This engineering statics tutorial explains what two force members are and how they can be used to solve frames, machines, and truss problems. Basically, if a member that’s in static equilibrium only has two forces acting on it, the lines of actions of those forces must be the same, and they must have equal and opposite magnitudes. Anything else would result in an imbalanced force, and the member would begin to accelerate in some direction.
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Looking for software? I highly recommend checking out SkyCiv. They make a full suite of online structural analysis software and tools that are useful for both students and professionals, including calculators for beams, trusses, frames, moment of inertia and more. It’s great for checking your work:
https://bit.ly/skyciv-e4f
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