Friction on Inclined Plane

  • #1

Homework Statement


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.


Homework Equations


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


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....
 

Answers and Replies

  • #2
49
0
You can use trigonometry to solve for the distance. Recall that [itex] d^{2} = x^{2} + h^{2} [/itex] and that [itex] x = d cos \theta[/itex] [itex]h = d sin \theta [/itex] . Once you find either x or h you can solve for d.
 

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