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Angular momentum

  1. Apr 24, 2006 #1
    I have two formulas to find angular momentum, and I am not sure when to use one and when to use the other, or what the difference is between the two. One is L = r x p, and the other is L=Iw.
  2. jcsd
  3. Apr 24, 2006 #2


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    The former is used for a the angular momentum of point particle about some point, while the latter is used for the angular momentum of an object rotating about a fixed axis.
    Last edited: Apr 24, 2006
  4. Apr 24, 2006 #3
    ok, I understand now. Thanks
  5. Apr 24, 2006 #4
    so, if it's a rod, for example, rotating about one of its ends, I should use L=Iw?
  6. Apr 24, 2006 #5


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    Given that a rod is not a point particle, yes.

    Just be careful to note that the moment of inertia (I) you are using is for that object about the given axis.
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