Car on banked curve, find friction coefficient, normal force, frictional force, physics problem.?

First of all, don't forget to convert m to force for the weight Draw your force diagram with the X axis parallel to the curve. You have Normal force entirely up, weight at a 9 degree angle with the -Y axis, friction force perpendicular to the weight, and the resultant is centripetal force Perpendicular to the normal force. Don't include a Z axis, since that would just be the forward motion of the car. Since the car isn't leaving the road, the Normal force equals the weight times sine of the angle. Also, centripetal accl. Equals velocity squared divided by the radius. Multiply that by the m to get the resultant force, which multiplied by sine of the angle equals the frictional force. Of course, normal force times the coefficient equals frictional force, so you now have everything you need.