Angular Momentum Demo: Spinning Bottle

In this demonstration, water that is originally at the bottom of a bottle splits when the bottle is rotated, with some of the water going to the top of the bottle and some remaining at the bottom. This split increases the moment of inertia of the system and decreases the angular velocity to conserve angular momentum.

[TGX]

Man I love physics professors. It might not be the case everywhere but it seems university physics professors are just cool flipping dudes. Like damn.

[paulm]

Honestly just saying "kids play this game called flip the bottle" was the best move to stop this trend

[PersonManManManMan]

These little demonstrations are easy way to understand how angular momentum and inertia works, great explaining!

[aikiemarais]

I learned of this effect from my Gramma in the 1960's, but did not know the scientific name until much later. She showed me how to detect whether an egg is boiled or not. A boiled egg will spin fast on a table top, while a raw egg will only spin sluggishly one or two revolutions.

[davecrupel]

1:08 "we're gonna water these plants with.."

The blood of your enemies, Professor? c:

"This water with red food coloring"

Oh, ok. That works too.

[TriptoPal]

This the way to get connected with Physics!
With simple and everyday things!

[rockerzzz]

he really is catching it well while looking at the camera.

[nas]

*His grandson playing “flip the bottle” with his friends*
Him: Hmmm, Interesting 🤨🧐

[champadevi]

4 years later and I think this video is gonna hit the YouTube algorithm

[BoomShard]

This video got all this attention within the last week. Great video.

[yannispetros]

It's very clear! The water remains in the bottle...Amazing!

[Crlarl]

Scientists, like artists, see beauty in the world everywhere. Unlike artists, instead of grabbing a paintbrush, they go get a calculator.

[DANGJOS]

I've noticed this same phenomenon, but never really gave the reason much thought. Makes a lot of sense, thanks!

[jagula]

I was waiting for him to do bottle flip at the end xD

[DrLumpyDMus]

"Dylan, what's that glass tube thing with the picture of Tommy Chong on the side, that you kids are passing around?"

""Oh. Uh, hi Grandpa. We're playing 'Flip-the-Bottle' "

"Hey, great! Let me show you a little about angular momentum"

[BuriedFlame]

Best supporting actor to the plane apparently flying donuts around the area.

[JH-KU]

A nice demo for conservation of angular momentum. Thank you.

[moviepatel]

Had he landed the bottle perfectly, would have been even better ending

[abzein]

Science students are also good at sports. I mean just look at him how professionally he is catching the bottle 👍👍

[fsj]

Cool, now that you explain it I can see what's happening. Neat, thank you!