Newton's third law - Best Demonstration EVER !! - by Prof. Walter Lewin
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- Опубликовано: 19 дек 2020
- This is an excerpt from Prof walter Lewin's fairwell lecture on the 16th may 2011. He beautifully demonstrated Newton's third law of motion as well as the conservation of momentum at the end of this lecture -- • For the Love of Physic...
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Credit:
1. Professor Walter Lewin : @lecturesbywalterlewin.they9259
2. MIT open Courseware : @mitocw
#ThePhysicsMathsWizard #WalterLewin
i have received alot of comments on this video saying that it does not demonstrate the third law but rather the second.
Actually, when it comes to rockets, all 3 newton's laws apply. in this video, i was only interested in talking about the third law.
Like all objects, rockets are governed by Newton's Laws of Motion. The First Law describes how an object acts when no force is acting upon it. So, rockets stay still until a force is applied to move them. Likewise, once they're in motion, they won't stop until a force is applied.
Newton's Second Law tells us that the more mass an object has, the more force is needed to move it. A larger rocket will need stronger forces (eg. more fuel) to make it accelerate. The space shuttles required seven pounds of fuel for every pound of payload they carry.
Newton's Third Law states that "every action has an equal and opposite reaction". In a rocket, burning fuel creates a push on the front of the rocket pushing it forward. This creates an equal and opposite push on the exhaust gas backwards.
I think the third law one is incorrect. The fuel do create an upthrust but the reaction force by the air also helps it move upward. As the mass keeps on decreasing with decreasng payload, the acceleration increases according to second law(a=F/m) due to which the escape velocity is much higher then the acceleration due to gravity. All this owing to the fact that the upthrust stays the same throughout for equal force output.
I didn't get this, but after reading your explanation I now understand,
Newtons laws dont work in a vacuum.
@@paulnotdownunder3172
I assume you are trolling but just in case you really think that.
1) Newtons Laws work perfectly well in a vacuum within their bounds of applicability
(e.g. relativistic factors becoming significant at very high speeds)
2) Rockets continue to work according to Newton III
3) Gravity also clearly operates just as well across the near vacuum of space as well as close to the ground
What you mean is,
4) jet engines don't work in a vacuum because they need incoming air to compress and to burn fuel in
(a jet that carries its own fuel and oxidiser and discards the inlet, is basically a rocket)
5) propellers don't work in a vacuum because while an engine could still rotate the prop (if say solar or batter) there would be no air for the blade to push against.
And,
6) no, rockets don't work by pushing against air (common misunderstanding though),
they work by throwing a mass of combustion production out of the back at immense speed and the the forward momentum added per second is equal to the momentum of the rocket exhaust per second.
The integration of this over the complete burn is literally called "the rocket equation" and you can calculate the final speed from initial conditions.
@@paulnotdownunder3172 Momentum
Indian teacher explanation:
If you slap ur friend, then ur friend will slap you too..
.°. Confirmed
Not if they are Christian, you turn the other cheek. 😜
@@johnevans6399 Lol
😂
🤣🤣👌👌🙏This comment made my day
Indian teacher: This is a very important 2 mark question.
You should by heart these three laws
:-( you're right
Haha😂😂😂😂😂😂😂😂😂😂😂😂😂😂
@@gauravgiridhar1711 bad for you if you did not make the best use of your teachers. I doubt a teacher would not explain a concept if asked. After all, that's their job.
@@randomrainbow8423 Every action has equal and opposite reaction was explained by giving example like "when you hit your friend he'll hit you back." I'm not generalising but this is how I was taught in my 9th when mechanics was introduced to us. Well, in my 11th I got really good teachers who explained everything really well.
I had a professor very much like him for chemistry at Texas Tech University. Dr. Russ Larsen, he made Chem come to life! I'll never forget him! God bless Professor's and teachers that have this gift!
That should the goal of every professor to bring their dead subject to life
Was his name Mr white?
Did your professor also sexually harass students like this guy did?
You can actually make life with chemistry
Professors. No apostrophe.
Walter Lewin is unique and THE best Physics Teacher I ever encountered. I had the pleasure of having Physics 801 and 802 with him. Watching his classes changed me completely in all subjects, making me sharper in understanding any problem I face, not just in Physics!!
Who wouldn't be interested in physics with a professor like him!
Nah he's just being a show off & not a professor. Practical examples are fundamental & should be interesting, but he's just trying to pose.
@@GokulOnFire Dude, he was a lecturer in MIT, don't u even know about mit?
@@lamunedonein2656 wow great reveal pal, despite the name of the channel that posted it, I never saw it coming. Smh... I know he's a professor but that's what I'm going for some professors act like celebs instead of being professors. The want students to admire them. Lecturing comes second. They're self serving.
@@GokulOnFire I read somewhere this class is open for public, u can see there were also many old people on the class too, that's why he is teaching basic stuff, he only wanted to share his perspective on how physics work in real life
Indian needs tonns of professors like him
And after this demonstration Sir Walter cried.. Bcz it was his final lecture in MIT
yes, it was really touching, he's a legend
Why???
@@Cosmic_Dancer He retired from MIT... It was his last lecture, so he departed the last class in a memorable physics style...
@@Cosmic_Dancer isn't it obvious?
🥺🥺🥺🥺🥺🥺🥺🥺🥺😕😕😕
We need more teachers like him, this teacher demonstrates two things that are key in education: he loves being a teacher and seeks ways for students to understand the subject matter without tedious explanations. A true teacher! 👍
Lectures are always better with visualization.
I remember when I studied chemistry there was always one time each year when I was sitting in my lecture and suddenly heard the sound of a big explosion somewhere else in the building and I knew "Ah, they're teaching the properties of hydrogen today."
And after this lecture Mr Walter lewin cried because it was his last lecture at MIT.
FOREVER A LEGEND🔥
Not any more, have a look at Wikipedia
@@dwalther4856 what do you mean
@@anishbhat4506 In December 2014, MIT revoked Lewin's Professor Emeritus title after an MIT investigation determined that Lewin had violated university policy by sexually harassing an online student in an online MITx course he taught in fall 2013.
@@anishbhat4506 Sexual harassment..
@@J1I9M7M4Y
That's false news.
I know actual story why he was removed from MIT but according of terms can't tell the reality.
I know via someone who has high reach in MIT.
Newton's First Law:
A body at rest wants to stay at rest.
(Every day morning wake up)
🤣
Unless acted by an external force(mummy with chappal)
@@shubhadeepkar2190 sometime Broom stick too
And switching off the fan. Or the grinder (mixer) grrrrrrr
😂😂😂😂
This is called teaching. Not who force children to crame.
Great work by professor sir.
Love this ❤️❤️❤️
World needs more teachers like him ❤️
Yes, more old guys who sexually harass women. We need many more!
@@DegenerecyI read all the articles I could find on the subject. What did he actually say?
Me goes to school everyday, attend boring classes , etc.
The day I'm absent: ...
That one got me!
"hey bro We did a fun activity yesterday, too bad you're absent lol the teacher was doing bla bla bla and john was bla bla bla that was awesome bro"
"okay"
@@arandomguyontheinternet9057 lmao 🤣🤣🤣🤣🤣
Copy paste
The day day you were absent your English teacher taught your mates about the difference between "me" and "I" :) :) :)
What I've learned with this video: There is an "Indian teacher community" on the internet
Lol🤭😅
Yeah..every comments about Indian teachers
Theres always an Indian better than you 😂😂
India is producing highest number of graduates and professionals In the whole world. Let that sync in.
Lol, max are fake though, they do this just because of no. of likes..there are a lot of cool teachers/professors as well
These kind of teachers makes the most difficult thing easier and fun i rlly love him ❤️❤️❤️❤️
I can see why his classroom is jam packed! His lectures must be really interesting!
If physics in India was taught like this. Students would have fallen in love with Physics. But unfortunately teachers just cares about the numericals and all.
Edit:- Those who are saying that I have commented just for likes and all. Let me make one thing clear that quality education is very rare to find in India. I know there are some good teachers too but there are just few in numbers. And getting education from them is not possible for many students. Thanks to Internet, I came to know about some amazing teachers who teaches very well. I am getting a quality education on free of cost. But if I didn't have internet I don't know what would have happened. As in many parts of India specially in the regions of U.P. and Bihar it's just so difficult to get a good teacher. And if you are having financial issues. It just impossible to get the quality education. People are saying that I am random person who is just spreading hate. So I just wanna say that if you guys didn't struggle to get a good school, teacher and education that doesn't mean the whole scenario is that good. Just because you are living in a developed part of the country you guys are saying that. If you guys have time just visit the backward or less developed part of the country. And then see the quality of education and availability of good teachers. And then comment. I am not here playing the victim card but ya it's the harsh reality. Just forget about the quality of education the place where I am living it's very difficult to find a teacher. I have access to internet and other resources so I am going good. But that's not the reality of the whole country. Many people still don't have access to internet or other resources to get a proper education. In my area many students just don't take Science after 10th because they have not that much money to afford Coaching. Just wanna say that if you are not going through something doesn't mean that it don't exists. Thank you🙏
Yeah our institution focus only on syllabus how to complete the syllabus in hurry that's our teachers only aim....and this happens in every institution....
Yeah. In the past I was a teacher for 3 years. The thing is the institutions in which you enroll don't care about taking care of teachers. Teaching is among the most underpaid and unstable job in India.
There is no rewarding mechanism in institutions that will inspire teachers to excel even more, infact they are demotivated by the very same institution. If any entitled spoilt child complains against the teacher, the institution will warn/take action against them.
So yes, there was a time when teacher held a position greater than the parents but now they are the disposable one. Not everyone wants to excel in a thankless job. So next time before blaming any teacher please think about what might be the reason behind their actions.
@@SoumendraBagh Sir, I am not blaming teachers and the fact is that many teachers just focus on completing the syllabus. And if you ask any doubt, they will yell like that you have committed a crime by asking questions. Undoubtedly, there are teachers who are excellent in their work. But unfortunately there are many ones who just seems to not care about anything.
True.... Practical demonstrations are rare in our institutions🙁
@@bisma9707 May Be in Future They Will Also Extinct
Teachers will Show Digitally Which was Done by Others
And Simply They Show These Type of Videos
In India, Teacher will put Pen between Students fingures and then will press it and then we React.
😃🤣 Sadist teachers.
😁
Correct . Ideot lecturers are like that only.
😂😂
🤣🤣
Prof Walter Lewin teaching with grace!!
Physics is the best subject. I'm very much interested in Physics 💫
And he is an amazing professor 😄
"Teachers who make Physics boring are criminals."
"If you find learning Physics boring, then you are learning it from the wrong teacher."
@Aditya gupta yeah but he's is boring and overacting
exactly... i agree..... but i love physics cuz my teachers are great!
we should learn to respect our teachers rather than taking rubbish about them....
if they were not there you wouldn't have even typed this comment
@Aditya gupta these lines are famous quotes..not my words
@@BeastGamerZ007 first line was said by the great Physics professor Sir Walter Lewin himself
@@BeastGamerZ007 and second one by Richard Feynman
The comments:
99%: Indian teachers
1%: About the teacher
It should be india Pakistan techers or central Asian teachers
Who paying fees for this type of study?
Nobody, it's very costly for Indian students.
Only few peoples know fees structure of MIT or elsewhere.
ruclips.net/video/_sBEySuzjqo/видео.html
They really dont know to shut up do they
@@KhaiGK wbu?
Reminds me of my old Physics classes at the University of Colorado, Boulder. They had the best classrooms and demonstrations.
Any teacher who brings learning to life is super. Thanks.
The professor and a three wheeled unicycle that was great.
That’s called a trike
You don't miss a thing do you?
Three wheeler unicycle🤔🤔🤔🤔
I have a doubt what is the opposite reaction of throwing a stone?
@@NidhuJJohn-th5yg the stone flies
Ask a difficult question to teacher in India he said this is not in your syllabus. You will study in higher classes
And in higher studies the will tell the had teach u that in previous year
@@surajchoudhary8814 * they (CMIIW)
And my teacher say it is exception
Now I don't know whether to stay serious and thoughtful trying not to laugh or to burst out into a huge laughing
@@surajchoudhary8814 When does that happen?
Fantastic demo!
ABSOLUTELY THE GREATEST PHYSICS TEACHER FOR ETERNALLY ALL TIME!
JUST WONDER CLASS. SIR WALTER, HOPE YOU WILL GET YOUR ENERGIES HIGH AS MUCH AS YOU CAN. BRILLIANT!
He sexually harassed his female students.
India: teachers throw duster as an action to see the students opposite reaction..
@JOBIN TOMY 🤣🤣🤣
😂😂👍Are bhai
"Newtons third law. You gotta leave something behind." - Cooper
We need such teachers in Indian primary schools. Amazing 👏 👌
I really like instructors like him. Great example
A diet of beans and legume generally have the same effect...
😆😆😆😆😆😆😆🤣😂😂😂
@@mch4735 stfu
Beans ARE legumes
@@Philrc All beans are legumes but not all legumes are beans.
@@BourneAccident I Never claimed they were, did I?
Indian teachers will just dictate the statement of Newton's 3rd Law and say that topic is over.... That's why maximum students in India are dependent on Private Tuitions...........
Physics wallah
SedTruth...
@@01angadsingh me too pw is love
@@LMrazestar10 hey
Youre a jee / neet aspirant or in class 9 10
@@01angadsingh jee
It's literally great teaching sir people want this type of teachers each and every colleges .... Crystal clear Newtown third law #physics #Teacher
These type of video have 0% of thumbnail
And 100% of quality 💚
Indian teacher would throw chalks at sleeping students to see how they react
Indian teacher: "if I take a stick , your heart will beat "
that also reaction 😂
Yeahhh😂😂
Wha 😂
Potential energy
Lol😂
😂😂😂
You know, this morning I also just learned about Newton's third law material from my teacher. He also gave Demonstration of this material
Thx for sharing brother
Imagine this being the his way of leaving the class after his last lectute
the immense amount of respect I got for this 85 yr old dude is immeasurable he's so good with what he's teaching he defines the true meaning of a great TEACHER and so for his subject
Then he or.like money or did somthing wrong and has not plenty to retire.
@@boelensds are you having a stroke??
He sexually harassed his students.
@@Fogmeister were u one of em to know so 💀
@@hunkaitrash3271 no, it's reported in multiple places.
en.wikipedia.org/wiki/Walter_Lewin#Sexual_harassment
I found out originally from a RUclipsr physicist.
Simple… but effective! Good demonstration.
The most impressive way to explain the Newton' laws 👍👍 ❤️
I'm my school, there was a teacher who said “only legends understand it."
Indian teachers: no, we don't do that here.
Especially our andhra pradesh teachers
@@NatureClicks011 no bro, teachers almost all around India, they dont give a fuck about actually teaching the subject
That's why you're here watching random videoes and killing your time ⌚
@@Gouravthappa yes
hahaha corrrect
A masterpiece! Bravo 👏
I will love to attend this prof class
If every prof teaches every subject like this I think no one will fail
*taught *would fail
We learnt like a parrot in the school days
But u probably won't finished all the chapter that the school scheduled
And that's a lie majority of people have very low learning skills and nowadays some of them lost them completely believing everything internet says
Ya so in English when we are learning about Shakespeare the teacher has to do something like this to demonstrate I don’t think that would work buddy
Newton's Third law is easy
When you slap Someone (action)
That someone slaps you back (reaction)
😂😂
that's true, :)
Nics copied comment
Nope you're wrong
They bring their friends
😀😀
But according to Gandhi ji if one slap given the put forward your another chik for slap.
But if im teacher nd he is student then Newton's 3rd law isn't valid😁😀😀🤣
That was amazing.
You know the state of college education when this actually needs a demonstration.
When you wear the same shirt in an interview with physics waalah on 13 march 2021 , 20 years later!
Simplicity level= walter levin sir🙏🏻
I like the way how he teach to his students by giving practical examples. I want him to be my professor. Hats off👍👍
But this is not what comes out in exams. It's always some calculations and formulas. Explaining this only gets 1 mark.
@@JK-qr9rt IKR today's academic success only depends on your marks no one cares if you have creative knowledge or some shit. Only thing needed is marks
He actually can, whatch his lectures on his channel, but his videos only help you to understand theorical concepts, he doesn't work su much with number and formulas
This guy sexually harassed his female students.
@@JK-qr9rt You expected something else??? You're there to learn, not to be entertained.
Great demonstration...👏👏
Such a tremendous application of newton's third law.
Japan teacher: Use a jetpack and fly across lecture hall
Me who had to write this 100 times but still didn't get it while in school :get this man an award
Yeah- Random chemicals inhaled into lungs at close range... clap clap clap. Pure intelligence.
Love this video
Sir you did at amazing to that activity which be seen in this video
If this was the way they explained in college i would not take a holiday.
If you taught yourself this way, you would not be sitting on RUclips complaining. Nobody owes you anything.
@@baxakk7374 I am talking about the teacher taking his or her time and liberal explaining concepts to the students not so just to finish portion.
And by the way I am not complaining about anything i just made it a sense of humor joke.
I didn't ask you to owe me your rubbish comment.thank you
If he set the Extinguisher pressure as lowly by bar/kpa/kpacl
What he gets result? While travelling cycle/Backward walking
IN MY VIEW
This professor is nothing short of BRILLIANT!
now people will start saying, if my school had taught me physics like this, i would have become a genius 😎
indeed
not really necessarily a genius, but having a genuine understanding
I wish
A genius can be self taught
That's true
Yes this teacher is legend and the world should give him best teacher award
Sorry for my english
ruclips.net/video/9cwktHGpMQo/видео.html
Your English is fine; your thoughts Noble.
Hello!
Sorry for my English.
@@ThisHandleFeatureIsStupid Hi Kasper!
Sorry for my bad English.
I done this on a scakebord, with Estes modle engines, back in the 70s. Young and Love science. I went a few feet too. Kudos.
This Professor know the way to entertain the student yet educate them at the same time,
Teaching is a passion & art, Prof Walter lewin, clearly testifies that. I hope I was fortunate to have teachers like him.
This 52sec was enough for it👍great
ruclips.net/video/_sBEySuzjqo/видео.html
Literally deserves the cheers
Wow... live example.. great presentation
That shows how a straight face can also bring smile to many faces without utter a word 😄☺🙏
I have never been bored by any of this mans videos. I retired 10 years ago at the age of 40 and I still enjoy watching his videos and learning even more today than when I first started watching! You sir are one heck of a good teacher! THANK YOU for all that you have done for us watching here at home! I do hope those in your classroom realize how much they have been blessed by watching and talking with you firsthand.
At the age of 40, retired or get fired?
@@sitkasate I sold my business and retired.
You retired at 40. You are either a lazy git or greedy capitalist!!!
What is wrong in retiring @40?
I like your style man. And I like your shirt too !!! 💯
this moves me so much, he is so inspiring
While I appreciate effort, I found most professors only demonstrating simple concepts. As complexity increases they are completely defensive.
True
Can we also appreciate this guy giving hearts to every comment after 2 months👍
Thanks so much, i appreciate it
@@ThePhysicsMathsWizard lol I got one too. Btw thanks for sharing this, I didn't know about him, found out he also has a u tube channel. Now I can also interact with one of the greatest physics minds in the world.
@@abcd1234___ Thanks, i Appreciate it
He is bored after that class.. So keep clicking to react
This is what passes for great teaching at MIT.
The parts of the lecture where he's doing math for 20 minutes don't get millions of youtube views.
I want like this lecturer's in my college,and miss you sir 😄👍
Indian tecahers
8th grade: You will learn about this in your next grade, so we can skip it.
9th grade: You must have learned about this in ur previous grade so we will skip it. 😂
😂
In Bangladesh too✌️😁
In Pakistan too
So truee
In Zambia too😂😂😂
The video is in everyone's recommendations and I am not complaining
ruclips.net/video/DZOd1GylG-I/видео.html
That is how you teach so students remember the topics. How many other proffesors get an ovation when they come in?
Are there components needs for an action to occur?
If there was no atmosphere to thrust off of is there an action occuring?? And so would there still be a reaction???
the best teacher in the world is one who gives heart to every single student...
Okay thaks
One of the best teacher on physics. Love and respect ❤️
Great example for a professional to set examples.
Lovely & lively aswell!
Plot twist:- This Teacher Is Himself The Newton
Reincarnated.
Like indra and Ashura
Madara and hashirama
Sasuke and naruto
Lesson aftermath: Everyone in the class died from carbon dioxide asphyxiation following the complete discharge of the fire extinguisher.
Even who wouldn't have proper theoritical explanation.. But he is legend.
Amazing professor
I have a question, suppose a hot air ballon is flying in the sky.Fb>W but can I assume the Fb as action force and W as reaction force?
FB is due to air so it's reaction goes to the same source I mean air
W is due to gravity, the body and the earth pull each other
Hope I answered the question thank you
In my school, teachers used to focus on how to finish syllabus before board exams 😂😂😂😂
physics in my school: so open the book at 213 page..
physics with Walter Lewin:
For a complete explanation of of Newton's action-reaction principle you need to incorporate all three of Newton's laws of motion. According to Newton's 1st law both the gas being expelled and the bicycle have inertia, which causes them to resist a change to their states of motion. Then according to the 3rd law both the gas and the bicycle are pushing each other in opposite directions against their relative inertial masses. Then according to the 2nd law the amount of force being produced is equal to the mass of the gas times the rate its being accelerated.
very good Teacher I really love him so much. He Explant on his lesson. all the student will be understand from him. but now he become to the teacher old man and retire . I miss and love him so much.
Indian teachers - " it may be defined as........."
"Didn't see that coming"
_Sir Isaac Newton_
In the vacuum of the empty space, is it the same reaction? or it would stay with same orbiting path?
This guy put a fire extinguisher on a bike and won a round of applause 👏