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B Moment of inertia

  1. Dec 25, 2016 #1
    To find Moment of inertia, there are 2 rules:
    I = ∑m r2
    I= ∫ r2 dm

    I don't know when to use the first and when to use the second rule.
     
  2. jcsd
  3. Dec 25, 2016 #2

    Doc Al

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    Staff: Mentor

    The first is useful for point masses; the second, for continuous distributions of mass.
     
  4. Dec 25, 2016 #3
    what does continuous distributions of mass mean?
     
  5. Dec 25, 2016 #4

    Doc Al

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    Staff: Mentor

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