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A Playground Slide and Some Friction

  1. May 20, 2007 #1
    A child goes down a playground slide that is inclined at an angle of 28.0° below the horizontal. Find the acceleration of the child given that the coefficient of kinetic friction between the child and the slide is 0.415

    Heres what I have so Far:
    F - fk = ma
    mgsin0 - MkN = ma
    mgsin0 - Mkmgcos0 = ma
    gsin0 - mkcos0 = a

    so by this,

    a = 9.8sin28 - .415cos28
    = 4.2343

    I cannot figure out what I am doing wrong here


    thanks friends
     
  2. jcsd
  3. May 20, 2007 #2

    hage567

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    Homework Helper

    There should be a g in there. You dropped it somewhere along the way.
     
  4. May 20, 2007 #3
    So, just because it is my last submission on this problem the answer should then be:

    a = (9.8sin28) - (9.8 x .415 cos28)

    such a stupid mistake...thanks
     
  5. May 20, 2007 #4

    hage567

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    Homework Helper

    Seems reasonable to me.
     
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