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Homework Help: Need help giving examples regarding momentum

  1. Nov 13, 2012 #1
    I need help thinking of examples for these 3 situations:

    1. an object with zero momentum that has a net force on it
    2. an object with downward momentum that is changing in the upward direction
    3. an object has a net force on it but no energy change

    Any help would be appreciated!
  2. jcsd
  3. Nov 14, 2012 #2

    Simon Bridge

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    Homework Helper

    Welcome to PF;
    A net force implies acceleration... but certainly a change in momentum.
    You have a bunch of equations to do with energy and momentum don't you? Try listing them and see if you notice anything.

    Taking them in order - hints:
    * you have an equation for momentum: under what circumstances is the momentum zero?
    * again from the equation - which part affects the direction? Which part has to change for the change to be in a different direction?
    * isn't there a special law to do with energy?
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