Hi, I have another query related to rolling motion. Lets say a disc is rolling purely with a velocity vo (this being the vcom). It encounters a step.lets say that the step has a height h, where h < r, i.e., the step has a height less than that of the height of the center of the disc. SO, only a corner of that step will touch that disc. Let the friction of the wall also be high enough that it resists slipping of the sphere upon contact. Then what happens to the velocity of the disc afterwards?