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Homework Help: Coefficient of friction question, help please!

  1. Nov 21, 2008 #1
    1. The problem statement, all variables and given/known data

    1. A childs slide is straight and inclined at 25o to the horizontal. Matthew of mass 35kg goes down the slide at a constant speed.

    (a) draw a diagram
    (b) find the magintude of normal reaction force between matt and slide.
    (c) Find the coefficient of friction between matt and the slide

    part (a) and (b) are fine i got 311N for part (b) but couldnt find (c)

    2. Relevant equations

    F = MA
    F = ,U (mew) x R

    3. The attempt at a solution

    Resolved it in direction of friction got;

    Fr - 35gsin25 = 35a
    could not do this as had two unknowns
    same with
    F = mew x 311 and F = 35a

    any help would be greatly appreciated!
  2. jcsd
  3. Nov 21, 2008 #2


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    Science Advisor
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    Gold Member

    What does that imply about the value of the acceleration?
  4. Nov 22, 2008 #3
    it implies that the acceleration is zero, i see now, thanks very much for your help :)
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