Applied Mechanics and Graphic Statics
Force polygon method is applicable for

A system of parallel forces only
Any coplanar force system
Non-concurrent coplanar force system
Concurrent coplanar force system

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

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
For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
All of these

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