- #1
hanlon
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Homework Statement
A curve of radius 68m is banked for a design speed of 85km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve?
Homework Equations
1) FNsin(theta) = m*v2/r
2) FNcos(theta) - mg = 0
3) tan(theta) = v2/rg
The Attempt at a Solution
I used the third equation to find (theta) which is 39.9o
but I can't find out how to find Ffr or the range of velocity
I understand that when the car goes slow the frictional force faces up the banked curve and when it goes fast the friction goes down the banked curve but I can't figure out how to solve the question.