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TheCupboard
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According to the New York Times Science section, "a key to understanding the phenomenon, [said Dr. John Biggins, a Cambridge physicist] is that mathematically, a chain can be thought of as a series of connected rods. When you pick up one end of a rod, two things happen. One end goes up and the other goes down, or tries to. But if the downward force is stopped by the pile of chain beneath there is a kind of kickback, and the rod, or link, is pushed upward. That is what makes the chain rise..."

He continues, "'Finding a new physics problem in an Internet video was,' Dr. Biggins said, 'something of a treat. For a scientist it's "really reassuring" that new problems like this can pop up,' he said."

In other news, physics, (along with Newton's 3rd Law) how do they work?

Old Post 03-11-14 13:03 #
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MajorRawne
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It's funny how this can be answered with a quote from the Doom film:

"I gotta take a dump."

Old Post 03-11-14 20:21 #
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Creaphis
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I saw this a while ago. I've heard half-a-dozen different casual explanations. This seems to be one of those things like powered flight where nobody can come up with a satisfying force diagram. My dad actually thinks this is video trickery.

Old Post 03-11-14 20:36 #
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Kirby
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Creaphis said:
I saw this a while ago. I've heard half-a-dozen different casual explanations. This seems to be one of those things like powered flight where nobody can come up with a satisfying force diagram. My dad actually thinks this is video trickery.
That's all I keep thinking after seeing it. I feel like he stuck the jar onto a surface upside down and then manipulated the chain from there. That's just me being quizzical, though what would anyone actually need to do to replicate this anyways?

Old Post 03-11-14 21:43 #
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tourniquet
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Believe it or not but it's no fake. I watched a documentation on TV a few weeks ago where this phenomena was explained.
It's basicly refering on Isaac Newtons law of inertia.

Old Post 03-11-14 22:32 #
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Technician
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tourniquet said:
Isaac Newtons law of inertia.
I wanted to post that. I wanted to look smart for once.

Old Post 03-11-14 22:50 #
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Maes
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It's a variant of fluid siphoning, but with a solid, segmented body instead of a liquid.


Creaphis said:
This seems to be one of those things like powered flight where nobody can come up with a satisfying force diagram. My dad actually thinks this is video trickery.


Seriously? When was that, in the early 19th century?

https://www.grc.nasa.gov/www/k-12/airplane/Images/climb.gif

http://www.copters.com/aero/pictures/Fig_2-87.gif

Old Post 03-12-14 13:10 #
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Creaphis
I will deliberately take a contrary position just for the sake of writing incredibly long arguments


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Maes said:
Seriously? When was that, in the early 19th century?


Alright, well, I was thinking more along the lines of how theories of aerodynamic lift like "the Bernoulli effect" tend to have their limitations, but I didn't want to spend much time making my half-assed point. Forgive me for not delving deep into theoretical physics to make a better analogy.

Old Post 03-12-14 16:27 #
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gggmork
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I always thought there has to be some great siphoning troll opportunity somewhere, like move an entire lake from one place to another with a big camouflaged tube or something. Though there's enough ecosystem destruction, so I guess no.

Old Post 03-12-14 16:35 #
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flubbernugget
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Maes said:

Seriously? When was that, in the early 19th century?



If my understanding is correct, those diagrams show how the forces exist, but don't show why they exist.

Old Post 03-12-14 22:09 #
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Maes
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flubbernugget said:
If my understanding is correct, those diagrams show how the forces exist, but don't show why they exist.


It's easy to forget that air is still a fluid and not vacuum...

http://assets.openstudy.com/updates/attachments/4e1c50990b8bc227574857a3-jonnymca-1310498820194-airplanewing.jpg

Old Post 03-13-14 16:51 #
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Waffenak
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Fascinating phenomenon and for aerodynamic lift force: are there people who live in barrels and dont believe in laws of physics? people sure can be stupid and ignorant

Old Post 03-13-14 17:39 #
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Gez
Why don't I have a custom title by now?!


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Waffenak said:
are there people who live in barrels and dont believe in laws of physics?

They call themselves Creationists.

Old Post 03-13-14 18:06 #
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TheCupboard
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Is it just me or did Maes assume control of this thread with his usefully labelled diagrams?

Old Post 03-14-14 09:31 #
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