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Homework Help: Hockey Puck with work done by friction.

  1. Mar 18, 2010 #1
    1. The problem statement, all variables and given/known data
    A hockey puck with a mass of .25kg is sliding along a slippery frozen lake with an initial speed of 60 m/s. Coefficient of friction between the ice and the puck is .03. Friction eventually causes the puck to slide to a stop. What is the work done by friction.



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 19, 2010 #2

    Andrew Mason

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    Homework Helper

    What have you done so far? Hint: the solution does not require you to find the force of friction or the distance over which it applies.

    AM
     
  4. Mar 19, 2010 #3
    So is it N=mg

    F=umg

    F=.03*.25*9.8?
     
  5. Mar 19, 2010 #4
    think about what work is defined as. this might give you a clue to solving. other poster is right, you don't need to work out frictional force.
     
  6. Mar 19, 2010 #5
    Another hint: what is the initial energy that the puck has? Why does that energy drop to zero?
     
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