# Finding Friction

1. Nov 3, 2007

### missashley

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

A 37 kg box slides down a 35 degree ramp with an acceleration of 1.35 m/s^2. The acceleration of gravity is 9.81 m/s^2.

Find the coefficient of kinetic friction between the box and the ramp.

2. Relevant equations

Ff= MkFn
Finding X and Y components of Fg

3. The attempt at a solution

Fg = 37 * 9.81 = 362.97 N
Fgx = 362.97 sin 35 = 208.1910391
Fgy = 362.97 cos 35 = 297.3276175

Fn = Fgy

F = ma
F = 37 * 1.35 = 49.95

49.95 / 297.3276175 = 0.167996 <~coefficient of kinetic friction

Did I do this right? What did I do wrong?

I think I did something wrong because the coefficient is greater than one

Please check what I did wrong and how can I fix it?

2. Nov 3, 2007

### Sourabh N

This is wrong. You can find the frictional force from known data and
$$\mu$$ = F$$_{fric}$$ / F$$_{normal}$$

3. Nov 3, 2007