alleryStart learning →A system is displaced slightly from equilibrium and feels a net torque directed opposite to the displacement. What kind of equilibrium is it in?
ANeutral equilibrium
BStable equilibrium
CDynamic equilibrium
DUnstable equilibrium
Answer & Solution
Correct answer: B. Stable equilibrium
1. A restoring effect is one that pushes the body back toward where it started.
2. A net force or torque opposite to the displacement is exactly such a restoring effect.
3. That defines stable equilibrium, like a marble at the bottom of a bowl.
4. Unstable equilibrium is the reverse case, where the effect points along the displacement.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.3 Stability_
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