# Hockey Puck with work done by friction.

## 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.

## The Attempt at a Solution

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Andrew Mason
Homework Helper

## 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.

## 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?