1. The problem statement, all variables and given/known data If a curve with a radius of 88m is perfectly banked for a car travelling 75kn/h, what must be the coefficient of static friction for a car not to skid when traveling at 95 km/h 2. Relevant equations F=m(aR) F(Normal) x sin0 = m(v^2/r) 3. The attempt at a solution I've asked my teacher this problem from the book twice and he skimmed through it both times really quickly and I didn't really understand him (hes a busy guy and has a lot of classes right after mine). What i did so far was convert the km/h to m/s and draw a free body diagram showing the forces that are acting upon the banked car. Assuming friction was 0 in the first case I tried getting the banked angle but not sure if was correct then in the later part (95km/h) I attempted to find Fr. I know that the forces acting upon pulling the car towards the center and pushing away from the center must be equal or else the car wouldn't stay on the road.