http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/imgmech/carbank.gif I had a problem in my textbook asking me to find the maximum velocity for a car turning on a banked curve. After i drew my freebody diagram i had the same formula for centripetal force as hyperphysics above (Fx). However when i tried getting my result my answer was wrong.... I didn't know what i was doing wrong so i searched hyperphyics and found their vmax formula turned incredibly different from mine. Then i saw that they had a second equation. I was able to finally figure out that they isolated for the normal force, n = mg/(costheta - usintheta) in Fy and substituted it into the Fx formula. BUT the value for the normal force is different from what i had before. I had n = mgcostheta Why couldn't i use that value for N in my version of Fx = Fcentripetal ? Thank you for your help.