1. Mar 18, 2010 #1

   blongmoua

   

   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

    

   blongmoua, Mar 18, 2010
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3. Mar 19, 2010 #2

   Andrew Mason

   

   Science Advisor

   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

    

   Andrew Mason, Mar 19, 2010
4. Mar 19, 2010 #3

   blongmoua

   

   So is it N=mg
   
   F=umg
   
   F=.03*.25*9.8?

    

   blongmoua, Mar 19, 2010
5. Mar 19, 2010 #4

   iloveannaw

   

   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.

    

   iloveannaw, Mar 19, 2010
6. Mar 19, 2010 #5

   mathman44

   

   Another hint: what is the initial energy that the puck has? Why does that energy drop to zero?

    

   mathman44, Mar 19, 2010

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