11–20 of 22 posts
Unfortunately, this writeup doesn't mention any words like "spin" or "rotation" or "angular", not even to disclaim that those aspects are not presently being addressed. It looks like a great resource for kids in grade 11 or 12 physics.
Dealing with friction complicates matters significantly. At the very least you can't expect the collision to be elastic.
https://mathoverflow.net/a/156407
(updated link to original, not the repost)
For an interesting exploration of how even the simple physics of two blocks hitting one another can lead to surprising conclusions, I'd highly recommend this 3Blue1Brown video called "Why do colliding blocks compute pi?": https://www.youtube.com/watch?v=jsYwFizhncE
A lot of times with math I don't think the word "why" should be used. Those blocks computing pi was a good example where they "proved that they compute pi", but not really why. What is the real distinction I'm trying to make here and how to explain it?
https://easylang.online/show/#cod=jVPbbptAEH3frzhSpMqJFYppI0...
Unfortunately, this writeup doesn't mention any words like "spin" or "rotation" or "angular", not even to disclaim that those aspects are not presently being addressed. It looks like a great resource for kids in grade 11 or 12 physics.
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.
If you hold 2 balls up, and let them fall, 2 balls swing up on the other side. How does it know how many you swung??? It boggled my mind for the longest time. Then I got to playing with one, and found something interesting. It doesn't always seem to work!
If the balls are perfectly aligned, and touching each other, the effect is dampened by the multi-body collision. It's strongest when the balls are just barely not touching.
What we see as multiple balls swinging and hitting is really a whole bunch of individual 2 body collisions that are close enough in time to seem like they are a single event.
I could be wrong about the reason, but this was my observation.
Earlier quoted context omitted.
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.