I am confused on what the correct way to do this is. In my old physics textbooks, they say that the x component of gravity is responsible for the centripetal force. However, on the internet and for more advanced topics they say it is the x component of normal force that is responsible for the centripetal force. Analyzing this myself, it seems like it does not matter which method is used, as long as you pick a specific viewpoint and stick to it. Does this hold true? Or is one of them more correct than the other? Thanks.