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Flip to reveal answersWhat are the two conditions for equilibrium?
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All 4 Flashcards — Force diagrams
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Question
What are the two conditions for equilibrium?
Answer
The forces balance — up equals down — and the moments about any point balance. Both must hold.
Question
How do you find an unequal pair of reactions?
Answer
Take moments about one support so its reaction drops out, solve for the other, then use up-equals-down to find the first.
Question
How does a force diagram show tension and compression?
Answer
Arrows pointing away from each other along a member mean tension; arrows pointing towards each other mean compression.
Question
What must be checked on a compression member?
Answer
Buckling, not just crushing. A slender member goes unstable sideways well below its crushing strength, and effective length decides it.
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Topic 7.2 hub
Structural systems applied
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