I keep getting “Moment of inertia” questions wrong in Rotational Motion. What's the trap?
treating it as a fixed property regardless of the axis chosen.
The usual trap: treating it as a fixed property regardless of the axis chosen. How to avoid it: mass far from the axis contributes much more (distance is squared). Go back to the definition — the rotational analogue of mass; it depends on both the mass and how it is distributed about the axis.
Key point
Moment of inertia
Common mistake
treating it as a fixed property regardless of the axis chosen.
Memory tip
mass far from the axis contributes much more (distance is squared).
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