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[Youtube Review][Veritasium] The Bizarre Behavior of Rotating Bodies, Explained
twoyou 2021. 2. 6. 14:36
Playtime Comments : [Veritasium] The Bizarre Behavior of Rotating Bodies, Explained
Th**************:
3:44 "It's not just tennis rackets, I've [failed to do] this before with cell phones"
Me: I'm going to end this man's whole career
tries to properly flip phone end-for-end 12 times
:'(
ma*************:
13:10 Wow! Nice animation
(As the earth moves into night the lights turn on)
Em*******:
The spinning thing at 5:15 reminds me of the way earth's magnetic field reverses.
TH**************:
14:37 You know my MySpace password?
Mi********:
2:00 ive experienced this pain for 5 years now, and still dont know why my tv remote doesnt flip on a singular axis, guess im about to find out
Ka***********:
3:45 who else flipped their phones while watching this
Du******:
0:48 Name of the movie?
Top Comments : [Veritasium] The Bizarre Behavior of Rotating Bodies, Explained
Ma*********:
This is literally the back bone of skateboarding flip tricks
"No"
"We're going to prove you wrong"
> Concludes the intro after 6 minutes of talking.
Ga*******:
The goal of this video is to prove Feynman wrong.
8 minutes left.
Da**************:
"Normally I don't like to talk about centrifugal forces" lol
Al***********:
Mum: “so what did you learn today?”
Me: “it’s spinning about its maximum moment of inertia”
-Terry Tao
Su***************:
I would have appreciated it if you covered the other axes of rotation in the same way, showing why the same centrifugal forces wouldn't have been present in the other scenarios.
11**************:
Imagine being on a rescue mission observing something effect which can flip the earth.
Mi******:
I’m just happy there is a scientific explanation for that
Al********:
Believe my classmech professor spent a whole week on this, smh
Et*********:
So if we dug up a bunch of mass around the equator and put it on the poles, we could get the earth to flip sideways?
Al***************:
There is also a skateboard trick called the impossible flip because of this. They counter it by leading the front foot trough the flip to keep it from flipping on the other axis.
jo*********:
Great video. You describe the spinning object as being “bumped,” and that triggers the cascade of axis flipping. I assume that bump comes from the air resistance, or maybe from an imperfect spin. What if you eliminate Those? A vacuum has no air; will the wingnut still flip? Do imperfections in the initial spin affect this phenomenon at all?
Da******:
The key to get an intuitive understanding is to jump into a non-inertial reference frame!
jp******:
"The goal of this videdo is to prove Feynman wrong."
*gets popcorn*
Da*********:
"The goal of this video is to prove Feynman wrong."
You have high ambitions, young man!
Is**********:
Spent all my teenage years playing with the tv remote, flipping it on the air and noticing the flip. I never asked why I couldn't flip it vertically without it turning. The trick for me was to throw it higher, so it would turn 2 times, so I would catch it how I threw it.
Similar with phones when they came around.
Then, older I became a bartender for a while and while flipping bottles and stuff (flair bartending) I sometimes noticed the same thing as I would try to get the label to face "forward" when the bottle landed on my hand.
You just solved a mini life-long question that I had hahahaha.... kudos!
(I was getting a bit judgemental when you mentioned proving Feynman wrong -- "this guy is cocky" hahaha... but then you brought Tao into play and it was all good -- and anyways, is still a bit cheating as Feynman didn't have all the 3D bells and whistles we have today)
in***********:
I'm still having a difficult time understanding. The video talks about the y axis getting a small bump, which puts them off the axis. Is the argument here that it would be possible to flip along an intermediate axis without the weak masses flipping if all the forces were perfectly balanced? This does match up with my intuition as I always thought that this had something to do with balancing a pencil on its sharp end, but I also find it a little bit confusing, because if this were the case, then I'd also expect the flip to not be perfectly periodic, because any small change (such as the air blowing or something) could easily upset this delicate periodic "balance."
Jo*****:
As a carpenter for over fifty years I've recognized this behavior with flipping of a hammer because I early on decided to teach myself to juggle hammers. I tried to prevent the twist-flip with absolutely no success. It became clear there was more stability in working with the flip instead of against it. This explanation is such a relief! I thought it was a personal curse. Now I realize hammers are the perfect object to demonstrate this motion because they, unlike tennis rackets, have no symmetry about any axis!
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