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Comment on The Physics of Colliding Ballsparent

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Since it also doesn't mention friction I'm a bit confused what effect, if any, you were expecting to see.

Dealing with friction complicates matters significantly. At the very least you can't expect the collision to be elastic.

Actually, I believe that it can be elastic, if the friction is so great that the surfaces do not slip the entire time they are in contact.

til how rubber bouncy balls work

Yes. They can bounce back and forth due to the spin reversing. I believe each time they make contact with the floor, high friction causes of spent to stop, while they undergo a rotational deformation, which then reverses direction.

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