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Rolling things

  1. Sep 17, 2005 #1
    i know that the equation for rotational inertia of a hoop is different than the equation for a solid cylinder, but what is the equation for a rectangular cube in a hoop?
    _
    \ ->
    \ (|) <--is what I mean if the diagram helps at all
    <-
     
  2. jcsd
  3. Sep 17, 2005 #2

    Doc Al

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    Staff: Mentor

    I have no idea what that diagram is supposed to show, but the rotational inertia of a compound object is just the sum of the rotational inertias of each component. The rotational inertia of a cube of side s about an axis perpendicular to a face and passing through its center of mass is: [itex]1/6 m s^2[/itex]
     
  4. Sep 18, 2005 #3
    What do you mean by the term 'rectangular cube'?
     
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