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For equilibrium of a rigid body in 2D, the conditions are:
AJust moment
BΣF≠0
CΣF = 0
DΣFx = 0, ΣFy = 0, and ΣM = 0 (3 equations)
Answer & Solution
Correct answer: D. ΣFx = 0, ΣFy = 0, and ΣM = 0 (3 equations)
Static equilibrium in 2D: 3 independent equations — sum of forces in x = 0, sum of forces in y = 0, sum of moments about any point = 0. Allows solving structures with up to 3 unknown reactions (statically determinate).
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