Statics › Section E · Rigid body equilibrium › Topic E.6
Stability and determinacy
Before solving for reactions, ask two questions: will the supports actually hold the body still, and can statics alone find every reaction? Counting unknowns answers part of each, and checking how the supports are arranged answers the rest.
In this topic
- Two questions before solving
- Determinate and indeterminate
- Stable and unstable
- Two ways the count can lie
- The three checks
- Worked example: classifying supports
- Worked example: a propped cantilever
- Why build indeterminate structures
- Stability in 3D
- Common mistakes to avoid
- Key takeaways
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