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A skater's moment of inertia is measured about which axis?
AThe vertical wall
BThe ice surface
CHer spin axis
DThe rink's edge
Answer & Solution
Correct answer: C. Her spin axis
1. Moment of inertia is always quoted about a stated axis.
2. Angular acceleration depends on angular velocity and moment of inertia.
3. That moment of inertia is measured about a specific axis.
4. It is her moment of inertia about her spin axis.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 10 'Rotational Motion and Angular Momentum', sections 10.1-10.7_
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