Hey I am doing a assignment on Roller coaster physics and i am to design a Roller coaster taking all the aspects of physics. I am stuck at my banked curve i dont know what formula to use to find the angle of the curve. I have seen this formula in the forums Tan theta=v^2/rg but the thing is i dont know how that formula was derived so i cant useit in my assigment unless i know how it was made. So if someone know how to make that formula or another forumula i can use please could you post it. Thanks ahh ya and i for got to say that you can ignore friction.