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Incomplete Momentum bar chart for collision

  1. Mar 23, 2013 #1
    1. The problem statement, all variables and given/known data
    The figure (Figure 1) is an incomplete momentum bar chart for a collision that lasts 15ms .

    Figure 1: http://session.masteringphysics.com/problemAsset/1384208/4/knight_Figure_09_06.jpg

    What is the magnitude of the average collision force exerted on the object?
    Express your answer to two significant figures and include the appropriate units.


    2. Relevant equations
    Pix+Jx=Pfx


    3. The attempt at a solution
    I've never seen a momentum bar chart before and we never learned anything like this in class.
    i tried -8N because 6-8=-2, but that was wrong
    How am I supposed to approach this problem?
     
  2. jcsd
  3. Mar 23, 2013 #2
    -8 is actually the magnitude of change in momentum. You must divide it by the time taken to get the average force.
     
  4. Mar 23, 2013 #3
    yes, that makes sense and it is correct.
    Thanks Sunil!
     
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