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Homework Help: Coefficient Of Kinetic Friction

  1. Feb 10, 2010 #1
    A hockey puck on a frozen pond is given an initial speed of 20.0 m/s. If the puck always
    remains on the ice and slides 115 min before coming to rest, determine the coefficient of
    kinetic friction between the puck and ice.




    [v = u + a*t
    => 0 = 20 - a* 115*60
    => a = 20/(115*60)

    v^2 - u^2 = 2*a*S
    => S = 400*(115*60)/2*20



    (1/2)*m*v^2 = u*m*g*S
    => u = (1/2)*v^2/S*g
    => u = (1/2) * 400/S*9.8

    I use these equations and I can't seem to come up with right answer
     
  2. jcsd
  3. Feb 10, 2010 #2

    rock.freak667

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    Homework Helper

    This should give the correct answer.

    1/2mv2=μmg(115)
     
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