Also it would probably make some students and visitors feel awkward (like when people clap after pilot's graceful landing), and other teachers jealous enough to, I don't know, steal one of professor Lewis's fabulous pins?😅 I bet he feels rewarded far more seeing excellence in his students and their enthusiasm,or how the hall is always packed. And I hope his students will never cease to make him feel appreciated for cultivating love of learning and his unique teaching method.
@@margodphd It would? In my university it is normal / customary to applaud the professor (just not with clapping your hands but knocking on the table). Is that not just a sign of respect? But the pilot thing 100%, boomers are weird
I don't know what I'd have done without these lectures! They re-instill my passion in physics. You're a great man! Thank you for impacting the lives of many :)
A great series of lectures. I went through graduate school in molecular biology and somehow came out the other end with very little knowledge of physics - it was mostly irrelevant to what I was doing at the time. So I am age 63 now and have decided to fill out my education, mostly because I wanted to understand the two Theories of Relativity, which are hard to appreciate if you do not know what led up to them. So I started studying more classical physics and now I am hooked. Among the sciences, physics has certainly achieved the most; asking questions about the age of the universe the underlying nature of the world, and showing us that it is stranger than anything we could imagine. I started out with the Caltech course “The Mechanical Universe” by David Goodstein filmed sometimes around the late 1970s (which for me makes it easy to imagine I am back in college). It is more than just a physics course, it is almost a course in the history of Western civilization, showing how the various ideas in physics evolved. Some of this is quite weird. Kepler, who was the first person to accurately describe the orbit of planets mathematically, was a kind of mathematical mystic, who believed that orbits of the planets should match Plato’s six ideal forms. Although this particular idea was wrong, the orbits turned out to follow perfect ellipses, so in a way he was on the right track. Of course we now take it for granted that we can describe all sorts of phenomena in the universe mathematically, but to step back to Kepler’s time - it is a bit odd that this should actually be true. I came to Dr. Lewin’s course because I found that the explanation of the mathematics was more complete, although as Dr. Lewin says, it is the concepts not the math per se that is important. “The Mechanical Universe” is also on UA-cam as are many of Richard Feymann’s lectures from an even earlier period. One thing that is interesting about watching these older physics courses is they mention ideas that are works in progress, and you have the great advantage of being able to zip forward to 2018 and find out what happened.
Whenever I do not understand a topic of what my physics teacher teaches, I come around and watch it from the professor and the topic becomes as clear as water. I would be delighted if you were my school physics teacher. Lots of respect for you from my side, professor :)
Must say sir, best online physics lectures I have ever seen. Straightforward, simple explanations, amazing demonstrations, and a legend of a teacher. I wish you well!
Indeed, nowadays this convertion of at least some of the "brake energy" is very common in almost all new cars, fossile fueled or electric/hybrids. I believe perhaps BMW was the first manufacturer to use it, in gasoline/diesel cars, maybe around 2006 or something? Many thanks for putting out these fantastic series for the benefit of students all over the globe! It is amazing! Greetings from Trondheim, Norway!
Dear sir , I have always been a lover of physics and now since I am in higher classes I am really feeling the way world works and your lecture gives me a way to connect my concepts in real world ,, the way you teach is really appreciable... Thanks for providing such gems free of cost!
I am in 11th right now and i read somewhere that watching Prof lewin's lectures would help me a lot for jee prep n they're amazing indeed 🙃 it's true you are father of physics legendary teacher
It boggles my mind why he doesn't get a round of applause at the end, very few people have that ability to possess the power to understand, convey and keep up the thrill of the subject at the same time, salute to you
Rotating rigid bodies - my favorite topic! A big thank you to professor Walter Lewin for getting the concept of rotational motion not in by head, but in my blood. I can feel the beauty of it all around! Here is a very cool demonstration that everyone can perform on their own. I was personally baffled when I first tried it. Take a book and shut it down with a tape or a rubber band. (Thin hard cover book preferred) Don't take a square book, by the way. What I want you to do now is throw it up in the air while giving it a spin. You have three ways to spin it. Let me tell you the axis' of rotations. Hold the book in both hand and take it in front of your eyes. All the axis of rotation goes through the center of mass. 1. Along an axis that goes from down to up. 2. Along an axis that goes from left to right. 3. Along an axis that goes straight through the book. Now that you know how to spin the book, give throw it up in the air while giving it a spin. NOTICE that there is one axis about which, if you spin it, it starts wobbling quite abruptly. It will be harder to catch the book when you spin along that axis. Try this demonstration and try to understand why it is happening. Hint: The axis that gives you unstable wobble is the axis through which the magnitude of moment of inertia in between the other two. Hope you like it!
~18:00 Lol to be a physicist. None of those pesky engineering restraints. The flywheel is silly in a practical sense because of angular momentum and torque. Lewin will do an excellent demonstration on this phenomena in the next few lectures. I've no idea how a car will actually react to this flywheel but the physics is probably quite interesting. It's 2016 and this lecture was ~2002 I believe. He was right. People have been taking it seriously! In Formula 1 it's known as KERS - Kinetic Energy Recovery System. This is possible because of very powerful batteries that have been developed since the time of this lecture. PHYSICS PREDICTS THE FUTURE!!! (APPROXIMATELY)
The flywheel would need a universal mounting and enough space to move around, otherwise taking corners could get interesting. Of course, with more recent electric cars braking sends current back into the battery, so accomplishes the same thing.
@@marcinna8553 One could also use contra-rotational flywheels, so that the angular momentum of the two flywheels adds up to zero. This would eliminate the nuisance of gyroscopic effects getting in the way of steering.
Yes Its true that this channel makes you love with physics ❤. Really your video helps lakhs of students to understand concepts easily. A HUGE THANKS FROM ALL OF US .
Formula 1 cars actually use heat from the brakes to restore some electrical energy for their hybrid system. A modern perc predicted by dear Sir . Very cool
in all of this lesson there's only one thing blowing my mind...how the hell he does that trick with the chalk to make the point lines? all the rest is just trivial
put your finger in the middle and use the chuck from his head, it would "jump back" (beacuse of the 3th law, you use force so the board will give the chuck the same force back) when you'll slide it across a board
Sir your lectures helped me alot to grab concepts of any problem in physics . I'm a lover of physics like you but because of the education system of India , I'm not able to focus further .. Literally here everyone is in race to acquire marks ,no one is in the track of understanding the concepts,my classmates also just memorize every term in our textbook ,it makes me annoying sometimes...BUT THE BEST PART WHEN I see your lectures is it helped to focus on that particular topic... Sir salute to you. If got a chance I want to be a student of yours... THANKS SIR
Don't forget: knowledge acquired memorizing disappears in few months, knowledge acquired understanding concepts lasts for the rest of your life. Then, if you're gonna attend Physics or Engeneering the notions you understood will help you in advanced classes whereas your classmates will have to start over learning/memorizing:)
I totally agree! It is highly painful sometimes when I want to think, imagine and enjoy some of the beatiful concepts of physics, and then I come to realise, as everyone here says, that I must solve these 40 problems a day, memorize theses whole lot of equations, and shut myself up for the sake of syllabus and these exams. It really feels awful.
21:10 With one flywheel the angular momentum would point perpendicular to or away from the road (depending on its rotational direction). When driving up a hill there will be a torque applied to the flywheel causing the net-momentum to flip the car over on either the left front and rear wheel or right front and rear wheel. I think in order to make the concept work, there have to be two counter-rotating flywheels to prevent the car from tipping over sideways when riding up or down a hill.
I never studied, did not show up to one lecture and avoided tutorials is physics, I just watch this man's videos before tests and get a 95% in the class
Considering the (i think previous) idea that decreasing moment of inertia has influenced the tectonic evolution of earth. Thanks for great lecture(s). peace and love
hello sir i really loves your lecture. I can remember the day when our physics teacher gives us lecture on damped harmonic motion in just 5 minute, i want to study that topic in more details and luckily i find your lecture on damped harmonic motion "vibration and waves" and from that time, and upto...... today i watch all of your lecture. I also got your book "for the love of physics" . I can't meet such a great conceptual teacher like you in my life. I really thankful to you. please accept my LOVE.
This is one fabulous vest, Professor. I always wondered what is the source of the quirky, large pins (like the strawberry one) is that I've seen You wear during previous lectures in this series, they are quite unique.
Hello Professor, I'm Himanshu from India , I'll be taking my JEE Advance examination next year and rotational mechanics is considered a very difficult topic, can you give some advice on how to feel the problems based on rotational mechanics and any material I should prefer. Is it possible to contact you through any media if possible. Thank you!
Always curious to know what next you will tell in ur lecture . U are just incomprehensible. The best Prof of this decade. Made me love❤️ physics. Sir I have been watching ur lecture since my 9th grade. Thanks for all the things I got because of you. :-)
Literally two seconds in and this stuff starts making sense... I know my physics professor is trying his best but I wish he would take this approach more and leave the "turbo encabulator" stuff out when teaching fundamental concepts.
professor how do they convert mechanical energy to magnetic energy ? I just wanna know the name of the phenomenon or just something relevant ,I searched for it on the internet but didn't find anything,can you give me any search terms or something please :? thank you ps: ive watched all you 8.02x videos
+InventTwig You first convert mechanical energy to electrical energy. Then you use the electric energy to create magnetic fields in a solenoid. henrykolm.weebly.com/mit-magnetic-lab-1961-82.html
Keep in mind that MIT is only a very mediocre University. That's why only 101 people who studied at MIT or who lectured there received a Nobel Prize. *That's very embarrassing.* Luckily you got a much better education.
Do you still remember the name of the textbook you mentioned in your lecture? I am reading University Physics by Young and Freedman, Physics for Scientists and Engineers by Knight, and Physics for Scientist and Engineers by Serway. I want to get the book associated to your lectures so that I am not confused by different notations used in different textbooks.
8.01 Physics Hans C. Ohanian 2nd edition W.W. Norton & Company ISBN 0-393-95748-9 8.02 Physics for Scientists & Engineers by Douglas C. Giancoli. Prentice Hall Third Edition ISBN 0-13-021517-18 8.03 Vibrations and Waves by Anthony French CRC Press ISBN 9780748744473 8.03 Electromagnetic Vibrations, Waves and Radiation by Bekefi and Barrett. The MIT Press ISBN 0-262-52047-8
Sir I have a question I also love physics about the theories and concepts and but when it's time for numericals I stucked don't know why my mathematics is notvery nice but I have a curiosity to study space and astronomy so what can I do ?
Start with arithmetic, most of math involves concepts to derive an expression but when working the actual problem having a good foundation of arithmetics will make it easier. Studying number theory really helped me with the understanding what to expect out of the behavior of any given number. I might just be dumb though.
these are great lectures. i am using them to study for my upcoming physics 101 test, but i cant seem to find anything regarding the theory of relativity. did i just miss it or is it not available?
Yes we find moment of inertia about any line then we can find across any other line by moment of inertia + md^2 where d is the distance between the given line respect to which moment of inertia has been found and we have found moment of inertia about ring and disc 1/2 mi^2..
Thank you sir , for this great explanation, i am a jee aspirant and i was unable to understand rotational motion from my teacher. You make it easy for me . before this lecture rotation motion is a impossible task for me. Once again thank you sir , you are the best teacher.. Love you from India
Wonderful lecture as always! I've got a question, during the talk about pulsars you said it wasn't well understood why, but the pulsar on the Crab Nebula was "blinking" at us, by that I inferred that it wasn't something predicted in the equations, so how did they know that it was the pulsar that was blinking when they adjusted the frequency to obtain the pictures? Since they didn't know wich one was the pulsar and they didn't know the pulsar would blink, how did they know that the pulsar was the blinking one and found the frequency? Thanks for your amazing work!
Finally I got your book ‘for the 💗 of physics’....it’s amazing to explore new and new stuff as each page passes💜🙏🏻👼😁😃😄...Your jacket is kinda a bit too different but much more amazing...I have got a doubt 🧐! You said at around 28:33 that rotational K.E of sun ☀️ might be converting into the heat and light and accordingly you predicted the time but what about the reactions of hydrogen and helium..those nuclear reactions must be releasing enormous amount of energy...isn’t it?
Reason 1: because the linear speed associated with rotational motion of a rigid body, is proportional to the radial distance from the axis of rotation. Reason 2: because angular momentum of each constituent particle is proportional to the distance from the axis of rotation. Both reasons together become why moment of inertia is proportional to r^2. The calculus that determines moment of inertia integrates r^2 for every infinitesimal mass element dm.
Ultimate Pirate he actually has a video explaining how he does it. Basically He doesnt draw the lines with his hand completely perpendicular to the board but instead tilts it in the opposite way of motion, so when he goes for the line, his hand bounces a little off the blackboard creating the dotted line.
Sir, a question: I just want to know what was your daily routine during 1)Your school days 2)Research 3)Teaching 4)Now We also want to know how hard you worked to become so successful in your life. We would be so happy if you make a video on this. Thank you so much once again sir. We love you a lot. May god (In your view, if exist) give you lots of health and hapiness. Please reply.
The lecture is from 2001 and Hubble was already in orbit by then, still you guys didn't have the a Visible Spectrum of the Crab Nebula, i guess it hadn't been assigned the observation yet.
I am befuzzled at why you don't get a huge round or applause at the end of every lecture. You convey information in a most inspiring manner!
I received many applauses, but since my lectures were so famous, the students had raised their applause bar for me.
It's because the class is a bit befuddled each day, dreading the test, sweating the possibilities of failing the class...(again)...
Also it would probably make some students and visitors feel awkward (like when people clap after pilot's graceful landing), and other teachers jealous enough to, I don't know, steal one of professor Lewis's fabulous pins?😅 I bet he feels rewarded far more seeing excellence in his students and their enthusiasm,or how the hall is always packed. And I hope his students will never cease to make him feel appreciated for cultivating love of learning and his unique teaching method.
@@margodphd It would? In my university it is normal / customary to applaud the professor (just not with clapping your hands but knocking on the table). Is that not just a sign of respect? But the pilot thing 100%, boomers are weird
If we all had a teacher like Mr. Lewin, we would be drinking 5 tea with aliens in an other galaxy
fr
Disagree
cringe
very high probability
Aliens don't exist
I don't know what I'd have done without these lectures! They re-instill my passion in physics. You're a great man! Thank you for impacting the lives of many :)
:)
True
@@lecturesbywalterlewin.they9259 Sir, Please refer a book for Linear and Rotational Dynamics
Sir, you are an inspiration to me. I am now in Love with Physics.
Certainly, '"Teachers who make Physics boring are Criminals." :)
Your absolutely true
A great series of lectures. I went through graduate school in molecular biology and somehow came out the other end with very little knowledge of physics - it was mostly irrelevant to what I was doing at the time. So I am age 63 now and have decided to fill out my education, mostly because I wanted to understand the two Theories of Relativity, which are hard to appreciate if you do not know what led up to them. So I started studying more classical physics and now I am hooked. Among the sciences, physics has certainly achieved the most; asking questions about the age of the universe the underlying nature of the world, and showing us that it is stranger than anything we could imagine.
I started out with the Caltech course “The Mechanical Universe” by David Goodstein filmed sometimes around the late 1970s (which for me makes it easy to imagine I am back in college). It is more than just a physics course, it is almost a course in the history of Western civilization, showing how the various ideas in physics evolved. Some of this is quite weird. Kepler, who was the first person to accurately describe the orbit of planets mathematically, was a kind of mathematical mystic, who believed that orbits of the planets should match Plato’s six ideal forms. Although this particular idea was wrong, the orbits turned out to follow perfect ellipses, so in a way he was on the right track. Of course we now take it for granted that we can describe all sorts of phenomena in the universe mathematically, but to step back to Kepler’s time - it is a bit odd that this should actually be true. I came to Dr. Lewin’s course because I found that the explanation of the mathematics was more complete, although as Dr. Lewin says, it is the concepts not the math per se that is important.
“The Mechanical Universe” is also on UA-cam as are many of Richard Feymann’s lectures from an even earlier period. One thing that is interesting about watching these older physics courses is they mention ideas that are works in progress, and you have the great advantage of being able to zip forward to 2018 and find out what happened.
Whenever I do not understand a topic of what my physics teacher teaches, I come around and watch it from the professor and the topic becomes as clear as water. I would be delighted if you were my school physics teacher. Lots of respect for you from my side, professor :)
you have to pay a good chunk of money for a better education unfortunately
@@digitalsiler why can’t we rely on Walter lewin sir for physics :(
@@JayPatel-ol6ox Education quality in US just much better bhai
Must say sir, best online physics lectures I have ever seen. Straightforward, simple explanations, amazing demonstrations, and a legend of a teacher. I wish you well!
Indeed, nowadays this convertion of at least some of the "brake energy" is very common in almost all new cars, fossile fueled or electric/hybrids. I believe perhaps BMW was the first manufacturer to use it, in gasoline/diesel cars, maybe around 2006 or something?
Many thanks for putting out these fantastic series for the benefit of students all over the globe! It is amazing!
Greetings from Trondheim, Norway!
Formula 1 probably first used the brake regen technology
@@digitalsiler everyday cars technology “trickles down” from Formula 1 constructor’s R&D since the very beginning. Look it up it’s very interesting.
you are a legend! I watched this video since middle school!!! I just love watching it over and over and over again!!!
Now I am a college student major in physics
:)
Your waistcoat is just glorious!
TRUUUUTH!!
This is Maraş icecream salers waistcoat
Professor Lewin is a magnificent teacher, and the posting of these lectures is a priceless gift.
:)
MIT students are extremely blessed to have a teacher like Professor Walter Lewin.
Walter lewin is blessed to have many students that happily follow along 😊
Dear sir , I have always been a lover of physics and now since I am in higher classes I am really feeling the way world works and your lecture gives me a way to connect my concepts in real world ,, the way you teach is really appreciable...
Thanks for providing such gems free of cost!
Lots of love from India sir!! You have my respect .
Pulsars are so amazing - especially with your explanation. Thank you Professor!
I am in 11th right now and i read somewhere that watching Prof lewin's lectures would help me a lot for jee prep n they're amazing indeed 🙃 it's true you are father of physics legendary teacher
lol hi there me too 2023 batch
it is but sometimes they take it to the next level
Same here ... btw jee 2025 ??
@@Physicslover0193 for sure
@@Physicslover0193 2025 🖐
It boggles my mind why he doesn't get a round of applause at the end, very few people have that ability to possess the power to understand, convey and keep up the thrill of the subject at the same time, salute to you
Rotating rigid bodies - my favorite topic! A big thank you to professor Walter Lewin for getting the concept of rotational motion not in by head, but in my blood. I can feel the beauty of it all around!
Here is a very cool demonstration that everyone can perform on their own. I was personally baffled when I first tried it.
Take a book and shut it down with a tape or a rubber band. (Thin hard cover book preferred)
Don't take a square book, by the way.
What I want you to do now is throw it up in the air while giving it a spin.
You have three ways to spin it. Let me tell you the axis' of rotations.
Hold the book in both hand and take it in front of your eyes. All the axis of rotation goes through the center of mass.
1. Along an axis that goes from down to up.
2. Along an axis that goes from left to right.
3. Along an axis that goes straight through the book.
Now that you know how to spin the book, give throw it up in the air while giving it a spin.
NOTICE that there is one axis about which, if you spin it, it starts wobbling quite abruptly. It will be harder to catch the book when you spin along that axis.
Try this demonstration and try to understand why it is happening.
Hint: The axis that gives you unstable wobble is the axis through which the magnitude of moment of inertia in between the other two.
Hope you like it!
Veritasium has a nice video explaining this effect “the bizarre behavior of rotating bodies”
~18:00
Lol to be a physicist. None of those pesky engineering restraints.
The flywheel is silly in a practical sense because of angular momentum and torque. Lewin will do an excellent demonstration on this phenomena in the next few lectures. I've no idea how a car will actually react to this flywheel but the physics is probably quite interesting.
It's 2016 and this lecture was ~2002 I believe. He was right. People have been taking it seriously! In Formula 1 it's known as KERS - Kinetic Energy Recovery System. This is possible because of very powerful batteries that have been developed since the time of this lecture.
PHYSICS PREDICTS THE FUTURE!!! (APPROXIMATELY)
It was 1999!
TheDatolo97 when I was born🎉
The flywheel would need a universal mounting and enough space to move around, otherwise taking corners could get interesting.
Of course, with more recent electric cars braking sends current back into the battery, so accomplishes the same thing.
@@marcinna8553 One could also use contra-rotational flywheels, so that the angular momentum of the two flywheels adds up to zero. This would eliminate the nuisance of gyroscopic effects getting in the way of steering.
Yes Its true that this channel makes you love with physics ❤.
Really your video helps lakhs of students to understand concepts easily.
A HUGE THANKS FROM ALL OF US .
I'm a fan. I've watched a lot of your videos, and I think you're an amazing instructor.
:)
Formula 1 cars actually use heat from the brakes to restore some electrical energy for their hybrid system.
A modern perc predicted by dear Sir .
Very cool
in all of this lesson there's only one thing blowing my mind...how the hell he does that trick with the chalk to make the point lines? all the rest is just trivial
ya.. went deep into thought about hand placement and how this could be achieved, oops, back to studying . p.s. i have no idea
You just have to loosely hold it from the tip and point it down towards the line you want to draw, it's not hard at all if you try it a few times!
put your finger in the middle and use the chuck from his head, it would "jump back" (beacuse of the 3th law, you use force so the board will give the chuck the same force back) when you'll slide it across a board
Sir your lectures helped me alot to grab concepts of any problem in physics . I'm a lover of physics like you but because of the education system of India , I'm not able to focus further .. Literally here everyone is in race to acquire marks ,no one is in the track of understanding the concepts,my classmates also just memorize every term in our textbook ,it makes me annoying sometimes...BUT THE BEST PART WHEN I see your lectures is it helped to focus on that particular topic... Sir salute to you. If got a chance I want to be a student of yours... THANKS SIR
:)
Same problem man! I feel you
Don't forget: knowledge acquired memorizing disappears in few months, knowledge acquired understanding concepts lasts for the rest of your life. Then, if you're gonna attend Physics or Engeneering the notions you understood will help you in advanced classes whereas your classmates will have to start over learning/memorizing:)
why not make a group of physics anthusiast and discuss some fruitful ideas...
I totally agree! It is highly painful sometimes when I want to think, imagine and enjoy some of the beatiful concepts of physics, and then I come to realise, as everyone here says, that I must solve these 40 problems a day, memorize theses whole lot of equations, and shut myself up for the sake of syllabus and these exams. It really feels awful.
I have seen your lectures many times, I always come back for remembrance! You are great Walter! Thank you!
You are very welcome
Lies down the road
Greatest teacher of all time.
Studying physics at uni and these lectures are gold. If only my lecturers could teach like prof lewin!!
If it's not Dr Walter who else will teach physics to a comprehensive level
Sir, I am class 11 student from 🇮🇳India, your teaching is awesome, you made me love physics❤
Bhumi
There will never be another Lewin. He was, by any account, a superior physicist whom I believe exceeded the likes of Feynmann and Murray Gell-Mann
Because of you're great enthusiasm sir! my love for physics never fadess
21:10 With one flywheel the angular momentum would point perpendicular to or away from the road (depending on its rotational direction). When driving up a hill there will be a torque applied to the flywheel causing the net-momentum to flip the car over on either the left front and rear wheel or right front and rear wheel.
I think in order to make the concept work, there have to be two counter-rotating flywheels to prevent the car from tipping over sideways when riding up or down a hill.
Sir just love your videos.
I am doing bsc in physics and i cant tell you that how much these lectures have helped me.
Thank You
V=wr where v is linear tangential velocity and w is rotational velocity and r is the radius of rotation..
I never studied, did not show up to one lecture and avoided tutorials is physics, I just watch this man's videos before tests and get a 95% in the class
Considering the (i think previous) idea that decreasing moment of inertia has influenced the tectonic evolution of earth. Thanks for great lecture(s). peace and love
sir i have a jee revision exam coming up and i was behind in portions and your lectures are the ones which are lifesavers... thank you so much sir
It's my pleasure
This was breathtaking...I got goosebumps in this video...Just this subject is something else.
YOUR TEACHING IS EXTRAORDINARY SIR!... A precise channel name, you are making us love it
So nice of you
AWESOME .........MIND BLOWING PROFESSOR.. ARE ALWAYS GREAT PROFESSOR OF THIS ERA........
Thanks, Nikhil, for your very kind words
@@lecturesbywalterlewin.they9259 hey Walter do you like Indian kids ?
@@chupbey7814The hell dude? What kinda question's that lol.
WOW you are one of The Best teachers
When I was in 11-12 then my best teacher was @nitin vi sir now you are my fvrt one .
the flywheel in a car concept is like the mechanical version of regenerative braking system in electric cars
I'm a maths student with a project involving the inertia tensor. Currently in the process of fully understanding inertia and this was super helpful
29:00 voice change? why?
that vest qualifies him as the king of mechanics.
🙂
sir i can underdtand all topics but i cant put in paper
hello sir i really loves your lecture. I can remember the day when our physics teacher gives us lecture on damped harmonic motion in just 5 minute, i want to study that topic in more details and luckily i find your lecture on damped harmonic motion "vibration and waves" and from that time, and upto...... today i watch all of your lecture.
I also got your book "for the love of physics" .
I can't meet such a great conceptual teacher like you in my life.
I really thankful to you.
please accept my LOVE.
I have never seen such kind of beautiful way for living physics..no one can do these things except Lewin sir glad to be in front of u respected sir
:)
@@lecturesbywalterlewin.they9259 can I be in contact with u on social networking site sir..me an IIT student.
*the only way that my one million viewers can communicate with me is on this UA-cam channel.*
@@lecturesbywalterlewin.they9259 from where can I get ur complete series of lecture of whole bachelor to master level physics sir?
@@lecturesbywalterlewin.they9259 your small student from india..I became fond of ur lecture...eager to talk with u sir..
Thanks a lot sir , it helped me lot . I'm in love with physics . Thanks sir hope you be a noble awardee
I love your Afghan traditional jacket. Thank you for your great lectures.
This man is a fantastic teacher!
:)
thanks for your higly valued contribution towards explaining the beauty of physics
People are so lucky these days to have this available free of charge. Is there a text book that goes with these courses?
This is one fabulous vest, Professor. I always wondered what is the source of the quirky, large pins (like the strawberry one) is that I've seen You wear during previous lectures in this series, they are quite unique.
"Back to that in a minute... well not in a minute." What he meant was "in a minute with a large margin of error."
I love every Physics teacher ❤
Your lectures are extremely helpful.
Greetings from Nasik, India 🇮🇳
Glad to hear that
That vest is a game changer !!
Mr. Walter Lewin, You're a Life Saver!❤
6:58 The Indian subcontinent needs to get its shit together when it comes to education.
A great teacher for sure.
Eres un genio, que sabe transmitir sus conocimientos en forma divertida. Lo máximo.
Gracias por tus amables palabras
Today I bought a Hybrid car, using similar principles after 7 years of this lecture
Hello Professor, I'm Himanshu from India , I'll be taking my JEE Advance examination next year and rotational mechanics is considered a very difficult topic, can you give some advice on how to feel the problems based on rotational mechanics and any material I should prefer. Is it possible to contact you through any media if possible. Thank you!
A comprehensive level of teaching Physics
Yes. Please say what part you enjoy
Whoops I know you are going to say all of it. Lolol
fascinating lecture. Neutron stars make the topic of moment of inertia come alive
Always curious to know what next you will tell in ur lecture . U are just incomprehensible. The best Prof of this decade. Made me love❤️ physics. Sir I have been watching ur lecture since my 9th grade. Thanks for all the things I got because of you. :-)
:)
Well I am from India and a jee advanced aspirant....sir love your lectures...I just came here to understand moment of inertia...loved it .. thanks
Me too I came here to revise
:)
sounds like a perpetual motion machine. The jets on the Crab Pulsar are Amazing. I love that image!
Literally two seconds in and this stuff starts making sense... I know my physics professor is trying his best but I wish he would take this approach more and leave the "turbo encabulator" stuff out when teaching fundamental concepts.
professor how do they convert mechanical energy to magnetic energy ? I just wanna know the name of the phenomenon or just something relevant ,I searched for it on the internet but didn't find anything,can you give me any search terms or something please :? thank you ps: ive watched all you 8.02x videos
+InventTwig You first convert mechanical energy to electrical energy. Then you use the electric energy to create magnetic fields in a solenoid.
henrykolm.weebly.com/mit-magnetic-lab-1961-82.html
Thank you professor !! :))))
is this helpful for JEE aspirants(JEE ADVANCED)?????
Yes ofcourse
I would love to have you as a physics professor!
cool waistcoat professor !!!!!!!
Sir why MIT is covering our 11th and 12th class syllabus ,,I thought there must be high level studies??
Keep in mind that MIT is only a very mediocre University. That's why only 101 people who studied at MIT or who lectured there received a Nobel Prize. *That's very embarrassing.* Luckily you got a much better education.
@@lecturesbywalterlewin.they9259 sir why u dont recieved nobel prize 😒🤔🤔
@@sheetalchaudhary2799 Lol, that's insulting actually.
The fastest man to make a dots.
Mad professor ❤
Do you still remember the name of the textbook you mentioned in your lecture?
I am reading University Physics by Young and Freedman, Physics for Scientists and Engineers by Knight, and Physics for Scientist and Engineers by Serway. I want to get the book associated to your lectures so that I am not confused by different notations used in different textbooks.
8.01
Physics
Hans C. Ohanian
2nd edition
W.W. Norton & Company
ISBN 0-393-95748-9
8.02
Physics for Scientists & Engineers by Douglas C. Giancoli.
Prentice Hall
Third Edition
ISBN 0-13-021517-18
8.03
Vibrations and Waves by
Anthony French
CRC Press
ISBN 9780748744473
8.03
Electromagnetic Vibrations, Waves and Radiation
by Bekefi and Barrett.
The MIT Press
ISBN 0-262-52047-8
Lectures by Walter Lewin. They will make you ♥ Physics. Thank you very much. Merry Christmas.
Lectures by Walter Lewin. They will make you ♥ Physics. Do you have the pdf version of the textbook by any chance?
Sir I have a question I also love physics about the theories and concepts and but when it's time for numericals I stucked don't know why my mathematics is notvery nice but I have a curiosity to study space and astronomy so what can I do ?
Start with arithmetic, most of math involves concepts to derive an expression but when working the actual problem having a good foundation of arithmetics will make it easier. Studying number theory really helped me with the understanding what to expect out of the behavior of any given number. I might just be dumb though.
sri can we have the lacture note of the classes which may help us to understand more
8.01 ocw.aprende.org/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/
8.02
core.csu.edu.cn/OcwWeb/Physics/8-02Electricity-and-MagnetismSpring2002/CourseHome/index.htm
8.03
mit.ucu.ac.ug/OcwWeb/Physics/8-03Fall-2004/CourseHome/index.htm
@@lecturesbywalterlewin.they9259 tq very much sir . the way of
your lactures are ❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤
Namaste sir you are best teacher for physics i am from India thanks u so much dear sir
these are great lectures.
i am using them to study for my upcoming physics 101 test, but i cant seem to find anything regarding the theory of relativity.
did i just miss it or is it not available?
Yes we find moment of inertia about any line then we can find across any other line by moment of inertia + md^2 where d is the distance between the given line respect to which moment of inertia has been found and we have found moment of inertia about ring and disc 1/2 mi^2..
Love you sir , you are the best!!!!
That west he's rocking is exquisite
Thank you sir , for this great explanation, i am a jee aspirant and i was unable to understand rotational motion from my teacher. You make it easy for me . before this lecture rotation motion is a impossible task for me. Once again thank you sir , you are the best teacher.. Love you from India
You are most welcome
Wonderful lecture as always! I've got a question, during the talk about pulsars you said it wasn't well understood why, but the pulsar on the Crab Nebula was "blinking" at us, by that I inferred that it wasn't something predicted in the equations, so how did they know that it was the pulsar that was blinking when they adjusted the frequency to obtain the pictures? Since they didn't know wich one was the pulsar and they didn't know the pulsar would blink, how did they know that the pulsar was the blinking one and found the frequency? Thanks for your amazing work!
Sir you are legend!!!☺️
Really sir, I am happy to see such type of lecture...thankyou so much ....I want to meet at least one time..
Always welcome
Finally I got your book ‘for the 💗 of physics’....it’s amazing to explore new and new stuff as each page passes💜🙏🏻👼😁😃😄...Your jacket is kinda a bit too different but much more amazing...I have got a doubt 🧐! You said at around 28:33 that rotational K.E of sun ☀️ might be converting into the heat and light and accordingly you predicted the time but what about the reactions of hydrogen and helium..those nuclear reactions must be releasing enormous amount of energy...isn’t it?
LISTEN again to what I said - I never said what you think I said
@@lecturesbywalterlewin.they9259 Okay sir got it! Thank you
Amazing video. Learned a lot. Thanks.
Why is moment of inertia proportional to R^2 and not just R?
Experiments bro
Reason 1: because the linear speed associated with rotational motion of a rigid body, is proportional to the radial distance from the axis of rotation.
Reason 2: because angular momentum of each constituent particle is proportional to the distance from the axis of rotation.
Both reasons together become why moment of inertia is proportional to r^2. The calculus that determines moment of inertia integrates r^2 for every infinitesimal mass element dm.
you're the man!!!!!!!!!!!! thank you
At 3:38 , how did you draw so many dots so quickly
BTW you are an awesome teacher .
Ultimate Pirate he actually has a video explaining how he does it. Basically He doesnt draw the lines with his hand completely perpendicular to the board but instead tilts it in the opposite way of motion, so when he goes for the line, his hand bounces a little off the blackboard creating the dotted line.
look up slip stick effect
Second Parallel Axis Theorem : 11:30
www.google.com/search?safe=active&source=hp&ei=jhsFXdmmHI-WsAXQnYKoCA&q=parallel+axis+theorem&oq=parallel+axis+&gs_l=psy-ab.1.0.0l10.2033.6686..8296...0.0..0.271.2586.0j13j3......0....1..gws-wiz.....0..0i131.C1xAanz9Tj8
Sir, a question:
I just want to know what was your daily routine during
1)Your school days
2)Research
3)Teaching
4)Now
We also want to know how hard you worked to become so successful in your life. We would be so happy if you make a video on this. Thank you so much once again sir. We love you a lot. May god (In your view, if exist) give you lots of health and hapiness. Please reply.
I discuss all this in my book "For the Love of Physics"
Who is that at 24:14
Sir,which book did you follow?
The lecture is from 2001 and Hubble was already in orbit by then, still you guys didn't have the a Visible Spectrum of the Crab Nebula, i guess it hadn't been assigned the observation yet.
What book were they using?
I wish I had people like you as my prof