Newton's third law - Best Demonstration EVER !! - by Prof. Walter Lewin 

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.

Who wouldn't be interested in physics with a professor like him!

And after this demonstration Sir Walter cried.. Bcz it was his final lecture in MIT

And after this lecture Mr Walter lewin cried because it was his last lecture at MIT. FOREVER A LEGEND🔥

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!

Indian teacher explanation: If you slap ur friend, then ur friend will slap you too..

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!!

Newton's First Law: A body at rest wants to stay at rest. (Every day morning wake up)

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! 👍

Indian teacher: This is a very important 2 mark question.

Me goes to school everyday, attend boring classes , etc. The day I'm absent: ...

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🙏

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."

A diet of beans and legume generally have the same effect...

Ask a difficult question to teacher in India he said this is not in your syllabus. You will study in higher classes

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...........

This is called teaching. Not who force children to crame. Great work by professor sir.

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

In India, Teacher will put Pen between Students fingures and then will press it and then we React.

These kind of teachers makes the most difficult thing easier and fun i rlly love him ❤️❤️❤️❤️

The professor and a three wheeled unicycle that was great.

What I've learned with this video: There is an "Indian teacher community" on the internet

I like the way how he teach to his students by giving practical examples. I want him to be my professor. Hats off👍👍

A good teacher is always exceptional 🙏🙏🙏

"Teachers who make Physics boring are criminals." "If you find learning Physics boring, then you are learning it from the wrong teacher."

The comments: 99%: Indian teachers 1%: About the teacher

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.

We need such teachers in Indian primary schools. Amazing 👏 👌

Newton's Third law is easy When you slap Someone (action) That someone slaps you back (reaction) 😂😂

India: teachers throw duster as an action to see the students opposite reaction..

"Newtons third law. You gotta leave something behind." - Cooper

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.

Indian teacher: "if I take a stick , your heart will beat " that also reaction 😂

If every prof teaches every subject like this I think no one will fail

Yes this teacher is legend and the world should give him best teacher award Sorry for my english

Reminds me of my old Physics classes at the University of Colorado, Boulder. They had the best classrooms and demonstrations.

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. 😂

That shows how a straight face can also bring smile to many faces without utter a word 😄☺🙏

Teaching is a passion & art, Prof Walter lewin, clearly testifies that. I hope I was fortunate to have teachers like him.

I can see why his classroom is jam packed! His lectures must be really interesting!

the best teacher in the world is one who gives heart to every single student...

Love this ❤️❤️❤️ World needs more teachers like him ❤️

now people will start saying, if my school had taught me physics like this, i would have become a genius 😎

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.

Can we also appreciate this guy giving hearts to every comment after 2 months👍

When you wear the same shirt in an interview with physics waalah on 13 march 2021 , 20 years later! Simplicity level= walter levin sir🙏🏻

While I appreciate effort, I found most professors only demonstrating simple concepts. As complexity increases they are completely defensive.

You know, this morning I also just learned about Newton's third law material from my teacher. He also gave Demonstration of this material

We need professors like this..hats off to you sir Krishna Kishore India

Even who wouldn't have proper theoritical explanation.. But he is legend.

Me who had to write this 100 times but still didn't get it while in school :get this man an award

This Professor know the way to entertain the student yet educate them at the same time,

One of the best teacher on physics. Love and respect ❤️

Indian teachers: no, we don't do that here.

This 52sec was enough for it👍great

Any teacher who brings learning to life is super. Thanks.

When ever i see PHYSICS i thought next word will be WALLAH 😄

Imagine this being the his way of leaving the class after his last lectute

Everyone wants best teacher, best college. But no one wants to do anything him or herself. Believe it or not, such teachers become this genius on their own, not by studying in any school. So help yourself. Take help but do self study also.

I was taught by very good teachers. One physics model was, two wood cylinders perpendicular to each other. The cylinders could rotate independently. Top one had a handle. The two were connected by a O ring of cotton thread. When the handle turned, lower one would rotate. If handle was stopped and handle turned in opposit direction. What is the name of the principle/ inventor.

Him:🚴‍♂️💨 Everyone:👏👏👏👏👏👏👏👏👏👏👏👏👏👏 This teacher must be a legend

Indian teacher would throw chalks at sleeping students to see how they react

Newton's 3rd law demonstrates that a solid brick wall has quicker reactions than a human. Get 2 people to press hands with each other and push hard equally, nothing happens right. Then 1 person stops pushing and the other lurches forward as they cannot stop pushing quickly enough. Now get 1 person to push a brick wall hard then suddenly stop. The wall which is pushing equally as hard (Newton's 3rd law) doesn't lurch forward so it must have stopped pushing at the exact same time as the person. Amazingly quick reactions.

Prof Walter Lewin teaching with grace!!

physics in my school: so open the book at 213 page.. physics with Walter Lewin:

Japan teacher: Use a jetpack and fly across lecture hall

He will die for you and make you clear every concept a real teacher love u sir from bottom of my heart

IN MY VIEW This professor is nothing short of BRILLIANT!

By this demonstration we just understand rocket science 🚀🚀🚀 "That it is small step of human but giant leap for human kind"🙏🙏

I'm my school, there was a teacher who said “only legends understand it."

Plot twist:- This Teacher Is Himself The Newton

The same effect can be observed on a skateboard after consuming a hot curry the evening before. Fire extinguisher not required, unless an ignition source is close by.

The video is in everyone's recommendations and I am not complaining

Just Love him. He has an infinite love for Physics man!!❤️

Physics is the best subject. I'm very much interested in Physics 💫 And he is an 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?

If this was the way they explained in college i would not take a holiday.

Those are very lucky who gets the teacher like him.. Respect..👍👍

Everyone's clapping like this is the coolest thing they've ever seen

Such a tremendous application of newton's third law.

Hi friends, i found this amazing demonstration of Newton's third law that i thought would be nice to share with you. Please subscribe to the channel, i produce timely content on physics and maths topics, check it out to see whats in stock for you.

He taught without saying a single word!!! Guru!!

Actually it was a mathematic class, but teacher did'nt felt like teaching.

0:31 And here we have Newton's first law

We used to clap the same way when Teacher lit up the burner in Science Lab 😄

Good examples are : a swimmer pushing the water back wards getting the same magnitude force Rocket launch A person kicking a wall with bare feet Gun recoil

Today was my science exam and I got this in recommendation!😂😂 And this topic was also included🤣 Good job RU-vid🤣

That is how you teach so students remember the topics. How many other proffesors get an ovation when they come in?

If physics are taught like this in all countries. Then we would get at least one Newton from each country

This is best example of Newton third law💯👍👍👍

In my school, teachers used to focus on how to finish syllabus before board exams 😂😂😂😂

These type of video have 0% of thumbnail And 100% of quality 💚

This guy should get the best teacher award. If all teachers were like him more people would pay attention.

All dislikes are from Indian teachers !! Lol.

Plot twist: thats actually an outsider that got lost inside the campus and just passing by.

My physics teacher use to say that 'Its always a fault of a teacher who don't know how to grow interest in his subject' Once a student gets interest in a subject, than He/She will automatically work hard in that subject and marks will be the by product.

I love how they started music while the cycle was about to move

Indian teachers - " it may be defined as........."

I started clapping too

After reading the comments, I now understand why such a simple act got such applause. I was wondering just how simple those people would have to be to be THAT enthused over a fire extinguisher strapped to a bike.