direction of normal acceleration problems

1. The problem statement, all variables and given/known data







2. Relevant equations



An = mv^2 / r



3. The attempt at a solution



I get the 2D free body diagram, and how the vertical components are resolved, but how is Nc sin θ = mv^2 / r when they both are in the same direction?



Also another related problem is this diagram here:







The equation for the mass at B is,



mg = Fc + N



How is this so when both Mg and Fc are directed downwards (Fc being the centripetal force mv^2 / ρ). Shouldn't it be mg + Fc = N?



I guess I don't understand the direction of Fc due to the normal acceleration. in either of these problems.