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Rigid body dynamics

  1. May 31, 2012 #1
    under what conditions can a rigid body collision problem be solved using a system approach, (i.e by using the conservation of angular momentum of the two rigid bodies about some point)
    the equation M=d[H]/dt is only valid when M and H are taken about a point fixed in a massless extension of a rigid body or its mass center. Yet for two-body collision problems, I have seen the total angular momentum being conserved about some point,( say, if a ball collides with a rod, then the cg of the rod).Is this approach valid?
     
  2. jcsd
  3. May 31, 2012 #2

    tiny-tim

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    welcome to pf!

    hi anandvineet27! welcome to pf! :smile:

    torque = rate of change of angular momentum (τ = dL/dt) is valid about any axis :wink:

    (however, τ = Iα is valid only for an axis through the centre of mass or centre of rotation)
     
  4. May 31, 2012 #3
    only valid about axes fixed in an inertial space.
     
  5. May 31, 2012 #4

    tiny-tim

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