Hockey Puck with work done by friction.

AI Thread Summary
A hockey puck with a mass of 0.25 kg is sliding at 60 m/s on ice with a friction coefficient of 0.03, which eventually brings it to a stop due to friction. The work done by friction can be determined without calculating the frictional force or the distance traveled. Instead, it is essential to consider the initial kinetic energy of the puck and how it converts to work done against friction until the puck stops. The discussion emphasizes understanding the relationship between energy and work in this context. Ultimately, the work done by friction equals the initial kinetic energy of the puck, leading to a complete stop.
blongmoua
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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

 
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blongmoua said:

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
 
So is it N=mg

F=umg

F=.03*.25*9.8?
 
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.
 
Another hint: what is the initial energy that the puck has? Why does that energy drop to zero?
 

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