i'm stuck on this one. some bootleggers race from the police down a road that has a sharp, level curve with a radius of 30 m. As they go around the curve, the bootleggers squirt oil on the road behind them, reducing the coefficient of static friction from 0.66 to 0.18. When taking this curve what is the maximum speed of: a) the bootlegger's car? b) the police car? My free body diagram has w=mg in the negative y, and Fnormal in the positive y...cancelling out but because the problem doesn't involve any masses i assume that you don't need to find the force normal or weight. I dont know what else to draw on the free body diagram other than the force of static friction pointing to the center of the curve? I dont know where to start with this.