1. The problem statement, all variables and given/known data A 1200kg car rounds a dry curve (μ= .6)with a radius of 67 m banked at an angle of 12°. If the car is traveling @ 95 km/hr (26.4 m/s), will a friction force be required? If so how much and in what direction? 2. Relevant equations Fn = mg cos 12° ƩFn sin 12° = m (v^2/r) Ffrmax = μFn 3. The attempt at a solution Seen many different versions of this question asked so here is what I have attempted... Vertical Force on the car at that angle Fn = 1200 * 9.8 * cos 12° = 1.2 x10^4 N Horizontal force ƩFn sin 12° = m (v^2/r) ƩFn sin 12° = 1200 ( (26.4)^2/67) = 5.8 x 10^4 N max total static friction force of the Ffrmax = μFn = (.6) (1.2x10^4) = 7200 N Based on my answers I would say additional force would be needed (5.8 x 10^4 N-7200 N=5.1x10^4) perpendicular to the curve. Would you guys agree or where have I gone wrong?