Lagrangian Forces of Constraint. Will a block sliding down a parabola ever fall off?

Here is a problem. A starts from rest NEAR the top of an inverted parabola. If there is no friction, where (if ever) does the block lose contact with the surface? Here is the code I used in this video: https://trinket.io/glowscript/4699614b28 Here is my video for a block on an inverted sphere    • What angle does a block leave the surface ...   Second Semester Classical Mechanics Playlist    • Classical Mechanics 2 Spring 2023