1. The problem statement, all variables and given/known data I feel like I am being told that there two different kinds of normal force. 1st. In grade 11 we were always told that normal force on an angle equals m*g*cosθ, where Fn equals the y-component, and θ is the angle between Fn and mg. 2nd. Now in university we are told that the normal force can also equal (m*g)/cosθ, where θ is still the angle between Fn and mg, but mg is the y-component and Fn is the hypontuse. What is going on? The only difference that I see is changes to what the x and y axises are. Why does changing the x and y axises change the ratio of Fn and mg?