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Hockey Puck with work done by friction.

  • Thread starter blongmoua
  • Start date
  • #1
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Homework Statement


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.



Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
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Homework Statement


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.



Homework Equations





The Attempt at a Solution

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
 
  • #3
2
0
So is it N=mg

F=umg

F=.03*.25*9.8?
 
  • #4
45
0
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.
 
  • #5
206
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Another hint: what is the initial energy that the puck has? Why does that energy drop to zero?
 

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