Unfortunately, this writeup doesn't mention any words like "spin" or "rotation" ...

_Microft · 2024-09-30T15:12:28 1727709148

The intended audience is the author himself.

Edit: You’re reading his notes/summary of the topic. Basically what he’s understood so far. “Expository webpages - For my own future reference. Intended audience is myself.”, see https://vanhunteradams.com/#Expository-webpages

playingalong · 2024-09-30T17:20:03 1727716803

Chances are the author is in 11th or 12th grade. And you two might be on the same page.

(Just joking).

contravariant · 2024-09-30T17:20:12 1727716812

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.

kazinator · 2024-09-30T23:15:30 1727738130

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.

Jerrrrrrry · 2024-10-01T05:20:13 1727760013

til how rubber bouncy balls work

kazinator · 2024-10-02T20:17:03 1727900223

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.