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Homework Help: Friction Force - Bullet hitting a sandbag

  1. Sep 28, 2012 #1
    1. The problem statement, all variables and given/known data
    A rifle bullet with a mass of 15.5 g traveling toward the right at 262 m/s strikes a large bag of sand and penetrates it to a depth of 24.2 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

    2. Relevant equations
    F⃗ net=ΣF⃗ =ma⃗, fkkN, [itex]\Sigma[/itex]F=n+f+mg=ma

    3. The attempt at a solution
    I have no idea where to start. I tried drawing a force diagram, but I can't figure out how to use my givens all in one equation.
  2. jcsd
  3. Sep 28, 2012 #2


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    A force diagram is a good place to start. Can you describe what you have so far or scan it in and post it?
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