# Friction on Inclined Plane

1. Nov 5, 2011

### uhohphysics

1. The problem statement, all variables and given/known data
On Mountain roads, ramps of gravel are constructed to allow trucks that have lost their brakes to come to a stop. Suppose a 15,000kg truck hits one of these ramps at 35m/s. The incline of the ramp is 6 degrees and the coeffiecent of friction is 0.40.
By using work and energy it is asked to find the distance the truck travels along a ramp.

2. Relevant equations
U=m*g*h
K= 1/2 m*v2
W=F*d

3. The attempt at a solution

I calculated K to be -9187500 and U to be 147150*h
W= ΔK + ΔU
Then tired to use W=F*d cos6
But got stuck with that height.
I can't use trig fuctions to find my h because the distance is what im trying to find....

2. Nov 5, 2011

### jncarter

You can use trigonometry to solve for the distance. Recall that $d^{2} = x^{2} + h^{2}$ and that $x = d cos \theta$ $h = d sin \theta$ . Once you find either x or h you can solve for d.