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!

Average Force of Impulse?

  1. Oct 31, 2009 #1
    I can't seem to master this equation, because I think I'm doing things right and I'm not.

    1. The problem statement, all variables and given/known data
    When a 410 baseball gram is hit, its velocity changes from +28.87 m/s to -22.34 m/s. The baseball is in contact with the bat for 56.10 milliseconds. You may assume that the balls outward velocity is antiparallel to its incoming velocity.

    What is the magnitude of the average force on the ball?


    2. Relevant equations
    FΔt = mΔv


    3. The attempt at a solution
    (0.410 kg)(-22.34 m/s - 28.87 m/s)/(0.0561 s) = F
    374.3 N = F
    But this isn't correct.

    I messed up Δv before, did I do it again?
     
  2. jcsd
  3. Oct 31, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks OK to me. Why do you say it's wrong?
     
  4. Oct 31, 2009 #3
    It's an online pre-assignment, said my answer was incorrect. I tried playing around with sig figs and signs (in case the question forgot it's supposed to be magnitude), but I've tried 5 times and haven't been able to get it correct.
     
  5. Oct 31, 2009 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Those online systems can be flaky. But there's nothing wrong with your understanding of that impulse-momentum equation.
     
  6. Oct 31, 2009 #5
    That's definitely true, thanks! I for sure trust your physics judgment over the program's.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Average Force of Impulse?
  1. Impulse Average Force (Replies: 3)

Loading...