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Why is moment of inertia varyiing with the square of the radius?

  1. Aug 7, 2010 #1
    why is moment of inertia varyiing with the square of the radius???????

    hello,
    where ever i search moment of inertia on the web or on textbooks ,it starts with a definition saying that it is the product of mass the square of the radius.

    my question is why is moment of inertia defined like mass times square of the radius.
    if someone can help me to understand moment of inertia intutively please????????????
     
  2. jcsd
  3. Aug 7, 2010 #2

    rock.freak667

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    Re: why is moment of inertia varyiing with the square of the radius???????

    If you read the general principles section for moment of inertia (click on 'moment of inertia') in the PF library, they have a proof as to how they arrived at I= âˆĞr2 dm using an energy method.
     
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