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Homework Help: Did I do this physics problem right?

  1. May 28, 2010 #1
    Its not for homework, I just want to make sure I can do this.

    What is the value of the coefficient of friction between the box and the floor?
    A man pushes a box with a mass of 10kg at a constant velocity across the floor. he pushes with a constant force of 25N. What is the coefficient of friction value?

    F = ukN
    uk = F / N
    uk = (25) / ((10)(9.8))
    uk = 0.25
  2. jcsd
  3. May 28, 2010 #2
    You will need to know at what rate the box accelerates at in order to find the friction co-efficient.
  4. May 28, 2010 #3
    Not for this problem. If the velocity is constant, which the problem stated, then the net force is zero.

    So mgcosθμ = 25

    98μ = 25

    μ = .2551...

    so yes you're correct.
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