Find a the maximum value at which the cup does not move.
Our task is very simple and it's the following: What's the maximum speed of the whole robot for which the cup will not fall? Try to find it. Experiment. Change the speed. It's not 100 because you can see that if the power is 10, the cup does not fall and if it is 100, the cup moves.
This is a companion discussion topic for the original entry at http://www.fllcasts.com/episodes/408-ev3-phi-task-find-the-maximum-speed-without-the-cup-falling-from-the-robot