Can 3 Force Members Be Collinear?

[pyroknife]

2 force members have to be collinear, is that the same way with 3 force members? Just a curious question.

 

[lewando]

For mechanical systems in static equilibrium, a 2-force member has collinear forces. A 2-force member can be in a state anywhere between tension and compression. A 3-force member is another animal.