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Please explain what an axis of inertia or principle axis of inertia is! 
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#1
Jun2609, 01:59 PM

P: 529

I have confronted these terms in a paper about molecular quantum mechanics, and they are completely unfamiliar to me. Can someone help?



#2
Jun2609, 05:28 PM

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P: 26,157

Hi AxiomOfChoice!
Basically, a principal axis of a body is a direction along which the simple Iω and 1/2 Iω^{2} formulas work. All axes of rotational symmetry are principal axes, but other axes (usually) aren't (which is why things wobble ) … see the PF Library on moment of inertia for details 


#3
Jun3009, 06:21 AM

P: 36

Sounds like parallel axis theorem and moment of inertia to me. Used to find the inertia of things that are not point particals.



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