# What is the kinetic friction coefficient?

Kailee

## Homework Statement

A skier is sliding down a 20o slope at constant speed, what is the kinetic friction coefficient?

E = 1/2 mv2
W = Fd
F = ma
F = μN = μmg

## The Attempt at a Solution

Attempted to use ma = μmgsin20, which crosses out the masses since mass was not given, but the skier is going at a constant speed so I'm assuming acceleration would be zero. Though I'm not sure how to continue the question or if I'm on the right track. Thanks in advance!

## Answers and Replies

brainpushups
Have you tried drawing a force diagram? If not, start here. You'll notice that your expression for the force of friction is incorrect (the μmg part), and that you have left out a force along the slope (the component of a force to be more specific)

You are correct that the acceleration would be zero.

Kailee
Ah, figured out what I was doing wrong, thank you! :)

siddharth23
You're right, the acceleration is zero. But you are missing one force. Why don't draw an FBD of the skier on the incline.