Brian Cox visits the world's biggest vacuum | Human Universe - BBC

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Watch the BBC first on iPlayer 👉 bbc.in/iPlayer-Home Brian Cox visits NASA’s Space Power Facility in Ohio to see what happens when a bowling ball and a feather are dropped together under the conditions of outer space.
In this episode, Professor Brian Cox explores our origins, place and destiny in the universe. We all start our lives thinking that we are at the centre of the universe, surrounded by our family and the world as it spins around us. But the urge to explore is strong. Brian tells the story of how our innate human curiosity has led us from feeling that we are at the centre of everything, to our modern understanding of our true place in space and time - that we are living 13.8 billion years from the beginning of the universe, on a mere speck of rock in a possibly infinite expanse of space.
Human Universe | Series 1 Episode 4 | BBC Four
#bbc #HumanUniverse
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[@DexM47]

I love the fact that they know exactly what's gonna happen but still find it marvelous when it happens.

[@g4macdad]

Shows that atheists are not nearly as sure as they pretend to be. In fact, sure of nothing.

[@aleksandaraleksic4067]

They spend money and 3h of their time just to film this. Idiots, they don't need chamber this big, and best of all it is a cornerstone law of physics, so better believe it and go to the pub.

[@ReasonMakes]

It is the most satisfying thing in science to predict something and then see it follow your prediction

[@aleksandaraleksic4067]

@@metroid1 Of course.

[@ysteinlndalnilsen9924]

@@g4macdad Wait so only atheists believe in gravity?? I really don't understand what atheism has to do with this video. But if ur wondering why scientist make a smile when theories gets proven correct, its simply the fact that in science u have to prove to be right. Even tho we know pretty much 99% that a theory is correct we still have to test and prove till we truly know the facts. On the other side we have people like u, who i assume is religious. Would u say believing a book written by who ever 1000+ years ago is being critical? Sure u can believe it, that's up to u and i have no problem with that. But in science we actually try our best to look for the facts and explore this wonderful world and universe. If everyone was just gonna read one book and not keep looking for new answers we would not be here on a computer watching this video right now. U should never underestimate the importance of science. And also, there are multiple scientists with religious beliefs.

[@jurassicparkmark4188]

Who else is watching this in 2020 because your teacher made you

[@AndreaVegaa]

okay but what conclusions did u get, cause they asked me that and I have no idea m8

[@keenynman34]

@@AndreaVegaa Theres gotta be a reason that the apple falls "Down" to the earth instead of going sideways or continuing up. He then developed a theory that there was a strange invisible force pulling things to the centre of the earth called "Gravity" And then he did a bunch of math and found out he was right.

[@user-ys3ml9jn5m]

me from Japan

[@kamyip4226]

Y e s- H e l p-

[@Saami674]

yes from French

[@pandorahecate1584]

Absolutely fascinating. Makes me wanna become a scientist. You can see how enthusiastic they are about it all makes me smile and its one of the most beautiful videos I have ever seen

[@SuzukiKid400]

Being a scientist or an engineer is a very rewarding career. A lot of frustration and issues to solve but when you get something to work as you intended, the joy is immeasurably satisfying!!!

[@amydxnne]

özcan aykın'dan geldik :))

[@marcelomarquez2089]

TCHUPVIEJEN

[@rick1646]

Imagine Galileo seeing it he would have cried watching this amount of beauty.

[@theseductivepotato7459]

Wasn't Newton the one who predicted that a feather and a brick would fall down at at the same speed if air resistance wasn't present?

[@theseductivepotato7459]

Oh my bad, just checked and turns out it was Galileo, thanks

[@emanuelxavier9923]

@@theseductivepotato7459 newton just prove mathematically the concept

[@unbeatableox3846]

@@emanuelxavier9923Physicists always prove things mathematically.

[@mbayoumi1]

@@theseductivepotato7459 500 years before Newton and Galileo, it was said in Arabic book written by Abu'l-Barakāt al-Baghdādī. , u can recheck

[@baekhyunee4u]

Everyone's saying their teacher forced them to watch this but I came here myself....

[@user-ug1cu6sw8g]

Same

[@hala4324]

LOL me too

[@parzival7309]

Same lol,there is no more beautifil thing than be passionated and curious about science,in every form it takes

[@LARRYSEIPRODUCTSLLC.]

Q: What if there was an exterior magnet that balanced the middle in-between magnets g-force rotation around center magnet? 😁 Also my opinion on gravity is that exterior of planet earth is the condensed pressure on to earth pushing objects down that are not closest to its properties (likes attract) oil and water separate and decide position from the greater amount of mass that surrounds the smaller volume of mass. Is this possible? Please explain. Thanks

[@Jay-lw8mi]

same

[@bengi-su]

Özcan Hocadan geldik iyi günler

[@JamalShengor]

özcan aykından gelenler burda mı

[@michaelmannucci]

I'm actually so frustrated that they didn't show this in normal speed. I want to see feathers fall at regular speed. Wtf is wrong with the producers?

[@TheSuperCommentGuy]

For once in our life we get to see feathers fall really fast. And then they slow it down!

[@evanwilliams8289]

didnt wait till the end of the video huh?

[@nitinbabu5100]

Michael Mannucci same!

[@alexleibovici4834]

+誰誰在 Yes, it realy sounds stupid. Why do you think it was faked? What results have you expected?

[@pinkfurryhat]

i did but it only showed one second of it

[@Desmodromic916]

In Nasa research center, they countdown from 10 before flushing the toilet

[@kougou48]

HAHAHAHAHAHA

[@Omi142]

Lol

[@willclark8970]

and call out "preparing for drop"

[@RV-fg3ml]

And gravity pulls the shit out of their ass

[@elijahcox6920]

Yes.

[@shubhanshsingh960]

Watching in 2022 because Rajwant sir said to.

[@sushantpal7283]

Watch in 2023❤

[@adam_fakes]

I love the look on the Engineer's faces, they know it, but to see it.

[@fromnorway643]

Yes, knowing something and seeing it with your own eyes are two different things. One of the Apollo 14 astronauts, Edgar Mitchell, once said in an interview that the lunar mission changed him from having an _intellectual_ understanding of the immensity of the universe and the Earth's tiny place in it to having a deep _gut_ understanding.

[@ianproudlove1540]

That was full speed u loony

[@eventcone]

@Bugs Bunny It was already "shattered".

[@shazanali692]

The engeneers probally never did this experiment until cox told them, so thats why they are amazed, or they had not done it in a couole of years

[@Amen-Magi]

If know somthing its not mean you be tierd too see it again .like seeing you family or eat your Favorite food.or listening you do it all your life you dont bored

[@TackerTacker]

Why did they show it in slowmo only? I'd have loved to also see it in real time :( Seeing a feather drop to the ground as fast as a bowling ball would've been the much more interesting shot IMO

[@dekab6133]

Yeah, it slightly piss me off the lack of real time shot.

[@MohammedAhmed-jg2rw]

I'm pretty sure that the bowling ball would fall at the same speed as the feather

[@-x-3694]

Watch in 2x speed 😎

[@dekab6133]

@@shamshiddy Nope, it's the feather that fall faster without attrition

[@DJFiBa]

It's NASA on BBC...

[@suyashnishad7131]

Rj sir ke recommendation ne to physics ka feel de diya

[@gamingturt]

In my opinion this is one of the most important videos of all time. We can actually the theory being proved in real time.

[@adamhowitt4033]

I’m sorry but what every person wants to see is a sheet of A4 paper go down perfectly straight and not do flips

[@Sithlug]

the feathers didn't move but hit the ground with so much more force and speed than with resistance, feather/paper very similar

[@druidofthefang]

and do not slow it down and show the same slowed down footage 17 times...

[@momo-zg3kn]

Nice pic

[@adamhowitt4033]

momo cheers, assuming you are talking to me

[@oldi184]

True, a sheet of paper would be more impressive.

[@TonyBullard]

I can't believe they never showed it fall at full speed! We've all seen bowling balls and other heavy object moves in slow motion...that's not unusual at all. But to see a feather fall quickly from that height without it being disturbed by air around it, that's novel! And yet the editors chose to leave out that footage entirely. I feel robbed!

[@gonedeadforlife]

they did show it towards the end pay attention

[@TonyBullard]

gonedeadforlife You got a timestamp? Cause I never saw it fall in real time.

[@gonedeadforlife]

Tony Bullard 4:13 they show it a little enough to see what it looks like

[@TonyBullard]

4 minutes and 41 seconds, and only about 3 quarters of a second, in a super wide angle, is at actual speed. Very lame.

[@WillRose3]

Completely agree. Right from the first second of the video, that was the footage I was waiting for. Pretty disappointing.

[@Flyghttt]

Who else is watching this in 2024 because your teacher made you in science

[@fromnorway643]

Not me, but it's not a bad idea!

[@00Linares00]

Everyone has seen an object in slow motion falling slowly, yet that's what you chose to show instead of the object that never falls fast falling as fast as a bowling ball. Good job.

[@mazeu9105]

I wanted to se how weird it would look if the feathers was falling fast, as fast as the bowling ball. But of course this was in slow motion.

[@chrrissss]

Mazeu here’s a similar experiment doing showing full speed kzbin.info/www/bejne/qWq9k2audsx8pbs

[@asicdathens]

it has been done on the lunar surface.....

[@Astrix_Jaeger]

set video speed to 1.25

[@Astrix_Jaeger]

oh wait 1.5 rather

[@Astrix_Jaeger]

forget it, i tried 2.0 still shit like my suggestion

[@WildPhotoShooter]

Thinking of how Newton and Galileo would react to this, seeing their lifes work in action, puts a lump in my throat , they were two astounding human beings.

[@atulyaaishwarya3550]

Well, they observed it right but explained it wrong. It was actually Einstein

[@muddyfunker3014]

I love this comment

[@lucaslinares7806]

Some day we will be able to go back in time and tell them 😉

[@WildPhotoShooter]

@@lucaslinares7806 Im sceptical about time travel, 🤷🏻‍♂️

[@emotionalvideos6897]

@@WildPhotoShooter it was not Galileo, he just copied it...

[@JavierBonillaC]

Not having this in real speed is the most frustrating thing that has happened to me in like 5 years!!! Imagine the chance of seeing a feather fall like a rock! Instead we get slow motion and the feather falling like we always see it falling.

[@profquad]

it's really driving me crazy

[@Satironical_Guy]

P.W. 🔥🔥🔥🔥🔥

[@MarcoAGJ]

The fact the second drop was shown in slow motion actually bugged me more than it should.

[@whatevernoticed]

its 2016, you can make the video run at normal speed yourself.

[@mikes899999]

It's 2017 ;)

[@enquire422]

Mikes8899 Earth is flat , BBC lies!

[@jacobe1942]

you never know, maybe it was sped up!

[@jacobe1942]

I am a free thinker like einstein. he would propose that if you can change the speed of the video feed then it is impossible to deduce what initial speed the ball was falling. perhaps without an atmosphere the pressure would cause gravity to have less of an impact, we do see the ball struck the card board at significant force though that is is probobaly not the case, but without a reference its impossible to say for sure. some other interesting observations. 2:53 shows 1 ball 1 feather starting to drop, then next clip is ball and like 7 feathers? ok odd..... then at 4:16 the feather shows much more wind resistance and the ball dropping faster than the feather. and then back to the 7 feathers and 1 ball clip. so badly edited

[@aaronclegg5696]

I teach 9th grade physics, and this video actually confuses my students. This film is the absolute best experimental demonstration of freefall's independence of mass, but it has one confusing point. The film shows the evacuated drop only in slow motion, never in real-time. As a result, most of my students believe that removing the air from the chamber makes both objects weightless and drastically slows down their acceleration. Even though I tell them repeatedly that the video is in slow motion, we know that students often don't listen to what we tell them, instead believing their eyes. Many of my students write things like this: "Reason why bowling ball and feather hit the ground in same time in vacuum chamber is because less air mean less force which seem like they standing stell and going very slowing down" [sic] This video would be much better for students if they first showed the real-time video of the vacuum condition before showing the slow motion video, just as they did in the first experiment (with air).

[@alexleibovici4834]

> This video would be much better for students if they first showed the real-time video Yes, maybe... However, the entire fall takes less then 3 seconds, so that it would be difficult to observe that the two bodies are perfectly synchronized all the time...

[@magoninhogamer]

just put a small piece of paper over a notebook, then drop them to the ground, the notebook will remove air resistence behind it and the piece of paper won't be affected

[@alexleibovici4834]

@@magoninhogamer > just put a small piece [...] And what will this prove?

[@supeskrim]

@@alexleibovici4834 The much lighter paper (feather) without buoyancy/drag coeficient of medium fall at the same rate as the much heavier notebook/book/object. If the paper & notebook is drop side by side the fall rate is significantly differ due to CD of medium. The same principle can be used to safe gas/energy by tailgating a larger vehicle or in race your opponent car/bycycle/etc, or bird formation for lengthy flight.

[@alexleibovici4834]

@@supeskrim > The much lighter paper (feather) without buoyancy/drag coeficient of medium fall at the same rate as the much heavier notebook/book/object. This is a completely different phenomenon that the one presented in this video. The one in this video is purported to show that the acceleration of a body does not depend on its mass IF the only force acting on it is gravity.

[@bablugupta78909]

Rajwant sir students mark attendance 😊

[@puck7364]

This video broke my tiny mind years ago, when I've first watched it. It was therapeutic. I come to watch it, whenever I need to get my feet on the ground since.

[@Elizah247]

It was an overwhelming feeling watching this

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@rajdeepchakraborty9533]

This is one of the most beautiful video I have ever seen. Years and years of humans pushing their knowledge just to understand the working of the universe in a much better way.

[@KissMyFatAxe]

And yet some people still claim it's all a lie and "fake news". Those people shouldn't breed.

[@attav8]

@@KissMyFatAxe it is fake lol

[@Based-Anti-Theist]

@@attav8 Dont breed

[@mikecheck1two453]

The feather’s move right as they are released, this is suspect. Why the slow motion and cut shots too? Man, show it in real time, uncut as well. Too many talented special effects folks out there to not have the uncut real time footage shown as well.

[@heldermonteiro2718]

@@KissMyFatAxe This test didn't answer the question if things are upside down how that things are attracted towards the planet

[@zeet7698]

It's amazing how a crazy scientist named Galileo gave this theory 400 years ago.

[@lucadipietro2310]

Actually the concept is obvious! But we can not see! Do you know how Galileo discovered this? Because he made fall a small iron ball of 10 grams and a paper also of 10 grams from the same high... and he saw that the ball still to arrives in the floor before than paper. So, this means that is not about the weight!!!!

[@thevigamerpixerlator]

@@lucadipietro2310 Of course its a theory, but that test didn't prove his thought that air resistance was the cause of objects falling at a different rate. The definitive test he made was to create 2 iron balls of different weights but of the same diameter. In this case, both the balls fell at the same speed and that's the proof that Galileo needed to show how the concept works.

[@jonahjerryson4913]

@@thevigamerpixerlator what is so bad if it is a theory a theory and a hypothesis are different

[@thevigamerpixerlator]

@@jonahjerryson4913 I agree, they are. A hypothesis is an assumption based off facts that you may infer to. A theory on the other hand, is a proven answer that is done through multiple testing procedures. That is literally what I was saying.

[@jonahjerryson4913]

@@thevigamerpixerlator oh sorry my bad

[@navyofficerina8923]

Kitne log yaha par Rajwant Sir ke kahane par aaye hai 😄👍

[@atulyaraj2040]

mera attendence lgao

[@ubaidullamueen3858]

RIP Rajwant Sir, such a bright soul. 😔

[@navyofficerina8923]

@@ubaidullamueen3858 Abe Bhai kya bole ja raha hai

[@ubaidullamueen3858]

@@navyofficerina8923 you didn't know?? He passed away today😔

[@navyofficerina8923]

@@ubaidullamueen3858 Bhai please Aise maat bol thik hai

[@ugtutorials315]

Thank you sir It helps me a lot to clear concept of gravitation in my class

[@rasithasenevirathne1604]

These guys who have been managing this multi million dollar structure are still fascinated by how this known principle of gravity works. That’s what I love about scientists. They are genuinely amazed by their field every time.

[@sharpuslf]

That is exactly what makes me suspicious. Their amazement would have faded away long ago, yet they pretend to be amazed for the camera. I get the host, presumably this is his first time...but the others? Seems odd.

[@rasithasenevirathne1604]

If you want to doubt it, y don’t you try to find out for yourself? Instead of taking the easy way out and leaving a comment on a KZbin vid.

[@sharpuslf]

@@rasithasenevirathne1604 Who says I am not trying to find out how this works?

[@albertraich3492]

I guess they a very tight schedule, and this is just a break for them of their daily routine.

[@rasithasenevirathne1604]

I’m not tying to argue with you. I just expressed my amazement. I appreciate your comments.

[@patroclus1729]

It's the most beautiful thing to watch, ball and the feather falling together.

[@syntheticmedic]

It would be if they didn't slow it down

[@syntheticmedic]

@Filthy Animal it's still slower than real-time speed

[@nishantsaxena5110]

That's just gorgeous, physics is amazing.☺️

[@kuhiibchutia8012]

PW 🙌 After abhisekh sir's class ♥️ . Physics is beautiful ♥️

[@dev__5848]

PW 🙌 After rajwant sir's class ♥️ Physics is beautiful ♥️

[@WRNWRW]

@@dev__5848 helo saaar

[@FleaOnPeanut]

All that work and you never bother to run it at normal speed. Which would sell the whole element of heavy and light moving at the same speed. In slow motion it just seems dreamy and unreal. I don't get why people have a hard time getting this. Show both slow and normal speed if you have slow motion.

[@therebel4332]

+FleaOnPeanut They wont show it in live speed because they can't. its a crock of shit and they know it which is why they are laughing their tits off. people have well and truly duped if they believe this crap.

[@FleaOnPeanut]

Ah, right. This is why I shouldn't post comments on youtube. Thank you for reminding me. For the record I do like this video, and my gripe was with a technical style choice. I won't respond after this comment. Take care.

[@DulksVenee]

+FleaOnPeanut The slow motion is there so you can clearly see that they are travelling and accelerating at the same ratio. And of course... for dramatic effect. I agree on that part that they should have showed it at normal speed at least once.

[@superbionicbatman]

+FleaOnPeanut Modern Science has to be fluffy and dreamy. Personally, I want real and I want facts.

[@peterjf7723]

+Andrew Jackson The bowling ball will fall faster in a vacuum than in air, both the feathers and the ball are slowed by air resistance.

[@HardayalSingh-tr8pm]

even though I already knew what would happen it still felt so beautiful

[@bryananofa7165]

Do you know its dangerous to be in a low room?

[@joeg5265]

The music

[@ChickenDeranged]

Still one of the best videos on YT and will be for a very long time!

[@user-kq1tz1qf8h]

дерьмо!))) 0=1

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@zehralalala]

film sahnesi izliyor gibi hissettim, mükemmel bir şey gerçekten

[@MadMonkey572]

>see video >looks interesting >click on it >see a comment I made >forgot I already watched it

[@arkie87]

forgot i already read this comment

[@Wheredatruth_at23]

Stop trying to greentext, it's not 4chan and it's so freakin cringey.

[@MadMonkey572]

>implying

[@202015spongebob]

+Cyrus Hinojos fr

[@anonymous7371]

Guy: This is NASA's.... I skipped the video

[@brucebaxter6923]

Amazing how slow the ball falls in a vacuum.

[@insidemechanics]

Haha

[@oreolamp5676]

Is this comment serious or not? The shot is slowed down

[@brucebaxter6923]

Eero L. No, it's not serious.

[@oreolamp5676]

+Bruce Baxter such sarcasm, much wow

[@brucebaxter6923]

QB Machine Yes, the ball is slowed by the vacuum so that it keeps pace with the feather

[@stone21island]

This video takes my breath away

[@dsdy1205]

I think what I love most of all is how all the seasoned NASA engineers are still nerding out about it. They put men on the Moon, the concepts involved in this experiment are child's play for them. But seeing a bowling ball and a feather fall at the same time, seeing that visceral smack of the feathers and watching the equations you use everyday come to life is still special.

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@rahulb.329]

Couldn't even insert 2 seconds of normal speed clip? Wtf

[@shanedonlon1039]

Rahul Bondar look for the full documentary idiot. You’ll find that they do show it at normal speed. Don’t Rely KZbin showing you everything you want to see.

[@vargasbasti]

kzbin.info/www/bejne/qWq9k2audsx8pbs normal speed

[@marvinmartinsYT]

Why do you need that

[@rachytony7827]

@LUNA GUEVARA hahahaha

[@rwood1995]

@@marvinmartinsYT because......... 9.8 meters per second per second ..... god dammit. The vacuum is to demonstrate gravity interaction in its purest form.

[@jerryross2]

? The interesting part of the experiment is seeing it performed in real time. Why on earth didn't your show the real time footage to show how quickly the feathers are dropping? - Physics professor

[@BobbieBees]

where's the fun in watching something go so fast that you'd miss it if you blinked.

[@neerkoli]

Bobbie Bees They can show the slow motion later, after showing the real time footage first.

[@IcedPlasma]

It's rigged pretty high up. The fun is seeing a feather fall as fast as a bowling ball.

[@jan-thijnwijnker6762]

Jerry Ross 9,8m/s^2 now happy

[@zammmerjammer]

+Karim You keep posting the same comment on every thread. So, listen up -- 1.37 seconds is PLENTY OF TIME. The human mind is capable of tracking motion that occurs over a second, ffs. You're basically arguing that if someone dropped something off the roof of a house, it's trajectory would be invisible to the human eye. The decision not to show the entire drop of both feathers and ball at real speed the whole way through is just baffling (and stupid).

[@abhinavtripathi6764]

after rajwant sir clsass

[@eMBO_Gaming]

I love how flat earthers in the comments can't process what happened here so they can't even decide if they should call it fake or invent some new mental explanation for this phenomenon

[@matteoo_bruno]

It's gorgeous how a brilliant man gave this theory so many years ago and without be able to verify it with such advanced tools

[@khuti007]

He was so brilliant that if you read his paper, he actually says, this is what happens but I have no idea why? He understood, that he didnt have it all. Einstein worked out why.

[@user-sj6vw2xo4p]

I am a science teacher in Korea. This video is amazing. I really appreciate everyone who filmed the video.

[@jenm1]

Hi, could you please explain if there is negative pressure in the surroundings when it's made into a vacuum? I'm confused on that.

[@hudson415]

닥쳐 한국어 여기 초밥이 없어

[@shivammishra-dk7bx]

Who has come after rajwant sir tell about this?😂

[@vrundashah2456]

mee

[@dev__5848]

Me here 😅

[@tlousel]

Özcan Aykın :)

[@BartTricas]

I wonder how much BBC had to pay to pump out the air for the purpose of this 4 min video clip...

[@AngelFaudoa]

Bart Tricas I asked myself the same question xD

[@befalcon9498]

Angel Faudoa Did you get an answer?

[@calmdown15]

Bart Tricas TBH it seemed like a waste pumping out 30 tonnes of air just to drop a couple feathers and bowling ball.

[@respeezy]

Bart Tricas Haha i was also thinking about all the costs, even when they closed those giant doors i was thinking about elecrtricity costs.

[@redtails]

Bart Tricas The electricity is irrelevant, the facility and the people cost the most!

[@nadadada9784]

The Music makes the experiment even more beautiful

[@haziblathif491]

Know the title?

[@manve5652]

What’s the song’s name?

[@siddheshvalantino8288]

Yes thanks to bbc

[@ChangWoo1]

I'm here thanks to my physics teacher. Mr.Aykın❤❤❤❤

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@Yunutuber-yunus1990]

Kütle çekim kuvveti, kütlesi farklı olan cisimler arasında farklılık göstermiyor mu yani ?@@davidmudry5622

[@sl1ker]

So simple, yet mind blowing

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@stvrob6320]

Wish they had at least one clip of the entire drop without slow motion video.

[@pranjalvw2193]

as an astrophysicist, it gives me immense satisfaction to watch our equations, postulates and study implements accurately as it is explained... Marvellous video... Hats off to BBC

[@Tom-qw8fg]

It's always nice when the equations WORK! As an amateur ballistician I understand your satisfaction!

[@womp6338]

"our" equations lol you mean Newtons, you didn't invent them.

[@rg5312]

They aren't your equations, you haven't come up with anything. BBC didn't do anything either, it was NASA that built the chamber, they were just allowed in to film. People like you are what is wrong with this world.

[@DeepSukhwani]

Just started reading Deep Simplicity by John Gribbin and searched for "objects falling on airless moon" and came right through to this video. Remarkable! Just fell in love with Science once again.

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@Aristothink]

From all physics experiments I EVER saw, this is the most beautiful and amazing experiment. Thank you so much Brian for such an amazing demonstration of the power of vacuum. 🏆🏆🏆🏆🏆

[@meerakrishna1668]

Was it provided that both the bowling ball and feathers had the same weight ?

[@Aristothink]

No, since their huge different mass is the essence of the experiment. The bowling ball is much more massive then the feathers, instead in vacuum they "fall" exactly the same.

[@sebastiannolte1201]

Power of vacuum? Strange view. It is just "nothing". So we just see gravity working in the vacuum experiment. It is the air that has "power" in the non-vacuum experiment.

[@Aristothink]

@Sebastian -> It all depends on the reference frame that you are. In a way the air has the power of adding friction with its particles, while on the other hand the vacuum "has" the power to remove all friction by the absence of any particle. The expression "power" was used in its philosophical sense, not in its physical meaning. It was just an expression of WOW, how amazing vacuum can change the behavior of objects...

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@cogitateandabet]

That put a simile on my face. The scientists didn't have this facility back then, yet they predicted it so correctly.

[@dvill2141]

❤❤🎉🎉🫦🤱👙❤️‍🔥💓💕

[@dvill2141]

God bless

[@pradyumn2692]

Yes. A lot of things were discovered like this. That's what makes science different from religion. It is specific.

[@hermanlauvehansen7825]

@@pradyumn2692 fax

[@floorboss]

​@@pradyumn2692Not necessarily, because "Science" can be very ambiguous. See the Covid 1984 exaggeration. > Science can be defined as A group of people in agreement & signing off on A paper that details the degree of consent. While another group can do the exact same thing, while detailing in their paper, A polar opposite conclusion. This happens all the time.

[@digitalArtform]

Incredibly annoying that they never show a full unedited real-time drop.

[@YINGAI1995]

ikd OMG I AM CRYING FUUUUUUUUUUUCCCCCCKKKKKKK!!!!!!!!!!!!!!!!!!

[@deanmuhl7417]

They can't because that would reveal their deception.

[@3styl781]

Is there a real time version of the feather and ball dropping, I think it'd be far more interesting for the viewers to see the feather drop at the same rate as the ball, not just in slow motion

[@superyeah4ever2]

that would be like an actual video now wouldn't it, asking for too much

[@hope12294]

Physics wallah 😂❤

[@ashishrathore5887]

Rajwant sir ne bola hoga 🤣

[@i.bhavv19]

@@ashishrathore5887 Right 😂

[@_samuelajayi]

Brought a tear to my eye. So beautiful.

[@fbk01]

özcan hocaya niye telif attınız lan AYIP DEGİL Mİ BİRAZ EGİTİM OGRETİME SAYGINIZ OLSUN 😡😡😡

[@TRY_TALAL]

Last words are amazing

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@ishansheikh3058]

I am an Astrophysicist and I know these kind of stuff very well. But still to this day videos like these make me cry to see physics at this best. Tears of joy rolling down my cheeks.

[@fromnorway643]

That reminds me of Apollo 14 astronaut _Edgar Mitchell_ who walked on the Moon in 1971. He said in an interview once that going to the Moon changed him from having an _intellectual_ understanding of the immensity of the universe and Earth's tiny place in it to having a deep _gut_ understanding of that.

[@AlexZander688]

And then you see flat earther cultists and their failed flat earth model nonsense and it brings tears rolling down my cheeks from comical laughter.

[@merihim666]

can u explain me why feather moved it "hair" at the beggining of falling down? i wonder

[@VivekanandaKF]

@@merihim666 I notice this detail and I don't have an exact answer, but I suppose that this is due not being a perfect vacuum. Editing: found another 2 comments here: 1) "Inertia." 2) "For every action there is an equal but opposite reaction. As the feathers accelerate from zero the parts that you see move are actually still standing still until they are acted upon. While it looks like they are moving up they are actually being pulled down. Once all parts of the feather reach the same speed there will be no movement." My conclusion: the feather is not a rigid body, and the feather undergoes sudden acceleration. The softer parts are flexible, and react to this.

[@SuzukiKid400]

@@merihim666 it’s not a perfect vacuum, there is still a small fraction of air in the chamber causing small amounts of feathers to flutter

[@_miisty6467]

I found this video's link in my 10th physics text book , this is the first time when i felt that physics is so interesting .

[@siddheshvalantino8288]

Bro sister i found in my 11th book page no.79 samachher book tamilnadu

[@SOULPIANIST]

Who is here after Rajwant sir?😃

[@Satironical_Guy]

P.W. OP❤️🔥🔥🔥🔥❤️❤️

[@SOULPIANIST]

@@Satironical_Guy yup

[@mayankpal5389]

Me

[@pallavisharma2332]

Same here our teacher suggested this video.😊😊

[@TheLyricsGuy]

I get seeing it in slow-mo, but why the hell would the editors keep the viewers from seeing the whole drop at full speed? Wouldn't seeing a feather drop that fast next to the bowling ball be one of the best parts of this experiment? Not really sure what they were thinking.

[@jaybluff281]

Because it's a preview clip and they want you to watch the whole show.

[@wtfvids3472]

a "preview clip"?? at the end??? cognitive dissonance 101.

[@jaybluff281]

Which part of the concept are you struggling with? That this clip is an edited down preview of a 60 minute show or that it's edited to entice you into watching the other 56 minutes?

[@TheLyricsGuy]

Unless I'm wrong, I didn't see it in the full version either.

[@wtfvids3472]

+Jay Bluff What are you talking about, even if that was true why would they show the balls falling at a different rate after they have shown them fall at the same rate just before... Use your head. Don't just kneejerk away anything not fitting your preconceived belief system. Did you even see my video??

[@spreadlove8624]

We have people like these doing amazing things and then we have the flat earthers. The quality of human is so inconsistent.

[@evolicious]

I don't think we should consider such a high-praise as to call a "flat-earther", a human.

[@jam22bear43]

Flat earth is psyops so you can lump them in with people who have legitimate questions. Id like to se them shoot a rocket in there hanging from a string

[@edfae3021]

the quality of human is also subjective. im sure as far as the universe is concerned both flat earthers and physicists are both equal and merely different

[@Will91289]

and we have religious fundamentalists, especially Islamic ones, who want to destroy science.

[@jam22bear43]

Ya we have people asking questions of the established world view kinda like martin luther newtom and people like the founding fathers! I dont. Believe in flat earth but asking questions does not make you a lesser human in fact it can make you a great human you negative troll!

[@user-yg6ic1wm6m]

One of the best observations

[@davidmudry5622]

IF, you were inside this vacuum chamber and you wanted to first toss the bowling ball and feather up to the height where they fell from, then obviously the Force required for the upward proper acceleration on the bowling ball would need to be much greater than the force required for the proper acceleration on the feather. After they reach the same height they fall at the same rate regardless of their masses. That is because there is no force downward when an object is in the coordinate acceleration of free fall. The same experiment can be done in an accelerating spaceship.

[@thirupawar2577]

I still watching in 2022... finally I clarified my doubt ❤

[@lovegachafox09entj31]

POV: your on a teams call and you were set to watch this....

[@emmc2]

Yep

[@Jamesfeldburg]

Yep

[@lucabralia5125]

nope, the algorithm brought me here

[@BestGamer-mk6vs]

lol, yh

[@simplygreat2483]

Lol

[@rattywoof5259]

1:03 - love the way the subtitle writers have capitalised The Force! May it be with you all.

[@KeepCalmandLoveClassics]

Simply Breathtaking! 💜

[@subhashdhundhara7159]

THIS IS MAGNIFICENT

[@toast1589]

Physics students after neglecting Air Resistance and seeing this video: This whole operation was your idea, don't blame me!

[@PatriotPits]

Air resistance doesn’t play a factor, does it? Clearly this vid shows that it does. But I was thinking about flying from the equator over the North Pole and back to the equator on the other side of the earth. The plane took off we a relative speed of the earths movement at 1000 mph, some how slows down to nearly nothing at the North Pole then manages to regain that lost speed? Also on take off the plane is getting the rotational force of the air on one side of the plane, then once past the pole it’s on the other side of the plane. Do we just not fly over the North Pole due to this? I see pilots keep it simple and assume a “flat and stationary earth”. How the heck can they do that if the atmosphere is moving one way then the next once over the pole? Just trying to learn here. Thanks

[@siddheshvalantino8288]

Yes how u gessed me i would partner to galileo !

[@Team.Louish]

Wish I could of seen it at normal speed.

[@solaaar3]

+Clint Decker (Louish) you can a bit at 4:16

[@AuroraNora3]

Grrrrrrrr >:( Could have*

[@davisbender6337]

+Clint Decker (Louish) just watch the video at 2x speed lol

[@StanSylvania]

+Nice Try M9 the ball falls faster and the feathers are moved by air at 4:16 watch closely

[@Team.Louish]

+Hoo Dini I hate when I do that.

[@gagansingh7853]

Rajwant sir op❤️🔥

[@imahmud]

I love these kinds of experiments.

[@PathanPhoto]

I have watched this video numerous times and it still makes me smile and wonder when I see it again. Absolutely brilliant,

[@AkashKothawale]

If this makes your smile, you love science.

[@bangladesh1210]

Rajwant Sir ke bolne ke baad kon kon aya video dekhne Attendance lagao😁

[@harshh8877]

😂

[@ad1tya9]

Me😅

[@swapneelmohanty3924]

Me..,

[@karanveersinghsahota5731]

me too

[@vitaminprotien69]

Me😂

[@Kidneyseller20]

The fact that everyone knows the results but still they react after watching that makes me happy

[@fromnorway643]

Understanding the theory is not the same as seeing it with your own eyes, even for scientists.

[@Kidneyseller20]

@@fromnorway643 ya :), but they must have seen it already with eyes and then again tested obviously!

[@fluffyvampire2046]

This video was my inspiration to science when I was in middle school, now I’m physics student & I’m welling to complete my studies on this major ♥️

[@manish7512]

I want to see feathers falling at actual speed, not slow-mo

[@ritusachan115]

They would fall with high speed in the absence of air i.e in vaccum

[@alexleibovici4834]

> actual speed, not slow-mo With the actual speed, the fall takes less than 3 seconds and one sees very little.

[@sultans1377]

Nasa from CGI to SLOW-MO

[@ivan_ayala4971]

same bro same...

[@Zeback119]

Who else is watching this in 2023 - suggested vid by your physics teacher 🌚

[@trigerredpanda]

Rajwant sir op💛💛💛💛

[@tcreate.s]

This host's delivery is phenomenal sounding, great storytelling!

[@abel9351]

i loved physics in high school and college. im now a doctor and searched this up out of curiosity. i started crying cause of how beautiful this is

[@TradingJesus]

you cried cause you chose the wrong career 😢

[@sweenytwain7095]

Lmao... You cried over this garbage??

[@omarabdelghany7248]

L

[@mcdk5646]

@@TradingJesushow ?

[@mcdk5646]

@@sweenytwain7095how’s it garbage?

[@timp1293]

We did that experiment in high school with a small vacuum tube. NASA did it in a huge vacumm chamber to prove the point that they have an enormous budget

[@UpsFattehpur]

Who has come from science and fun

[@NAMANFFYT-vc5im]

Me bro 🤜❤

[@user-pv5fn5uj8w]

Me also 😅😂

[@keymaster4426]

me

[@leokimvideo]

this video sucks in a very good way

[@jorge21cod]

It's becuse the machine is a vacuum

[@BigOlSmellyFlashlight]

leokimvideo holy shoot

[@hotmojoe2483]

god dammit

[@solstice5599]

NUKE did you not get the joke.

[@jackgoff5174]

NUKE you’re not very smart are you?

[@math4fun]

It's incredible how the human mind forget things along the time...For a couple of moments I had forgotten that objects accelerates equally to the ground in a free fall, independently of its mass - and it's more unbeleavable recognise it's exception.

[@user-eb4so5pr4w]

one of the most impressive physics experiments

[@VanshSharma06]

Suggested by tuition teacher, amazing video n very helpful

[@haushofer100]

Cox's remarks about the equivalence principle in the end are confusing. Of course the ball and feather are not "standing still". They're falling. But according to the equivalence principle this is locally indistinguishable from as if (!) the objects are standing still. The "as if" is crucial here. The same goes with other inertial forces. Accelerating observers can describe deflecting objects in their frame with newton's laws AS IF there are forces acting on these objects (which, for inertial observers, would move in a straight line). But really, the force (e.g. an engine) is acting on them, not on the objects.

[@NOMADdaf]

I agree. He totally misrepresented Einstein

[@hongry-life]

What if the objects WERE standing still? Many possibilities in media circles and maybe he doesn't lie.

[@celesteceleste6670]

any links for more info on this?

[@youssefbalhas1219]

I came to the comments to find an explanation about the last part because i found it confusing too.

[@anthonypape6862]

Agreed. Einstein was merely saying which objects were falling, and which were not with no frame of reference would be impossible to tell. They would only be moving relative to each other. Or more specifically the man in space being picked up by an elevator that accelerated at 9.8 m/s^2. Would cause the man to not know if he entered a gravitational field or if he was being accelerated by the make believe elevator. As to why everyone is obsessed with dropping paper or whatever and that this was some how faked is disappointing to see. It doesn't matter what you drop. They took all of the air out. Drop a dude with a parachute it won't work. I sure hope NASA didn't spend millions on this vacuum chamber to simply fake experiments.