Statics › Section E · Rigid body equilibrium › Topic E.5
3D rigid body equilibrium
Signs on brackets, plates hung from cables and booms braced to walls all need the full six equations of equilibrium. The ideas are the same as in 2D; what changes is that forces and moments are handled as vectors.
In this topic
- Why go to three dimensions
- Six equations in vector form
- A method for 3D problems
- Worked example: a plate on three cables
- Worked example: a fixed sign arm
- Worked example: a boom and two cables
- Why the boom has five unknowns
- Available but not engaged in 3D
- Solving with linear algebra
- Common mistakes to avoid
- Key takeaways
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