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Forces and Laws of Motion

  1. Feb 8, 2015 #1
    1. The problem statement, all variables and given/known data
    A 225 kg crate rests on a surface that is inclined above the horizontal at an angle of 20o.
    A horizontal force (F = 535 N parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of friction between the crate and the incline?

    P.S. Ftr is a frictional force.

    image.jpg

    2. Relevant equations
    Newton's laws of motion.

    3. The attempt at a solution
    image.jpg
    image.jpg

    It doesn't work.
    The answer must be 0.665 .
     
  2. jcsd
  3. Feb 8, 2015 #2

    BvU

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    Funny. That's exactly what I get. What is ##\cos\alpha## on your calculator ?
     
  4. Feb 8, 2015 #3
    I missed one number xD. Sorry for wasting your time.
     
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