Exam-style question
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What is the condition for rotational equilibrium?.
- A.The net torque acting on the object is zero.
- B.The net force acting on the object is zero.
- C.The moment of inertia is constant.
- D.The angular velocity is constant.
Model answer
What a good answer should say
- The net torque acting on the object is zero.
Explanation
Why this works
For an object to be in rotational equilibrium, the sum of all torques acting on it must equal zero, meaning there is no net torque causing it to rotate.
Common mistake
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