Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Two resolved parts in any two directions at right angles are equal
Algebraic sum of the moments of the forces about the point is zero
Algebraic sum of the forces is zero
Sum of resolved parts in any two directions at right angles, are both zero

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

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

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