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# Moment-of-inertia

Stuff is “tough” to move around. We called this inertia earlier.1

• “Throwing toughness”, or we could say linear inertia,2 when throwing a heavy stone or so, we called mass.
• Stuff can also be tough to spin or rotate, like a heavy flywheel. What should we call such “rotational toughness”, or angular inertia?

We could call it ‘angular mass’, and many would simply not call it anything but keep saying ‘inertial mass’.[1,2] But in scientific circles it is most commonly called moment-of-inertia.3 Let’s give it the symbol $I$.4

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