# Finding the coefficient of kinetic friction

1. Oct 14, 2008

### physics_fool

1. The problem statement, all variables and given/known data

A 50 kg block slides down a 32° ramp with an acceleration of 3.2 m/s2.
What is the coefficient of kinetic friction between the block and the ramp?

2. Relevant equations
$$\mu$$kinetic=$$\frac{f_{kinetic}}{F_{normal}}$$

3. The attempt at a solution

I have gone through many attempts, but all of them just don't seem right...could someone please explain it plain and simple?

2. Oct 14, 2008

### nicksauce

Hi physics_fool, welcome to PF. The usual algorithm for solving such problems is:

1) Draw a free body diagram, identifying the forces. There should be weight, friction, and normal force.
2) Use Newton's second law, F=ma, to find the force of friction
3) Use Force of friction / Normal Force = coefficient of friction

So what are the components of the forces in each direction?

3. Oct 14, 2008

### physics_fool

That's the question as it was given...

but for your second question, isn't that to find the net force...not the force of friction?

4. Oct 15, 2008

### physics_fool

Ok...nvm. I got it...thanks anyways