Undergrad Marble spiralling inside a cylinder- New video

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A new video related to an old discussion on marble spiraling inside a cylinder has sparked interest, particularly regarding basketball shots that bounce off the rim. Observers noted that a basketball can appear to rotate around the rim before either falling through or bouncing out, with some suggesting that the center of gravity may dip below the rim during this process. Steve Mould's follow-up video explores this phenomenon using a bouncing ball as a model for rolling in a cylinder. Participants in the original thread are encouraged to revisit the discussion for further insights. The connection between the new video and the previous physics concepts enhances understanding of these dynamics.
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Huh, very interesting!

Sometimes when I'm shooting basketball hoops, my shot will be off-center but inside the hoop. If it catches the rim just right (just wrong?), I can see several rotations around the inside of the rim before the ball finally falls through or gets spit back out. Several times I could have sworn that the center of gravity of the basketball was below the plane of the rim before it got shot back out, and maybe this video shows an explanation of why that can happen. It will still be frustrating to miss like that, but at least now I'll know why...
 
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A.T. said:
Steve Mould made a follow up video
With a contributing video from you, which inspired this one, if I may add ;).
 

Thread 'Reference frames, center of rotation, etc'

Topic about reference frames, center of rotation, postion of origin etc Comoving ref. frame is frame that is attached to moving object, does that mean, in that frame translation and rotation of object is zero, because origin and axes(x,y,z) are fixed to object? Is it same if you place origin of frame at object center of mass or at object tail? What type of comoving frame exist? What is lab frame? If we talk about center of rotation do we always need to specified from what frame we observe?
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