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: How to find the change in momentum

  1. Feb 8, 2014 #1
    1. The problem statement, all variables and given/known data

    a shunting locomotive strikes a wagon of mass 8t and sets it in motion with an initial speed of 3.6m/s.The wagon travels freely along a level track against a track resistance of 58N/t for 12s.determine;

    a.the frictional resistance(average force)
    b.the reduced velocity of the wagon after the 12s due to the track resistannce

    Please i need some one to help me figure out what to do first to start with this question..I'm not asking for answers,just want step by step procedure so i can get to understand this topic once and for all.:)

    2. Relevant equations

    struggling with how to find the change in momentum.:(

    3. The attempt at a solution
  2. jcsd
  3. Feb 8, 2014 #2


    User Avatar

    Staff: Mentor

    Hi small s. You don't have to use momentum here, but you can if you wish.

    F. Δt = m. Δv ...... is a good equation here.

    You know the frictional force acting on the moving wagon, and you are asked to determine its velocity after Δt of 12 seconds. So, go ahead. :smile:

    First, address question (a).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted