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Science off the Sphere: Knitting Needle Experiment
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- Опубликовано: 5 фев 2012
- International Space Station Expedition 30 astronaut Don Pettit uses knitting needles and water droplets to demonstrate physics in space for 'Science off the Sphere.' Through a partnership between NASA and the American Physical Society you can participate in Pettit's physics challenge and view future experiments here: www.physicscentral.com/sots
I like the way the astronaut tries to make the case for the electric potential being SIMILAR to the way gravity works with planets. When in reality the two are the same thing, The same rules apply on all scales. Every single body in the universe is charged whether it is a planet orbiting a star or a water droplet orbiting a knitting needle. Even our own bodies carry a charge.
The electrostatic field has a magnetic component.
Water is attracted regardless of field polarity.
It turns out the "gravity effect" where on one side there is attraction, and on the other hand, inertia forces - which forms stable "orbits" like the orbits of the planets.
Thank you you saved my life
Thank you, you helped me get my work done 🙏
We have so much to learn. 1000's of years from now, this will be seen as a space parlor trick.
Wow, great idea to try this experiment/demonstration.
I'd like to see what happens to the orbits when you bring a magnet near it!
in a vaccum box
you vaccum tn space. take it back to earth . or take the emply to a vaccum to earth
I don't know why, but I love the narration, makes the video so enjoyable
Fascinating!
i knew don pettit would come up with more fun stuff to try out up there!
always fun to watch.. thanks and keep em coming =)
good narration.
To have an attraction like this, there needs to be a difference in charge between the two objects. If you applied a charge to the floor of a spaceship, it would attract all the neutral objects inside the ship, but as soon as an object touched the floor, the charges would equalize, and the attraction force would disappear. For this to work, you would need to create an electrical isolation barrier between the floor and all the objects. Also, the amount of charge necessary would be HUGE.
Q: Can the rotation of the droplets be influenced by rotation of the needle?
And: If the Sun would stop rotating, then why don’t the planets fall into the Sun?
More videos like this!
We have peaked as a species. I love everything about this video.
If any of you twits criticizing this had paid attention, you'd have heard he said this was in his "crew preference" kit. These are items they take that are not related to funded experiments. This was done on his free time and with his own belongings and out of his own curiosity.
Ah man that just totally blew my mind.
As he said, that is why a differing needle is set near the water jet exit to charge the water drops.
It takes a science geek to new heights.
Amazing and beautiful at the same time.
The technology that we are going to be able to design specifically for space are all going to be sooooo amazing.
@DAN3EL The public communication of science and getting the public interested in science is a far more important goal.
anyone who thinks this is useless, listen to what this dude is saying or just read the description. it can reveal even more stuff about our universe
Love the way he says knitten needle hehe instead of knitting needle
Love this
It's rather... beautiful.
And this, my friends, is the best 360p quality you'll ever find on RUclips !
What if you put the needle on a drill an spin it? Would the water droplet spin also and be in a locked orbit?
I counted 19 times. Plus 1 occurrence of "knittin'" and 2 where he just says "knitting needle" (just killing time)
Proof that you can't judge someone by where they grew up.
Thank you NASA for being awesome.
Awesome !!
Interesting to think I'm watching this while on the toilet streaming this through 3g on my phone.. The times are changing with space and phone technology.. But so far the toilet hasn't changed in fifty years
awesome!
@dfhohi The water isn't absorbing the charge, no. It is statically charged in a similar way to how the knitting needle is charged, by friction with the Teflon syringe. The syringe is to the drop as the paper is to that first needle...
@Autonova, Good question. The water droplet is attracted to the charge because of the polar nature and (relatively) free rotative ability of water molecules. Imagine it like water molecules are a bunch of tiny magnets that can all change orientation relatively easily. What happens is all the molecules line up with the charge, which induces a net attractive force. Thus we see the behavior in the video. That's my understanding anyway, someone correct me/clarify if I'm wrong/misinformed. :D
How cool! If anyone up there knits something with your needles, please do share that too! You could knit a moebius loop!
@GPow69 yeah, because water is so magnetic.
Nieźle się tam bawicie, w tym kosmosie.
His accent and pronunciation of some words is a stark juxtaposition to his knowledge of what's happening.
Damn that's very cool. I love it!
@getplaning There is not much resistance to slow the moon down. It is actually getting farther away as it takes energy out of the Earth's rotation.
Now that's cool
Awesome!
I wonder what effect spinning either the droplets or the needle would have on the motion of the droplet?
As always.. very nice video. :-)
@ringlerum Weren't you listening? He explained perfectly why they orbit.
@thethreesuns Not the high/low tides, i meant everyone is blaming "global warming" on car pollution and apparently that alone is causing the ice caps to melt. Im asking if the suns gravitational pull is like the static charge on the needle and we're being pulled closer which would cause the earth to heat up and melt the caps, rather than pollution.
Interesting!
Where do we sign up for more of these?
Truly one of the most amazing videos I've ever seen.
The song 50 50 by the storkes goes perfectly with this video
@Jinmane I would expect that the needle would become slowly de-electrified, eventually causing the droplet to either collide or separate away from the needle.
I mean, he is a wonderful physics professor...
@DFredleinPortfolio teflon is hydrophobic, the needle is charged.
@arjunkc He quite obviously says the needle is 8mm in diameter and that isn't even the contributing factor. Like, right at the start of the video. It has to do with the static charge held by the needle. Which is also clearly stated several times throughout the video.
I would really like to see how water, or other objects behaved around a spherical, round object. My guess is it would continue to orbit around much longer
It is wonderful.
I am very interested.
Gravity and kinetic energy
Coolest video on youtube.
@jfreeman81 I guess he found it interesting to bring some with him to do this kind of experiment.
Pretty cool! Thanks for sharing :)
Great experiment! Have you tried another materials, like sugar?
Great demonstration. Is that some kind of sowing needle?
@Mofoe2001 That depends on the initial velocity of the load.
@BLOWtom Madness?
THIS! IS! SCIENCE!
@metalassaultlogin arbitrarily, the needle is in this video
That is SEW cool!
just woww!
Don Pettit, you are awesome! And sound cuter than a bug's ear! Thanks for making my day. =)
The cloth knocks electrons off of the needle leaving it posotively charged. Meaning that the two pairs of lone electrons on the oxygen atom in the water are attracted to the posotively charged needle. As for the spinning I havent got any ideas.
@planetrob555 Electrons don't really "orbit". Orbitals was a word arbitrarily chosen to represent the different energy levels.
lovely, thank you for sharing :)
He's all like "it's useful to have these when you want water to orbit a knitting needle" LIKE THAT JUST HAPPENS EVERY DAY. lol
@FisherVictoria It's a reusable space vehicle made with base tech from the 1970s. How could you NOT expect it to be bloated and complicated? It did provide a more convenient means for frequent flights than rockets--so much so, that we've actually forgotten a nice chunk of one-time use rocket tech.
You can expect shuttle successor and space plane tech being developed now to be a lot more compact and sophisticated.
I figured it'd be good to have a teflon knitting needle on a Space Shuttle. Instinct win.
Direct vector to the needle before the drop of water hits the charge will cause it to deflect and orbit?
ohmygoshhhh i love knitting
@pythor2 Oh yeah, good point. Thanks
make them do double or triple orbits or arrange them in different shapes so they orbit around the "knitting needles"
Would have liked to see two knitting needles parallel to each other.
좋은 원리 감사함니다
Interesting.
Cool - and I don't CARE how often he said knittin' needle - this was fun! ;-)
what if u can manufacturing out of the same niting needle material a sphere and try the experiment again with the sphere suspended with string
how neat is that?
Cool! a macro-scale demonstration of how a mass-spectrometer works!
unfortunately needs zero-gee (aka microgravity) to operate properly
@thethreesuns @WhoooLovesOrangeSoda An interesting fact (that you may already know) is that us people that live in the northern hemisphere, are actually backwards in the seasons. i.e. When we are closer to the sun, we are in winter and viceversa, so being closer to the sun is not what is melting the polar caps
@asdf8926 it could be a sphere as a core? or what would happen if you release one of those magic cubes made of magnetic spheres? or charged teflon spheres
@pharaohoftheincubi without a doubt!
space and science is sooo cool! But how did they get knitting needles into space? I can't even get onto a regular flight with nail clippers!
@dmenis5354 instead they decided to play with needles and bubbles...Good job NASA!
I'm a bit skeptical that the third knitting needle is required. Water is polar, so experiences electrostatic attraction to charged objects even if it's electrically neutral overall, though the force is not inverse square. If you could charge the droplets (say by connecting a metal plate in the syringe to a battery) then you could use the same pole to accelerate them away from the tip.
A charged sphere with spherical symmetry of the potential would be awesome!
why do they change direction when going back up?
haha, I love how he says "knittin' needle".
@ANMLgaming Nope, he's on a commercial airline. You can do this your self actually, just be sure to pack a syringe of water and multiple knitting needles or other sharp rods work as well. Also be sure to tell the TSA exactly what you have just in case they don't search you. They need to document each science experiment that happens on airlines.
I know this is a static charge, but is a similar principle the reason for rising ocean levels? The sun being the needle and the earth being the drops of water.
how do they take baths in space? sponge baths?
Knitting the needle was said so many times!
Do the same principals apply when it is not liquid water, or if it is other frozen gases? If so could this idea have a potential of gathering burnable gases such as methane gas when probes as well as other types of long distance space craft are traveling from earth to distant neighboring systems,in order to provide a quick return to earth for the collection of the probe's data?Last question if it is easy to answer, how long will the specific types of cone ended cylinders maintain there charge?
how about around object was knitted?
What's that cylinder rod that the water is orbiting?
how long will the charge disappear in the knitting needle?
Fantástic 👏👏👏👏👏