1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    Science Advisor
    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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook