For a body to be in equilibrium, which condition must be satisfied?
AOnly the net force must be zero
BOnly the net moment must be zero
CBoth net force and net moment about any axis must be zero
DThe body must be moving with constant speed
Answer & Solution
Correct answer: C. Both net force and net moment about any axis must be zero
Equilibrium requires translational equilibrium ($\vec F_{\text{net}}=0$) and rotational equilibrium (net moment about any axis is zero). If either condition fails, the body can accelerate linearly or angularly.
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