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Homework Help: Please,help with energy and momentum conservation

  1. Apr 19, 2005 #1
    I got a conceptual doubt:Momentum(linear) conservation doesnt depend on conservation of kinetic energy.But,is the opposite true?Can kinetic energy be conserved without the conservation of momentum?

  2. jcsd
  3. Apr 19, 2005 #2


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    Yes, the typical example is a particle which only experiences CENTRIPETAL acceleration from some force (with centripetal acceleration, I mean that the acceleration is orthogonal to the velocity at all times) .
    The vector quantity momentum changes continually, yet the particle's SPEED, and hence, its kinetic energy remains conseved.
    Last edited: Apr 19, 2005
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