This is my FBD if that clears anything up at all. Ff is my Friction force, yes. I don't know Fn independent of Ff because there are three forces in the y direction.
@mfb I did solve for theta and got the right answer, 6.842773413 however I'm not sure on how to find r. Is my formula correct? What is the next step I need to take, in order to get read of my Forces?
Homework Statement
A civil engineer is asked to design a curved
section of roadway that meets the following
conditions:
With ice on the road, when the coefficient of
static friction between the road and rubber is 0.12, a car at rest must not slide into the ditch
and a car traveling less than 70...