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Homework Help: Dynamics of block with friction how to set up?

  1. Oct 7, 2007 #1
    1. The problem statement, all variables and given/known data
    a 2.0 kg wood box slides down a vertical wood wall while you push on it at a 45 degree angle. what magnitude of foce should you apply to cause the box to slide down at a constant speed? I know that Mk = .2 (wood on wood)

    2. Relevant equations

    3. The attempt at a solution

    I tried to solve it with setting the forces in the y direction. I keep getting it wrong. i said Fy=0=Fasin[tex]\vartheta[/tex] - 19.6 N then solved and got Fa = 27.71 N. however the answer is Fa = 23.1 N
  2. jcsd
  3. Oct 7, 2007 #2


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    Science Advisor
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    Gold Member

    You have to look at all forces in the y direction. You missed one. You're going to have to look for all forces in the x direction as well.
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