1. The problem statement, all variables and given/known data 2. Relevant equations 1/2 mv^2 = mgh 3. The attempt at a solution first, a side question, if p = mv, can't we just place p into 1/2 mv^2 so it becomes 1/2 p^2? anyway, on to the question, at the point where the cube falls off, the Fnormal should just about equal 0, correct? is this the way to approach the problem? Or we can find the velocity where the cube loses contact with the sphere and plug that v into 1/2 mv^2 = mgh, solving for h.