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Rotational doubt (also momentum)

  1. Dec 11, 2008 #1
    If a ball collides elastically with a stick at a point other than its centre of mass, then can we use coefficient of restitution is one or do we have to use initial kinetic energy = final kinetic energy??

    If we can't use "coefficient of restitution is one" then why???
  2. jcsd
  3. Dec 11, 2008 #2


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    Staff: Mentor

    According to the definition of an elastic collision, the total kinetic energy is conserved.
  4. Dec 11, 2008 #3
    so u r telling that we cant use coefficient of restitution as zero in this case??
  5. Dec 11, 2008 #4


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    Science Advisor

    You must mean one instead of zero.
    The COF will not be one if either object starts to rotate.
  6. Dec 12, 2008 #5
    Yeah i meant 1
    then what will be COR??
  7. Dec 12, 2008 #6

    Doc Al

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    Staff: Mentor

    Why not forget about COR and just apply conservation of linear momentum, angular momentum, and kinetic energy.
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