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Old Oct 22nd 2008, 02:47 PM   #1
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Parallel axis theorem

Hey.
I have a question, in the Parallel axis theorem, what's M?
Lets take for example a full circle, I know that the moment of inertia is 1/2MR^2.
I saw in a question (the solution), that the moment of inertia on every point on the perimeter of the circle is MR^2 + 1/2MR^2 and that got me confuse, I mean I understand the 1/2MR^2 but why should it be MR^2, to be more exact, why should it be M, shouldn't it be like delta m, I mean, like only a particle on the perimeter of the circle?
10x.
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