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Homework Help: Pulling A block with Friction

  1. Feb 2, 2009 #1
    1. The problem statement, all variables and given/known data
    A 3.52 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=12.6N at an angle theta=31.0degrees above the horizontal. The floor has a coefficient of kinetic friction µk = 0.04, what is the magnitude of the frictional force on the block when the block is moving? There is a second part which is What is the magnitude of the acceleration of the block when friction is being considered? Although I think I am forgetting forumals or something. If someone can just send me along the right track I think I can figure it out. Thanks!

    m = 3.52
    F= 12.6
    Theta = 31 degrees
    µk = 0.04

    2. Relevant equations

    Sine and cosine functions.
    µkFn= fk

    3. The attempt at a solution

  2. jcsd
  3. Feb 2, 2009 #2


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    Homework Helper

    You mean you think you are missing F = ma?

    (Less of course the correction you will need to make for the retarding force of friction.)
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