Understanding Bernoulli's Theorem Walter Lewin Lecture
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- Опубликовано: 11 сен 2024
- Understanding Bernoulli's Theorem Walter Lewin Lecture
bernoulli's theorem
bernoulli's principle
bernoulli's equation
application of bernoulli's theorem
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bernoulli's theorem in tamil
bernoulli's theorem class 11
bernoulli's theorem class 11 physics
application of bernoulli's theorem class 11
state bernoulli's theorem
prove bernoulli's theorem
bernoulli's theorem video
bernoulli's equation problems
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class 11 bernoulli's theorem
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Understanding Bernoulli's Theorem Walter Lewin Lecture
rayleigh scattering
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This is one of the best teachers I have ever seen. This guy really has a gift.
Except for the fact that he sexually harassed female students.
@peterzwegat9917 yeah people forget that. Still, great teacher
Professor julius Sumner, greatest physics teacher I've known.
@@peterzwegat9917this man is one of the best at explaining concepts so everyone can easily understand them. There we go.
@@tjweav1331 He also sexually assaulted students. Let's not just brush that under the carpet and let his work overshadow that
I’m a PhD candidate who has studied fluid mechanics and aerodynamics specifically for around 4 years. And still I don’t think I would have ever thought of such a brilliant experiment. The narrowing of the cross sectional area between the ball increasing the speed due to conservation of mass flow rate. Then this high speed out leading to low pressure, which is lower than the pressure inside the tube with slower air causing suction… just brilliant. I understand it all but that’s pure creativity to devise such a demonstration
Blah blah blah... magic. Yall just some magicians that lie about it
It helps for someone who dyscalculic like me.
I think you're doing great.
@@redseaford9426 Honestly these magicians are just making papers and yapping rather than making more magic..
Not to mention, with commonly available and inexpensive items.
Basically the ball is experiencing lift on its surface.
no its not. its experiences a downward force
Basically this doesn't mean anything
@@aicy69 I think the ball is experiencing lift (in all directions) on the surface that comes in contact with the flowing air, resulting in pulling it inwards. This is exactly why the ball is not falling down when the funnel is placed upside-down.
@@Verton_D yes thats why i meant. i meant the net force is downwards on the "ball" towards the funnel. i didnt mean down as in minus y Direction. this is because the air above the ball tries to rush to the area of low pressure and as a result pushes the ball with it
Lift is a really general term. Any force against gravity can be termed as lift, most used in a aerodynamic sense. The net result here is indeed lift, but a lot more is going on here. But to understand it, there is a low pressure in the nozzle where the air is moving faster, when it exits nozzle, it slows down and pressure increases. Now the higher pressure in the cup region, pushes ball into the nozzle. This is the lifting effect
Quality teaching needs to return.
It never went anywhere. This is pretty standard for a level 100s physics class.
To... Return? It's here as much as it ever has been. Most teaching sucks, some are incredible.
Where teachers are allowed by the administration, teachers, and governing boards, it's still very much taking place.
My physic teacher was boring and she made a quiz on this.
The experiment was an MCA with diagrams and I chose the wrong answer.
Lesson learned 🤣
Try actually going to college. You will find amazing educators at all levels. From community colleges to elite universities.
Thing is, this helps nothing with actual physics, just a fun gimmick...
This professor is loved so much in India. He is awesome. I watched his most videos available on internet.
He put his mouth on the same place she put her mouth without cleaning 👁️👄👁️
That's an indirect kiss👁️👄👁️@@Machoman50ta
Stop committing immigration fraud
Yes @@Machoman50ta
@@Machoman50ta So? Does she have herpes or something?
To blow; one must suck first. -Mos Q. Uito
Okay 😂😂😂
Giggity🥸
Sounds like my wife words!! Suck first, then expect to get a blow 😮
Massimoto Musashi probably
That's an AYO
Tell me you’re Dutch, without telling me you’re Dutch
Yeah, Dutch accents kinda suck
echt he
I'm not Dutch
@@mikealjohnssonwhy? They sound perfect to me.
I have a goddamn plan Arthur!!!
This is the reason you're not suppose to stand close to the train when youre on the platform
You'll get sucked in right? I am learning.
@@demogladawar yes
@demogladawar nope, that is a myth. Watch more mythbusters.
That being said, it is still dangerous to stand next to a railroad track. Don't do it.
@@jedh3721thats not a myth its just the pressure difference created is not that strong to pull you
He sad it needs to be at high speed ( => dependency of velocity), so a train stopping next to you has almost no effect. This means one rushing through will do the trick
I’ve been seeing a lot of these lecture shorts recently and liking them (I’m a physics teacher). I’ve got a ton of them now in a bunch of different topics for ideas that I can use in my classroom. It’s my goal to make interesting demonstrations like that so that my students actually enjoy my class. Unfortunately this topic specifically isn’t taught in the curriculum that I am apart of. However, I also teach an elective physics class where I can teach whatever the fuck I want. Bernoulli’s principle has so many applications and different ways of demonstrating it that I could probably spend 2 weeks alone just doing fun experiments with students
When a professor sounds like this, you know you're about to really learn the fundementals of a subject.
He sounds like all my teachers. That flat Dutch accent😂😂
@@mrfarax4944i hate the accent most dutch people have while talking english. But apparently americans thinks its a good accent
@@ReflexBeatsyou must be Dutch then :D ik heb lang genoeg in het buitenland gewoond dat ik eraan gewend ben 😅
@@TeeheeTennessy Jazeker hahah. Gelukkig hoor je bij mij niet vaak dat ik nederlands ben, zal wel wat met mn brabantse accent temaken hebben. Volgensmij is het accent dan minder opvallend in het engels ofzo. Of van het vele gamen en youtube kijken in mijn jongere jaren😂
Glad the 90s still had teachers like this and I was fortunate enough to have had many.
I hope you weren't harrassed
70's and 80's for me. Had many bad and lazy teachers but enough great ones like this guy.
There have always been teachers like this. It's weird how people think there is just WWII, the 80s and today. Humans have been teaching since... ever.
@@Wiziliz tf is wrong with you that that's your reaction to this????? i pity you, seriously. you'll never know true happiness. that saddens me. now go find your safe space and journal about the bad man that verbally assaulted you today
This is the best intuitive explanation of how air pressure works, that's awesome!
Intuitive, sure. But the most impressive demonstration of this is the use of the right handheld compressed air jet generator (thank RUclips for the translation 🙄)... and a screwdriver with a handle of the right shape.
~100 psi and the right angle will suspend the screwdriver in the air stream for as long as there is air flowing.
Professor definitely knows wise words
Yes like the wise words "I am not a magician" right before he proceeds to trick gullible ppl by proceeding to suck on an inverted funnel!
Does this have to do with his incidents?
Huh suddenly I understand how some of these catheters I use in the lab to suction out clots use the bernoulli principal... I've read it uses it, but this is the mechanism!
He talks like my buddy does when he gets strung out on speed and hallucinogens 😂
Prof said "blow, harder!"
This has also been used for designing cars for motorsports, the faster the air under the car moves, the more the car gets sucked to the ground, although they call it ground effects.
We've all known Bernoulli's principal since we were kids. A drop in pressure means an increase in temp. If you use your mouth to cool something off, you tighten your lips and blow hard, high pressure, low temp. To warm your hands, mouth open blow slowly. Low pressure, high temp.
No, is totally the oposite... Low presure=low temp and high pressure=High temperature. It is basic knowledg about the cooling cicle.
Your example about blowing is based on the wrong aunderstanding of what is happening when you cool down something with your breath....Btw Bernoulli's principal relates speed and pressure of a fluid not presure and temperature.
Ok
@@Maximus_sapiensYes. Blowing aids evaporation which releases latent heat of evaporation. Same as wiping your sweaty brow which removes some of the insulating layer of sweat, aiding evaporation.
@@36on22 What you say has nothing to do with what I said...which means you didn't understand it either...
@@Maximus_sapiens Blowing also removes body heat at the surface and replaces it with cooler air. I'm a retired hydraulic engineer, have used and taught fluid mechanics (including the application of Bernoulli's equation) for more that 40 years, and given expert courtroom testimony on the subject. Z + P/u + aV2/2g. And yes, I understand PV/T and PV=nrT as well. Peace.
Perfect demonstration of barnoulli's principle ❤
Birnoulli's
Barnelli's
Barnilis
Barnyard's principle.
The principal Barn Owl
Greatest physics teacher in the entire world ❤ I wish I came across your videos back when i was studying physics..
Hey, so ... fun fact. This is why the barrel of a gun has to be tight at the end. And why when you cut threads in it for ... say a suppressor, and accidentally cause barrel spread at those end threads, it can cause a loss of accuracy. Its not because of the attachment at the end, but because there is a nut that "pulls" the threads toward the end, which spreads the barrel a micro fraction and causes bullet drifting.
To fix this, you have to ensure the threaded end of the barrel is never pulled but instead is clamped down. Its super subtle but can really cause a lot of hidden issues at any series distances.
It's actually because the thread alters the end of the bore unevenly.
Not because it pulls anything.
If it pulled the end of the barrel evenly there would be no effect.
@@bobkoroua at the highest levels of precision, threading the barrel for long range rifles (minimum 1000 yards out to a mile or two), many rifles are threaded for two reasons: suppression and muzzle brake. The method by which these are attached is known to pull and spread the end of the barrel up to several thousandths of an inch. This causes a slight loss of velocity, but more importantly, produces a slight uneven pressure that allows the bullet to be pulled into or follow a rifled groove instead of being supported through the entire length of the barrel. This can be insignificant, or... sometimes, can cause up to several moa's difference for seemingly no reason. If the nut is backed off and everything reapplied without tension on the barrel, then this can fix the issue.
Its not well known, but it is a precision rifle issue that exists and which has been known to cause a rifle that shoots .25 moa to suddenly shoot up to even 1.5-2 moa. Check out the wolf precision out of PA stuff on this. They have a patent pending to fix it with a redesign of the end thread attachment point.
Unevenly spreading might also be part of it. But thats not how it was described during the analysis i was following of this particular problem.
It's not well known because it's not real.
@@wolfsiejk as i said. Wolf precision out of PA did a small intro on this because they have a patent pending to correct it.
@bookworm8415 have fun with PA, I'm going to stick to my own profession.
Same principle occurs in a plane’s wing. As the same amount of air must flow before and after the wing, the air flowing above the wing must go faster than the air flowing below due to wings geometry (the upper part of the wing has more area, so the air going up must be faster than the air going under it). As the teacher explained, higher velocity creates a decrease in pressure, therefore there is a resultant force upwards the wing which is the force that keeps the plane on the air (Bernoulli’s principle)
Important to note that it's the air under the wing pushing the plane up. A vacuum does not "suck" things in, it's the pressure outside that pushes things towards the low pressure.
This understanding of how lift works has been conclusive invalidated. The present understanding is : lifting wing efficiently accelerates downwards an equivalent mass of air as the flying object it carries as it travels through the air.
@@visionearthcare Your explanation is equally wrong though, neither effect by itself explains the total lift generated. And both effects cause lift. And it's not really a new discovery either.
He still uploads to RUclips to this day. The man never stopped teaching.
legend
Omg i took 1 sem to fully understand bernoulli and this dude explained it in a 5 second shorts.
Need physics teacher like him in my school 😢😢
جميع التجاريب الصفية متاحة على الانترنيت .. مشكل الطلبة انهم يريدون الواجد
He sexually harassed his female students unfortunately
This is MIT course .yes a rare youtube where academy topic explained as sophisticated point . your could find equation of fluid mechanic starting at Bernoulli. Most of classical book showings that 2 phase , idea phase (like video ) and mathematical symbolisation phase ,2nd phase required knowledge entire mathematic to understand. Well honestly, my university, my high school dont even go further than 1st layer , i heard that not in vietnam, Asia,india, developed country still existed a school like this .such a waste of time !
@@jamelzahi2085это не проблема студентов , это проблема тех кто хочет их научить .
Tbf to your teachers, you just saw the most interesting minute of a 90 min lecture that consists mostly of math which you would find incredibly tedious and very difficult to understand.
This also goes right along with the Venturi effect, as used on older vehicles' carburettors. There is a bowl of gas at the bottom of the carb, and air being sucked in by the cylinders through the carb's barrel, passes over the venturi opening at the middle and bottom of the barrel, draws the fuel up the small tube that starts in the fuel in the bowl. Fuel injection on the other hand needs a high pressure pump!
Is what I thought would be a good case for the whole 'can a fan on my boat blow my own sail' series of debates
@whatthej
That worked for WILE. E. COYOTE with a skateboard.
Sorry, but I couldn't help myself.
Bob. Australia.
Doubt there’s many teachers like that anymore. Definitely a great teacher.
Wow. An actual teacher. He’s not teaching the test. He is teaching the lesson
This is a great example of science. Bernoulli equation was my favorite in college studying hydraulics.
Yes. Used extensively in hydraulics.
Same here learning aircraft hyd system theory.
Such teachers are needed 😊😊😊❤
Well that's the difference between teachers and professors
If you take away the SH he did then yea
Ones that put their mouth where their students did?
5 minutes before this the professor said, "aight now I need a volunteer to blow a ball."
😂😂😂
💀
😂😂😂
"or you might aswell call it sucking"
Don't worry, you will just need to suck a pipe!
This is probably the best demonstration of Bernoulli's principle ive seen
I love teachers/professors so engaging with students
He just wanted an indirect kiss😮💨
😅
Kansetsu kisu!
Is that an indirect kiss
For a 10 year old watching this video, yes.
hawas ka pujhari hau tu
Only if you're a shy virgin Japanese main character.
What a loser 😂
Why you do hard up?
This is the reason the shower curtain tries to give you a hug when you first turn on the water
I thought that was hydraulic venting via the drain creating a pressure differential on side A of the shower curtain relative to side B.
Coanda effect
Isn't that just the air warming up, rising and escaping over the top of the curtain, causing heavier cooler air at the bottom to be sucked into the showerspace, dragging the curtain along at the bottom, which is also where the curtain has the most freedom to move
That’s a convection current.
I wet the bottom of the curtain and the edge of the inside of the tub so when the curtain sticks to it, it pulls itself taut instead of constantly trying to wrap me up haha
I had a science teacher a bit like him. Very eccentric and for the last day of school every year he had another teacher break a cinder block on his chest. Mr Curry was his name. I was a troubled youth and he’s one of the only teacher who ever broke through to me. I’ll never forget him.
The type of teacher we need in all our schools
Now i understand this intuitively, thanks
"Why don't you sit down" "Ew." 😂
Took just a few seconds to realize the prof is (originally) Dutch.
yeah he still has a slight accent
This is the kind of DYNAMIC teacher children need! He’s energy is like a rollercoaster so you have to follow along for the journey! Amazing teacher
This is an excellent Professor because of his entertaining aspect of the science, gaining knowledge is a BLAST 🌠
That's the way to teach physics and in fact any subject
Sir walter did her dirty 💀
🚨
“Why don’t you sit down” hilarious
So this is why my physics class sucked. Teacher only read a book and expected us all to already understand what the book said. I love this man.
If I didn't like this guy so much, I'd make a "this guy blows" joke....
I first saw him decades ago on TV. He has a nack for teaching principles that are easily remembered.
Being able to demonstrate the science youre teaching is the best trait a teacher can have, i will never forget the teacher i had first year of electrical engineering for that reason
This just gave me an insight to maximising port efficiency on engine cylinder heads
Physics prof: "I'm not a magician"
Class: "You wish."
Where are the applause? This guy is a great teacher
it's not a trump rally
People should understand how this theorem applies to changing radius inside blood vessels and gives us Poiseuille's law (pressure on a cylindrical tube as a function of the cross sectional area and length. When you combine things Boyles Law (volume inversely varies with pressure), Charles Law (Volume and temperature, or estimating with the Ideal Gas Law, along with material tensile strength, explains why blood pressure is so important. Its why a change in body temperature, causes a change in blood volume, and a change in volume means a change in pressure. Especially relevant to vessels like arteries that have muscles and can get a lot smaller, or a lot bigger to control flow.
But when pressure gets higher and the vessels are already enlarged to try and lower pressure, the heart can pump more blood out to veins, which can hold around 2/3 of the bodys blood volume. But then when it cant do that...there is nowhere else for blood volume to go: the heart itself has to expand. The stretching outward of the heart, thins the walls and makes them weaker, but most importantly it stretches the nerves inside the walls of the heart...making them fire inappropriately, which is what a cardiac arrhythmia is: a nerve in the heart firing and contracting the heart when it shouldnt.
In addition, the heart has to beat against all that blood (afterload) and just like any muscle, the more it has to work, the bigger it gets. This is when you get heart failure.
Wish I had teachers that still seemed excited about this stuff.... Perhaps would have thought it was cooler and see more practical applications in everyday life
Indian flag❤
Maine bhi notice Kiya ☺️☺️☺️
@@AVSTUDIO589not Indian flag...its Just a pipe used to demonstate the buoyancy..... Just happened to be the colour of Indian flag....
🤷🤦
what's with you guys
This is brilliant and breaks down physics to a level anyone can understand
The best types of scientists are these guys, who add in a show as they are teaching you about it
p1+12ρv21=p2+12ρv22. Situations in which fluid flows at a constant depth are so common that this equation is often also called Bernoulli's principle, which is simply Bernoulli's equation for fluids at constant depth.
This man has taught me more about physics than anyone else. Im glad his stuff is here for us to find.
Watching him with the wreaking ball caught my attention.
Man this has to be one of the best professors ive ever witnessed. Brilliant
I wish i had teachers like this back in the day makes learning alot more fun
Where were these kinds of teachers back in the 60s - 80s when I was young and in school!! You were lucky to get one teacher, in one class for one semester that was interesting while teaching, not just reading from a book they probably wrote and made you buy to take that class!!
Basically a sudden velocity drop = pressure increase & a sudden pressure drop = a velocity increase.
See this in action all the time on steam locomotives.
Good ol Bernoulli!
This is a great teaching cos it’s so simples!!
He didn't explain how though: at equilibrium, mass flow rate is constant. It's not like you can have more mass moving at one part of the stream - this is intuitive. Now if you constrict the volumn (or cross sectional area) fluid flows through, well since amount mass flowing can't change, then it has to move faster. If you have a thing straw and a garden hose pushing out the same amount of water per time, obviously the staw will be pushing out the water much more quickly than the hose. That why when you put your thumb over a garden hose you can make it spray: you're reducing the cross sectional area so the velocity must speed up to maintain constant mass flow rate.
I wish my prof was like him back in university!!!! You have so much ppl interested in STEM...
There is a very similar experiment that is easy to try at home. If two apples or spheres are suspended so there is a small gap between them, try to force them apart by blowing through the gap between them. The result is that the apples or spheres actually move closer together because the increase in speed through the gap lowers the air pressure.
An incredible gift to society to be in his classroom
Sir Walter Lewin is an absolute thrill to watch. ❤❤
I would have loved to have had him as a teacher!
Wish there was more teacher like this guy.
This was one of the best professors I had ever followed. He was always such a humble and down to earth person. May God bless his soul
Wait until you learn why he isn't a professor at MIT anymore...
@@not_even_me5035 Let me be your student and teach me
Wish I would have had teachers like that when I was in school I might have stuck around for class more often maybe graduated early.
There's a product before my retirement that I sold used for gripping materials in automated applications using this princible. The manufacturer is Piab. High velocity air through an orfice producing a strong vacuum on a suction cup attached to the frame. Works great for lifting sheets of non porous materials like steel or plywood without marring the surfaces.
i wish all teachers were like him
The one who was in his class❤❤..Memorable days
Why can't all lectures give practical examples like this. Amazing
This guy and the enthusiastic lady are awesome and all stem teachers should educate like this.
You are gonna scratch the surface and hopefully make you interested enough work on it yourself. But don't kid yourself, this is not enough to actually learn anything by itself.
Dr. Walter Lewin its nice his videos on MIT Opencourseware are being seen by the public.
There was a great nuclear physicist Feinman whose extraordinary lectures on gravity, Einstein, relativity h were recorded and drew thousands of curious students. The great ones who understand complex physics are sometimes able to explain things in a simple way. It's a wonderful gift. Feinman was a crazy drummer and also explained to Congress why the Challenger's o rings failed, causing a catastrophic explosion of the capsule on re-entry.
The laws of physics😮 are amazing! If you can learn all of the laws of physics, you can do amazing things and make amazing things
My 9th and 10th graders had a blast learning Bernoulli's Principle last year. We made different types of paper airplanes and flew them off our second floor breezeway. ✈️🛫🛩️❤
This doesn't help me understand Bernoulli's principal at all, just how it's demonstrated. What I want to know is WHY an increased velocity of gas translates to lower pressure. Because for the everyday person, who's understanding of "pressure" comes from pressurized water, so intuitively we think higher pressure equals higher velocity.
Can someone explain? Or conversely, why does a higher pressure result in a lower velocity? I've read about venturi's, I understand the equality principal behind Bernoulli's, I just don't understand the actual process.
It's true that this experiment alone is not explaining it clearly. High speed leads to higher pressure IN THE DIRECTION OF THE SPEEDVECTOR (or airflow direction), but leads to lower pressure IN THE PERPENDICULAR DIRECTION OF THE SPEEDVECTOR. So the ball gets sucked to the wall (perpendicular direction to the airflow). Hope this helps.
Pressure, gravity, and heat. Three things that are easy to understand at their concept, but become evermore complex the further you dig.
Teachers with passion will get through to all students. If you’re not passionate about teaching don’t waste time becoming a teacher!!
Physics teachers are the best cuz no one goes into physics if theyre not absolutely astonished and amazed by it.
I love teachers that get excited about their job.
Wish i got techers like this growing up. Mine seemed like they found their subjects boring and they never could explain things so i could make sense of it
This is why I love physics it's so fun to learn
I wish I had a teacher like this
This is why if you put the nozzle of a high pressure hose against the inside wall of a pool it will actually stick rather than repel
Bernoullie's theorem is part of what helps a ram pump for water work correctly.
Love the actual showing the work instead of just giving the kid a book and pretty much figuring it on their own time. Love it
High dynamic pressure means low static pressure to just pressure as is commonly stated. Thus less force in the low static pressure area against the surfaces and higher on the other surfaces so this will cause a change in motion of the ping pong ball. I love it
Wow... Extremely good illustration
I don't know why RUclips has put this man in my playlist but he's brilliant!
At university we had a psychology professor whose teaching style was exactly the same as that, everyone who took the class agreed that it made the lessons unnecessarily difficult to listen to and take notes, this was long before computers.
it is a shame not many teachers teach like this anymore
I love this kind of teachers
I would have loved his class.
Unless you’re female
This is the type of person that needs to teach. Gosh, class would have been so interesting with a teacher like this. All we did was get an explaination, copy text (which doesn't teach anything) and then write a small test before going to the next equally boring subject. :')
Principle of Flight (i.e.why an aircraft wing or a propeller works). Good demo.
Wish I had such a teacher in my days.
Nice! This is a nice and easy demo... Will keep this one. 🙏🏾
That’s how Carburetors work and move fuel. High pressure to low pressure makes the fuel move to the low pressure which is in the Venturi