Statics Practically,there exists many force systems in which the action lines of the forces are not coplanar these are force systems in space They are the most general force systems Diagram(a)is a concurrent forces system in space Diagram(b)is an arbitrary force system in space, if neglecting the forces of the wind from the side it is a parallel force system in space The force of wind fren the front The force of(o P wind from the side (b)3 Practically, there exists many force systems in which the action lines of the forces are not coplanar, these are force systems in space. They are the most general force systems. Diagram (a) is a concurrent forces system in space. Diagram (b) is an arbitrary force system in space, if neglecting the forces of the wind from the side it is a parallel force system in space. The force of wind from the front The force of wind from the side b