1. The problem statement, all variables and given/known data http://imgur.com/ZGvC1 At what angle does the cart fly off of the track? No other information is provided 2. Relevant equations I know that energy is always conserved (total energy before = total energy afterwards). 3. The attempt at a solution Equation for energy before = energy after: mgR + Ek = mgh + 1/2mv^2 mgR = mgh + 1/2mv^2 (h is the height above the ground just before the cart leaves the track) gR = gh + 1/2v^2 v^2 = 2g(R-h) --> This is the velocity just before the cart leaves the track The dotted line that we see is equal to R. Thus, Fc (centripetal force) = mv^2/R If the cart were to leave the track, Fn (normal force) would equal 0 Where do I go from here? Am i on the right track?