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Point Mass and Extended Objects

  1. Oct 21, 2007 #1
    I'm afraid that I do not quite understand the difference between a point mass object and an extended object. The only definition that I have is that an extended object has a definite, finite size and shape. That doesn't tell me very much...

    If someone could please tell me the difference between these two objects, I would greatly appreciate it. ^_^
  2. jcsd
  3. Oct 21, 2007 #2


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    The configuration of
    a point particle is described by its position in space...
    a rigid extended object is described by the position of its center of mass and its orientation.

    Think "degrees of freedom".
    Last edited: Oct 21, 2007
  4. Oct 21, 2007 #3
    ah, I get it now. Thank you.
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