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Momentum conservation

  1. Feb 6, 2010 #1
    hi
    in rigid body questions are there cases where i should use moment conservation
    and not angular moment conservation or the opposite?

    when would i use which?
     
  2. jcsd
  3. Feb 6, 2010 #2
    Good question. Use momentum conservation only when there is no impulsive force on your assumed system, or a non-impulsive force for conservation over a long period of time.Angular momentum conservation holds as long as there is no torque about the point.

    Here's then a question for you. A rod hanging from a pivot is hit with a particle(inelastically).What would you use?
     
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