1. The problem statement, all variables and given/known data A solid sphere of mass m and radius r rolls without slipping along the track shown below. It starts from rest with the lowest point of the sphere at height h above the bottom of the loop of radius R, much larger than r. (Consider up and to the right to be the positive directions for y and x respectively) What are the force components on the sphere at the point P if h = 3R? (Use any variable or symbol stated above along with the following as necessary: g for the acceleration of gravity.) 2. Relevant equations Isphere=(2/5)mr2 K=.5mv2 K=.5Iω2 PE=mgh ac=v2/R 3. The attempt at a solution Fx First, solving for v2 mg(3R)=.5mv2+(.5)(2/5)(mr2)(v2/r2) mg2R=.7mv2+mgR v2=20gR/7 Centripetal acceleration is the acceleration in the x direction a=v2/R=20gR/7R Fx=ma=-20mg/7 <=== Correct! Fy Force in y direction is only the force from gravity F=ma Fy=-mg <=== Wrong! please help! What am I missing?