Circular Motion I think what I don't understand is how to find the normal force, especially with an object on a hill. My teacher didn't go over it very well so I have only a vague understanding of it. [b(] Here is a sample question that deals with it that I can not seem to figure out how to go about it. A 1000-kg sports car moving at 20 m/s crosses the rounded top of a hill (radius=100m). Determine the normal force on the car. I think if I understand how to do this problem, I'll be fine with the others. Thanks for any input! *edited. Sorry! I posted the wrong problem. haha. This should be the one. Yup, normal force.