Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Circular motion of rigid body

  1. Nov 19, 2008 #1
    When considering pure rotation of a rigid body about some point , then can we always consider the body to be concentrated in its centre of mass and use all force related equation treating it like a point object situated at it center of mass.? Why? Can anyone prove mathematically because there are many things like moment of inertia ,for e.g, for which we cannot do that.
  2. jcsd
  3. Nov 19, 2008 #2
    BUMP please I really need this in a few hours.
  4. Nov 19, 2008 #3

    Doc Al

    User Avatar

    Staff: Mentor

    I'm not sure I understand your question. If you're asking whether Newton's 2nd law for translation applies--sure:

    [tex]\Sigma F = ma_{cm}[/tex]

    If that's not what you mean, please give a specific example of your concern.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook