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: Average force in a collision problem

  1. Nov 14, 2007 #1
    1. The problem statement, all variables and given/known data

    A 59.8kg ice skater, moving at 14 m/s crashes into a stationary skater of equal mass. After the collision, the two skaters move as a unit at 7 m/s. Suppose the average force a skater can experience without breaking a bone is 4640N. If the impact time is 0.047s, what is the magnitude of the average force each skate experiences?

    2. Relevant equations

    impulse = change in momentum
    change in momentum= m(Vf-Vi)
    impulse=Faverage(change in time)

    3. The attempt at a solution

    Honestly, I'm not sure where to begin but I'll give it my best shot...

    I'm going to try this

    impulse = Faverage(change in time)

    so impulse = 4640N (.047s) = 218.08 ...I don't think thats anywhere near what this problem is asking for though...
  2. jcsd
  3. Nov 15, 2007 #2

    Shooting Star

    User Avatar
    Homework Helper

    The change in momentum of the 1st skater is known, which is equal to impulse = Fav x time. Then you can find Fav.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook