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Homework Help: Relationship between Kinetic Energy and Linear Momentum.

  1. Apr 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Q.1 Describe a device which can have Kinetic Energy but no linear momentum.

    Q.2 Is it possible to invent a device with linear momentum and no kinetic energy.

    2. Relevant equations
    p = mv
    Ek = ½ mv²

    3. The attempt at a solution
    For a "device" to have no linear momentum p = 0, right? But if p = 0 wouldn't Ek just = 0? So would such a "device" be impossible and the answer to Q.2 is no it is not possible.
  2. jcsd
  3. Apr 23, 2012 #2
    How about rotation, with angular momentum
  4. Apr 23, 2012 #3
    Like this?
    Last edited by a moderator: Sep 25, 2014
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