Strange Rotational Behavior

I've seen a lot of things, but this one took my by surprise when I came across it on Youtube.

A rotating object flipping direction, appearing to violate conservation of momentum. Never saw this in school.

https://www.youtube.com/watch?v=1VPfZ_XzisU

Irving posted this up a while back. I think it might be in the cool video thread.

ETA: It was brutal that posted this up in the video thread: https://www.ar-15.co/threads/146129-...=1#post2244529

Irving also posted it in the Post Whore Thread.

Veritasium has a bunch of cool videos. As well as Smarter Everyday, Steven Mould, Vsauce, Practical Engineering, etc.

My apologies, I didn't realize it was posted previously.

Didnt watch entire video, it is 3d, and it has X-axis Y-axis and Z-axis at Cartesian coordinates.
If ZERO force applied to 1 axis, it will just spin 1 way.

Credit :Thanks my High school Physics teacher from 90s.



Now, if you want to talk detail mechanical/classical movement in Jupiter with much higher atmospheric pressure + You drop it from 1000 ft from top, and you try to hit a spinning racquet with tennis ball in the middle of spin, it requires 20%er. :D

Quote:

---

Originally Posted by Duman

My apologies, I didn't realize it was posted previously.

---

No need to apologize for spreading cool stuff bub.

Quote:

---

Originally Posted by Irving

No need to apologize for spreading cool stuff bub.

---

Repetitio est mater studiorum

Quote:

---

Originally Posted by MrPrena

Didnt watch entire video, it is 3d, and it has X-axis Y-axis and Z-axis at Cartesian coordinates.
If ZERO force applied to 1 axis, it will just spin 1 way.

Credit :Thanks my High school Physics teacher from 90s.

Now, if you want to talk detail mechanical/classical movement in Jupiter with much higher atmospheric pressure + You drop it from 1000 ft from top, and you try to hit a spinning racquet with tennis ball in the middle of spin, it requires 20%er. :D

---

That's ok if the moment of inertia is identical in all 3-axes. The asymmetry of MOIs gives rise to the flipping of the spin vector.

Quote:

---

Originally Posted by Irving

No need to apologize for spreading cool stuff bub.

---

Yep. Just providing some context.

Quote:

---

Originally Posted by Gman

Irving posted this up a while back. I think it might be in the cool video thread.

ETA: It was brutal that posted this up in the video thread: https://www.ar-15.co/threads/146129-...=1#post2244529

Irving also posted it in the Post Whore Thread.

---

My posts usually follow Irvings posts after I've gone down a rabbit hole watching his.

Last few days it's been Project Farm. Check him out. I'm making a dang list from his tests.

Project Farm is a regular stop for me on YouTube. Same goes for SmarterEveryDay and a number of others.

I'll look into Project Farm, it sounds interesting.

The last week or so I've watched Youtube videos on the derivation of euler's number, klystrons, magnetrons, and radar.
Having a general idea of how something works is good but a detailed description (sans mathematics) is better.

I like the mathematical history explanations. I was trying to understand the Gamma function for my work and have googled many documents.
But a clear, verbal, and dynamic explanation always works better for me.

The strange tennis racket rotation is a looong video but worthwhile, towards the end explains why the earth's spin vector won't flip.

I'm also watching videos on induction heating for melting metal. Some people doing interesting things out there.

You should post them up in one of the video threads. I never quite know where to stick videos often times.