# Homework Help: Coefficient of Kinetic Friction

1. Nov 12, 2008

### daliberataaa!

1. The problem statement, all variables and given/known data
A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^2. Determine the coefficient of kinetic friction between the box and the ramp.

2. Relevant equations
μk=f sub k/Fn

3. The attempt at a solution

With the information I have, I have no samples in my physics book or anything. I ohnestly don't know where to start.

2. Nov 12, 2008

### jgens

I would start by drawing a free body diagram.

Edit: Fixed spelling

3. Nov 12, 2008

### daliberataaa!

Is there a mathematical solution though?

4. Nov 12, 2008

### daliberataaa!

What do I need to get to solve this? Do I need mass? Normal force? what?

k well...i have searched the glossary of my book, searched the internet since 3 pm.

Last edited: Nov 12, 2008
5. Nov 12, 2008

### jgens

Yes there is an analytical solution to the problem. Draw the free body diagram and write out the sum of the forces in both the x and y directions.