of Motion is:

Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
All listed here
To every action, there is always an equal and opposite reaction

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