Bernoulli Effect - Science Theater 17

[stefanomunibez]

Fag

[SinnerByAnyOtherName]

Ummm, bernoulli effect with blowing along the top of the strip of paper - minor .... entrainment is the main effect.

[sciencetheater]

@SinnerByAnyOtherName I'll grant you that... very minor... but blowing water through straws to get your table-mates wet? ... priceless...

[Gruppy13]

3:58 the new way to tepee a house!

[szczepansky]

If the pressure is lower on the side the air moves faster, why doesn't the opposite happen if you blow UNDER the piece of paper?

[sciencetheater]

@szczepansky Hmm, it should be the same effect, it is drawn downwards... but it is already sagging down... try it with a stiff piece of paper and it should be pulled downward I think...

[szczepansky]

@sciencetheater Have you tried it with a stiff piece of paper? No appreciable force to be found. When you do it over the floppy piece of paper you're not seeing the Bernoulli effect. The fast moving air is exactly the same pressure until it reaches the curved surface. Bernoulli's principle only describes the same bit of air as it moves.

[sciencetheater]

@szczepansky Hmm, interesting. I could concede that. I'll have to think about it and toy with it a bit... (It's such a fun effect, but its a bit dicey to try to popularize since it is actually a bit technical in the details...)

[abcde401]

woww this guy is such a noob. he cant even explain why the effect takes place...

[sciencetheater]

@abcde401 Heh. When it comes to understanding the entire universe, I'm comfortable with being a noob. Of course, understanding and being able to explain at an appropriate level are two different things....

[abcde401]

@sciencetheater u did a great job of relating the principle to our everyday lives, but not really explaining becuase the principle wasnt really explained.

[Valzz99]

So simple and easy to understand, your enthusiasm puts a smile on my face. Amen you to you and Bernoulli. :D

[ShadowDarkness900]

wow great video

I seriously finally understand how planes fly. for real.

[xXShockSetsInXx]

3:33 - you're welcome. :'D

[haloreachpwns]

What material did you use for the Blowing in one breath thing that was awesome

[sciencetheater]

@haloreachpwns It is a simple little tube of moderately thin plastic... you can find them in educational catalogs... Sometimes they inflate them, tie them off, and let solar heating make them lighter than air so they float...

[jbbabeful]

nice shoes!

[OldSchoolSkill]

Great demonstrations! 

[lauwelaukoen]

dus dit moeten we voor school kijken?

[SkydiveSabotage]

This explains the phenomenon of ghost balls.

[dave8386]

I just have one question - although when you blow along the piece of paper, you have less air pressure pushing it down, doesn't gravity take a part in the equation? Gravity should still pull that part of the piece of paper down, right?

[sciencetheater]

@dave8386 Yes, gravity is still pulling down. However, the Bernoulli effect is able to overcome it, just like gravity pulls down on a plane, but the wings of a plane are pushed up by air going by that it can overcome gravity and go upwards...

[LFchinatown]

@sciencetheater I went to a Blue man group show when they came to my town and one of the things they did when they shot confetti all over was they shot toilet paper into the crowd just like you did in your demonstration. They had four industrial fans with angled pipes that they fit rolls of toilet paper onto for the sole purpose of shooting toilet paper into crowds using the bernoulli effect.

[justamar]

why are you such a thug man, i was reading this in my book, and you explain it within the first 30 seconds.

[ZealousKiler]

thanks, i knew about the ping pong ball being stuck in a tube, but i never knew that it wouldn't fall out upside down :D

[emexholttt]

im in respiratory therapy school and this really helped me in relation to how a large volume jet nebulizer works! thanks!

[zengrz]

man thanks for the video

[glowingdarkmatter25]

awesome..

[SkyHiRider]

Really a great video, wish I was paying more attention at school, could have learned a lot of cool stuff.

[McSassy328]

Ahhh fun! I wish we had access to these types of materials in our classrooms. Thank you for your demo!

[rahulmdr24]

this is awesome i wish i was half as smart as you mate.

[88Kamikaze69]

I gotta tell you man, I wish I had a teacher like you when I was a kid, I might not have ended up being the smartass under achiever that I am today ^^

Just so sad that you have to grow older before you really realise how much potential you wasted as a kid not paying proper attention in school :/

Keep up the good work man, if you use this kind of teaching method and enthusiasme (<spelling error?) in class your students should turn out pretty good ^^'

[sciencetheater]

@88Kamikaze69 Thanks for the compliments. I try to keep up the enthusiasm at school although it is trickier to do it 3 or more times per day.... :)

[Ufailzful]

The Name Bernoulli Sounds better in french (:

[ToddWRC]

BERNOULLI EFFECT ie fast air = low pres.

[maco10810]

Nice - look into air enhancers - repace the air with liquid propane in a stainless steel version and you could have a cheap jet engine - or at least a good induction system into a pulse jet engine.

[AQlegacy]

I need bill nye vids on FLIGHT .specifically,ANGLE OF ATTACK

[AiyanaRaWrStumpWentz]

We watched this in 4th hour today!! :)

[A1n3dr5e1234567890]

00:31 The air tends to keep on the surface due to viscosity , and pulls the paper up.

1:10 The air flow do not touch the cans, it is not Bernoulli, what happens here is just the air nearby the flow tends to be carried out together due to the viscosity , and it generate another flow towards the center.

2:00 The same as above. The air viscosity carry the air nearby together.

3:00 Coanda effect.

3:50 The paper lift due to viscosity of air on it´s surface.

Bernoulli do not explain lift.

[sciencetheater]

Thanks for the more precise clarifications. The Bernoulli effect is very complicated and my goal was to introduce it without becoming too technical.

I'm fairly sure viscosity is not what you would term the reason air stays on the surface of the paper and I'm nearly positive that viscosity is not going to be applying a motive force. (It should nearly always apply a resistive force...)

I'm unfamiliar with the term Coanda effect, but will check it out.

[OmegaStryder]

hahah, I knew it! That was filmed in the PHYS building. BOILER UP!

[sciencetheater]

Yes, they kindly let me use many of their demos. I tried to find the best ones and explain them...

[scorinaldi]

dude this is awesome

[x0xlisaroxx]

thats not helpful!!!!

[sciencetheater]

sorry it didn't help. To explain it in any more detail would take a bit more time than I have in such short episodes...

[lemunadas]

Love the green shoes and the 1980s intro. Thanks for sharing.

[zepoe]

thanks!

[howarthc]

He certainly is "down with the kids".

[mravoqdec]

Go damn It!!!

You are CRAZY !!!

Thank you!!!

Nice work.

[JTehAnonymous]

Thanks for the video! It really helped!

[ISIpaki]

Very nice explanations. good work. keep it up.

[chuming123]

Really cool

[addieroxrev09]

i wanna try the last one with a hair-dryer. i bet i could do it.

[PATHABE]

hahah this guy gets excited when he sees toilet paper fly

[deviljabberwock]

Thanks for the helpful video :)

i wish my physics teacher teaches like this

[HOLAPATRONA]

YOU'RE AWSOME

[tubefreek13]

wow!

i have a p.e studied exam tomorrow and this will REALLY help!

thanks alot

[ashmaan96]

the guy kinda looks like matthew perry

[silverfuryranger]

awesome vid! Thanks!

[pilotfreak]

hi,

the example with the paper MUST'N be axplained by the Bernoulli Equation his what D. Bernoulli said about fluids/gases. Actually you have to use the Navier-Stokes-Euquation, one of the three fundamental laws of Hydrodynamics. So many Times this is explained wrong!!! terrible!!!

Nevertheless a nice video ^^

Alex

[sciencetheater]

Thanks for the clarification. If I recall, in my research for this video there were numerous mentions of the pitfalls of trying to apply Bernoulli's equation to airplane wings.

As is true with most things in science, some of the simpler demos are more complex than they look and are not always a "pure" example of a desired effect.

[pilotfreak]

yes thats rigth and i am happy that someone tries to bring physics to people ^^

5*

alex

[wingsfan2520]

I'm in flight school and the book I was using to understand the Bernoulli doesn't explain it too well. This was extremely helpful! thx

[sciencetheater]

Glad to help!

[DEdesigns57]

keep the videos going man!

[EagleDestiny]

thanks for this video. im studying about bernoullis principle in my engineering degree and this really helped me get a better understanding of bernoullis principle.