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!

Calculating the change of momentum in a system

  1. Oct 18, 2011 #1
    1. The problem statement, all variables and given/known data

    A ball with momentum of 10 kg-m/s [E] hits an object and rebounds with momentum of 6 kg-m/s [W]. What was the change in momentum?

    2. Relevant equations

    delta p=p(final)-p(initial)

    3. The attempt at a solution

    delta p=p(final)-p(initial)
    delta p=(6 kg-m/s)-(10 kg-m/s)
    delta p= -4 kg-m/s

    This problem seems so simple, and yet it's in the middle of a worksheet full of really hard problems, so I just wanted to make sure I'm doing it right.
     
  2. jcsd
  3. Oct 19, 2011 #2
    I am assuming that impact is head on i.e. there are no angles involved.

    Do not forget that momentum is a VECTOR.
    Hence if to the RHS one takes it as positive, it must be taken as negative when it reverses direction.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Calculating the change of momentum in a system
Loading...