i am a medical student from india and i still watch your physics videos! you’re the best physics teacher i’ve ever come across and thank you for making your content available to us, Professor ❤️
Really very sorry about that sir, I just started watching your lectures and am watching them one by one. They help me a lot and the content provided by you is the best on RU-vid. Your videos help me understand the concepts better and keep me engaged in the study of physics too. Just keep uploading this content and we will always be thankful of your good works sir. Really appreciate everything from your side! And i would try my best to cover up the syllabus and would never miss your video, they are indeed filled up with great education and help a lott!!
@@RUPAM_3_6_9 Just scroll down in the playlist section! His folders are named as 8.01, 8.02 and 8.03. Each is unit wise and starts from 8.01 ! You can also find assignment question answers etc over in the section!!
Respected Sir , Your dedication towards Physics and impact on us students is never forgettable. You do make students love physics who weren’t able to solve the numericals through your amazing, experimental and dedicated teaching!👏🏻🙏🏻
Professor, as an undergraduate studying ECE, I just wanted to thank you for all your videos, which are of tremendous help! Without them, I would have a much harder time learning physics during my freshman year. I understand your frustration that your channel is not reaching a broader audience, especially when you are very passionate about sharing the beauty of physics with the world. Please do not feel too disappointed! Your hard work is much appreciated by all who have learned from you! Also, people's interests vary, so you cannot expect everyone to love physics. Other physics channels or educational channels may have experienced declining view counts as well. However, for those who want to learn physics for whatever reasons, they will inevitably find your channel and be inspired by your lectures in the end.
Hello Professor. I just finished your 8.02x lecture 16 on Electromagnetic Induction and Faraday's Law. Wonderful lecture. I'm not in your course but I am one of your students in the global community. Thank you for spreading the wonder of physics. Best regards from Florida.
Despite your disappointment in your current students, I would like to let you know how much your lectures on youtube helped me. I am a chemist who became a high school chemistry teacher when I was 57 years old. As I prepared for my first year of teaching, my school informed me I also will teach physics. I bought some physics books and found your lectures from MIT. All summer I watched your classes, and studied my book. I started my teaching year and continued studying physics. At the end of my second year, I took a PRAXIS exam for physics. This exam demonstrates a persons proficiency in their subject. When I sat for the exam, I was the oldest in the room by about 35 years. PRAXIS is graded on a pass/fail basis with a special distinction for students attaining in the highest 10%. I made it: the highest 10%. I credit your lectures for that honor. Thank you.
Your class on rainbows made me curious about the angle of the sides of the Great Pyramid- reflecting pools around the base and maybe a glass cauldron of water on top, nothing extra fancy. I'd love to build a model. I'm 40 years old and watch for fun. You definitely deserve the respect of our full attention when we view. I wish i could dedicate more time, thought, and memory to everything that you've shared. But, I can only imagine that I'll be watching you for many more years to come (or as long as i am still among the living.) You should always be celebrated ❤️ You've earned it.
I can truly understand your frustration regarding some people's behaviour that come across as unappreciative, something which is compounded by the emotionless nature of social-media, YT in this case. However, I want to stress the incredible impact you have made on thousands of people, myself included. I remember the first video I watched of your channel, the one about fluid mechanics and hydrostatics. It fascinated me beyond comprehension, it was as if everything I have thus far learned, finally*, "clicked". It was also that video, which ignited a renewed interest, as well as an outlook, regarding physics. *You* were the reason, for my renewed passion of physics, something for which I am incredibly thankful. Thank you, Sir. You are deeply appreciated.
@@lecturesbywalterlewin.they9259 I'm from northern Sweden, but I really appreciate what you are doing. dont let internet trolls get you down. You are making one hell of a difference. More power to you sir.
Don't get dissapointed Proffesor, you will always be my favorite teacher and a legend in clarifying and explainning Physics with or without the Demo on Polarization next Tuesday. Nonetheless please do it!!😊
Professor, I truly understand your disappointment, and I'm sorry, but I can't help but express my concern. I don't know what has caused the drop in views on your videos, but it seems quite drastic. You have dedicated so much time to teaching this subject and educating students online. However, as someone still in the learning stages, I find it challenging to grasp some of the points you make, especially since I'm still working on understanding the basics. I hope you can understand my perspective and the difficulties I'm facing in fully engaging with your videos. It appears that the audience has dwindled, and there seems to be waning interest in the learning material you share. On a positive note, I highly recommend that you consider joining Twitter. By posting daily problems and sharing the content from your RU-vid channel, you could attract a different audience and potentially monetize your presence there as well. I'm confident that you will receive tremendous support on the platform, as Twitter is known for having an intelligent user base. I believe it's the right time to explore new avenues to reach a broader audience and make your expertise more accessible to people like me who are eager to learn. I genuinely hope this suggestion brings positive results for you.
why should prof lewin care about how much view his videos get? it's a passion of his, I don't think it matters to him. and people who need his videos WILL ALWAYS find his videos.
Extremely sorry sir, please don't be disappointed sir, for years you've provided us with the best content in physics sir, we are indebted to you and hearing such words truly affect us. We will work harder sir
I didn't even know there were problems to solve. Am learning a lot of studies the correct way, finally. Have rewatched a few of your videos at least 3 times. Want to undestand those before moving on to the next videos available. Love your content. Your time and effort is greatly appreciated. 💪💖🧠🤓📚
As a high school student who was doing late studying for AP exams, your 8.02 lectures on Electricity and Magnetism were a godsend: videos were compact, interesting, and informative, and I managed to still get an OK score despite the short amount of time. Thanks!
Dear Professor, I have watched some physics videos and I like how you explain, I have a concern that I would like to know your opinion on. There is a person with a gun, who shoots from a distance D, what conditions must be met for the kinetic energy projectile to hit a person? Consider a real laboratory, I imagine that the wind, projectile temperature, recoil must be measured. of the weapon, and a family of angles in an acceptable range to hit a person standing at that distance D. Although the problem posed is a projectile launch, widely studied in a physics instructional course, when analyzing a real case, a probability of impact must be considered. Greetings from South America
Dear Sir, please do not disappoint. There are people who will skip the video but we valued your lessons, knowledges, and advices sir. Please keep teaching. We valued and very much appreciate your effort sir.
Professor Lewin - It's probably the summer and just lots going on during that weather but I've always enjoyed and learned a ton from your content. Thank you!!
I subscribed to your channel some time ago and I can only hope to have the time to even begin watching your content in earnest! I enjoy the way you present the material and I wish my university lecturers had the same passion and flare that you bring to these subjects. As soon as my 13yo son starts being presented with physics rather than just "science" we will be sitting down and tackling the foundation physics topics, watching your content together. Thank you sir for all you have presented so far and I look forward to engaging more in the near future!
Dear Walter your lectures are very interesting and you inspire us all, I go through all your lectures because they are very interesting and pass them on to teachers and students, thank you very much, you are a role model for all of us. Continue your activity, we want to learn everything possible from you and want your recommendations to continue so that we can educate a better generation and create a better world for everyone.
Dear Mr. Lewin, I have loved your teachings and I have tried, yet failed, to be consistent in following all your videos and solutions. Yet I want to ask you, please do not be discouraged as this material will outlive you, maybe now in the present we are not watching it in full, but someone (if not us) will reference back to it. I will be, like many other viewers, eternally grateful for your time.
Hey there professor I'm actually in 9th grade and I understand your videos very well , they have really helped me perfect newtons laws and I have watched all of your old MIT lectures too , you have really inspired me to do further and be a better version of myself , you are the best physics teacher in the world , God Bless you ! ❤
I recently found your RU-vid videos. Your wonderful demonstrations, passion for physics and dedication to your students are so evident in your lectures. I took 8.01 and 8.02 in the early 80's. Although my physics professors were very good, I wish that I had the opportunity to have been taught by you; it could have influenced my chosen major! Thank you, Professor, for making your wonderful lectures accessible online. I hope to have a chance to view them all!
I have never watched a single one of your videos, have no idea who you are and don't have any clue behind the context to this video, but this was suggested on my homepage. 10/10 would watch again, thanks Professor.
Dear sir !!I used to be a physics teacher and used to teach students physics by referring to your videos!!Although I have completely shifted my teaching career towards teaching English but I still watch your videos because I still love the way you teach physics!!🧡🧡🧡🧡🧡
I am so sorry sir, I was preparing for my test tomorrow and my mobile was switched off whole day. I will try to solve the Problem Soon and Waiting For Your Home Experiment. Love from India ❤
I have not gotten to relativity yet, I never got past mechanics or electrodynamics in full. But I thought about gravity and Einsteins vision of it being bending of spacetime. I then thought wouldn’t gravity then exhert a force like fabric exhert normal force to the ball else it goes through. I then started to imagine what if the fabric was not really there, what is this region was simple the coordinates in space and time where least amount of energy is spent. I then started to think deeper, if it is minimal energy spent then anywhere outside would naturally require more energy and thus it would be almost like a rubber band like a force steering the object to stay within the region. Since light travels the shortest path and least energy spent naturally is along shortest path, this means light would also travel on this region. Then I started to consider this was truly about mass and energy, and the must be other conserved quantities not part of energy and have their or minimising quantity phenomenon. Then I started to think maybe we could class matter as a ratio between conservered quantities in a stable state, almost like the quantities are the buckets and a fixed amount of water that can distribute itself across the buckets. This daydreaming gave me inspiration I should redo classical mechanics proper and really self teach myself to a level I can start communicating and investigating my ideas
Sir we are very excited and looking forward to the experiment.. And I've already planned on performing it at home... Please do not feel demotivated.. I'm always there first watching your videos..
Hi sir I am from India... I like your videos a lot as I am an engineering student your videos help me a lot to understand my topics.. please continue your classes for us
Sir I am Student of class 12th Science [Non-Med] , I don't know my Future... Please guide me... I like Physics and Maths... What I have to do in Fututre... ?
@@lecturesbywalterlewin.they9259 Thank You Sir for Replying me But Sir I accepted you as my Teacher Sir you are best my teacher and a man who inspired me to study and understand Physics.... Please Help me.... ~ Dildeep Singh Insan [From India]
@@divinoholicI will recommend you to think about how you want to be in future as a physicist, as an Engineer, as a teacher or anything else it's about what you want to be
I will watch it now it's the very least out of respect for all the time you spend in thought and action for the benefit of others trying to learn. Your lectures are my reference guide to understanding physics. Thank you
Hi Professor Lewin - Physics and the universe is fascinating -still full of mysteries and wonderment. Your site is one of the best that shows that fact. You should consider yourself lucky in life to have touched and influenced so many students both young and old. I am now 77, a retired chemist but still fascinated with the field of physics. I just wonder what lies ahead of us in the new physics particularly along the lines of Bell's inequality and entanglement. Thank you for your service to humanity!
I don't watch all of your videos but when I start one, I watch the whole thing. There's a problem though. I'm generally too stupid to ever come up with a correct solution to a problem and on top of that I'm generally too stupid to completely understand the solution once provided. As a result, I don't ever really say much in this channel. Cheers.
I just got this video recommended to me and have no idea what he is disappointed about. 🤔 I know, I have to go and watch some video that asks me to do some calculations or experiment. But, since I haven't been a student in 40 years, I will pass on that. 😂
Respected sir, we admire u so much. We respect your time and will do everything to make u feel respected and loved. Dear sir we love u and appreciate u. And solution no. 176 is gonna be watched by all of us as soon as possible. We love u. I LOVE YOU❤
unfortunately at this point of my life I don't understand much about physics to understand your videos and lectures, but I still enjoy watching them ❤ have a great day professor 🌹
Hello professor Walter lewin i am ananya Kumari I read in class 10 those who try never give up 😊😊 You are very disappointed so feel here very not at good and all students they feel support and you are looking good and better than teaching 🙏🙏
I’m sorry Sir, I’m not a student of yours and I’ll never consider myself smart enough to be. However I love to learn the Electricity & Magnetism from you. I love the dedication you have to Educate your pupils, and I thank you for it. Please stay with us Sir, I also had a question about some Theoretical Physics if you have the time someday I’d love to email you on it. The ones who paid for your service and treat it with this lack of respect are doing themselves a huge disservice by cutting corners and cheating themselves. With Newtonian Mechanics, homework sets and watching explanations was how I was able to get the concepts in full.
Professor you are helping us so much i am still in 9th grade but I'll study from you in the future. You are helping us. We r sorry for disappointing you ❤
Dear professor, a stone doesnt make a bridge. I follow your light since 2007. Your lessons are a precious act of love for the phisics. This is the way to show that the love for a thing is all that we need. Sorry for the others that not appreciate this lessons.
I really love your work and I study in class 9 and I watch your lectures and love the way you teach. Truely a master at work.....Really sorry for your dissapointment.
Love you sir❤🙏 from India, you are best professor and lecturer across the world in my era, i am doing bachelor of science in physics honours, i regularly used to watch and learn many more from your youtube lecture video thanks for that, i shall ever obliged to you ,lots of love and respect 🙏🙏❤
You are a true legend, inspiring generations to love science. Your contributions will shape the future of humanity, leaving a lasting legacy that sparks curiosity and ambition in aspiring scientists even when you are gone. That’s something only a handful could say. Thank you for being an inspiration to all.
Hi walter. Sorry about not keeping up. Very busy these days. My wife broke her ankle and i got to do some household too also some problems are out of rwach for me. The mechanical newtonian problems i can attempt. The electrical ones and archimedes ones i normally can do.. many others are very hard for me.
I have listened an learned several things an I plan on doing that right now.Iam much to old to plan any career so I want plan on anything.I just love to listen an try to understand as much as I can.
Yup sir we understand the time you dedicate to solve the numericals with precise explanations. Please don't be disappointed sir. Waiting for the experiment to witness the linearly polarised light
Your video are amazing sir you are inspiration for many students.Your love towards subject is giving me motivation to work hard. Long live sir , regards from India 🇮🇳🇮🇳❤️🤍
I don't understand, and I get very confused by the results of the double split and other similar experiments. There are forces around us that act upon protons in this experiment. Also, it seems clear to me that these forces are affected by the apparatuses that are used to observe them. It's clear to me because of the fundamental law of physics that an object in motion stays in motion unless acted upon by a force, a principle articulated by Galileo. This easily correlates with quantum entanglement and its paradoxes, string theory, dark energy, Bell's Theorem, gravity, thermodynamics, Length contraction, Hawking Radiation, Casimir Effect, Compton Scattering, and a host of other subjects. The eraser experiment is about these forces and their effects on the photon… Since Young’s presentation of a famous paper to the royal society entitled “On the theory of light and colors” in 1801 and his subsequent famous interference experiment in 1803, light was established to be a wave. About 100 years later, it was realized that light showed behavior characteristics of both wave and particle in the double slit experiment (and its variations) had become a classic for its clarity in expressing the central puzzles of quantum mechanics. At that time, there was no concept of dark energy. The current concept of dark energy came about in the 1990s. I believe that dark energy is the reason for the wave characteristics of light (particles). What is one of the most fundamental laws of physics, established by Galileo, that a body in motion stays in motion unless acted by a force is the basis of my conclusion. Numerous, if not all, of the characteristics attributed to particles, I believe, are attributable to dark energy. This results in Einstein being correct; the moon is not visible simply because it’s being observed. It’s always present because these forces (dark energy) are not enough to affect its position in space. Just to be clear, double slit and similar experiments are proof of two things. First, it is proof of dark energy. Secondly, it’s proof of the existence of strings. Little, if anything, is known about dark energy. One of the things they know, for sure, about dark energy is that it’s not detectable; it cannot be observed. That’s why they call it dark. As for the proof of the existence of strings, the interference patterns left by double-slit type experiments are characterized as wave-like. Wave-like behaviors are foundational to the definition of string theory. Finally, is the fact that phenomena, wave-like behavior, disappear when apparatuses are used to observe (detect) those experiments. These assertions are further substantiated by the results of the eraser and similar experiments. Remember that the Michelson & Morley (1887) experiment was one of the most sensitive test of its time. Poignantly, it failed to detect any indication of ether wind stemming from “luminiferous ether.” It just wasn't there, completely undetectable. Not a hint. I believe dark energy is a universal uniformed negative Electric/Magnetic monopole structure. I think this accounts for its characteristics. Also, it’s interesting to note that at the time that Einstein identified Brownian motion, string theory did not exist. I feel that if string theory existed at that time, Brownian motion could have been used to substantiate that theory, string theory. Newton, very cleverly, removed the consideration of curvature from his calculations. He did this by using points center of masses. Einstein put curvature back into the calculations. He did this by cleverly introducing the concept of space-time. I, personally, do not believe that light bends around massive objects because of space-time. The light bends around massive objects because light is repelled by mass, also Hawking Radiation. Additionally, I am confused about the concept of time. I believe that time does not exist when there is only one point, a single point. This is due to the way calculations are done within the framework of Cartesian geometry and not because of physics. There is no place in physics where there is only a single point. Again, and I know that I’m repeating myself, particle physics needs to be transformed into dark energy physics. By identifying matter as having wave-particle characteristics, matter has been mischaracterized. Science needs to be re-focused on the waves observed in the double split and the like, experiments and deemphasize the focus on particles. The concept of wave-particle duality should be abandoned. Schrödinger equation, Probability density function, and, very importantly, Maxwell's equations emanate from dark energy. As a starter, science needs to focus on the waves observed in the double split and similar experiments to determine their minimum and maximum characteristics. This should be done by varying the parameters of the experiments as much as possible. The screen should always be as large as possible. The slit should be as small as possible. The slit should be as far away as possible from the screen. Particles of varying masses and charges should be systematically used. Then all these factors, except fixed conditions, i.e., the results, should be systematically varied and their data recorded and then finally compared and analyzed. Outlier data should not be excluded. This should establish conclusively that a force is responsible for the behavior of the particles and not the inherent behavior of the particles themselves. Doctor Lewin, your physics courses were the very first courses I ever watched; I watched them on MIT online, I am very thankful for the videos that you make. Thank you!
Hello ! Prof . I am from india i have a doubt in physics , TOPIC CAPACITOR ,BASICALLY CHARGING OF CAPACTIOR , MY QUESTION IS THAT IF WE CHARGE A PARALLEL PLATE CAPACITOR THE CURRENT (i) flow in circuit BUT MY QUESTION IS THAT B/W THE PLATE THERE WILL NO CIRCUIT BUT CURRENT FLOW ENTIRE CIRCUIT AND ALSO THERE IS MAGNETIC FIELD B/W THE CAPACITOR WHICH IS ONLY CREATE BY CURRENT FLOW , SO CAN YOU MAKE ME UNDERSTAND WHAT ARE THE MECHANISM , I WAIT FOR YOUR BETTER RESPONSE , THANKS LOVE FORM INDIA ❤ PROF. Welter lewin sir
On a capacitor, the current doesn't flow in DC. The current is proportional to the DERIVATIVE (the rate at which it's changing) of the voltage. The electrons get "pushed" to one of the plates when the voltage changes, which is the current. When you discharge the capacitor, the electrons go back to an even distribution, that rush of electrons is the current. The energy is stored in the ELECTRIC (not magnetic) field between the plates, created by the imbalance of charges between them.
Sir i am busy in your 8.02 lecture. So i rarely watch new video problem. By the way i really enjoy your lecture. Thank you for delivery such beautiful content which still we students watch.
damnnnnnnnnnnnnnnnnn dude you are really a man of work a great inspiration i don't have much knowledge about physics but I'll try to understand and watch your videos to increase my knowledge
De demo is een van de eerste voorbeelden in scheikunde, ik vond het saai op school dus daarom ook nu .. voor mij was het niet erg indrukwekkend. Maar de tijd die u aan eraan spendeerd waardeer ik zeer. Niet iedereen krijg visueel de kans om het met eigen ogen te waarnemen in eigen persoon. Ik vind dat veel scholen te weinig praktijk doen en het ook te weinig laten doen door de leerlingen zelf. Daardoor zakt het animo voor de wetenschap voor sommigen. Ik heb altijd demonstraties gehad. Ik heb ook tijdens biologie menselijk brein mogen vast houden en in 2 delen snijden en een meisje in de klas mocht dit ook. Ik vind het belangrijk dat er meer praktijk word gegeven dan theorie maar dat is mijn personelijke opinie. En ik kom hierop als voorbeeld want ik kan alles herrinderen wat ik heb gezien door het zelf te hebben mogen doen en dat is ook belangrijk. Mensen kunnen iets zien maar met alleen het zien vergeet men snel, mensen moeten het i.m.o. ook zelf uitvoeren om een betere verstandshouding over een bepaald onderwerp te k7nnen visualiseren. En de visualisatie en de kennis die daar voor nodig is vergaat omdat er geen beeldvorming is voor bij het onderwerp want de meesten hebben de demonstraties zelf nooit mogen uitvoeren. Zoals bijvoorbeeld bij chemie hoe je een waterstof maakt van kraan water. Natuurlijk niet idiaal voor radicalen.. maar wel gezond voor een verstandig persoon die zich verder wilt ontwikkelen op een bepaald vlak. Dat is waarom ik soms skip pf kort af ben. Niet om respectloos over te komen. Maar omdat ik de demonstratie zelf al heb uitgevoerd. Ik hoop dat u met deze kennis nu begrijpt dat het niet voor mij heel normaal leek i.i.g. niets nieuws toevoegde aan het geen dat ik al geleerd had. Mijn escusses als dit te hard overkwam. Dat was zeker niet mijn intentie. Ik wens u alle lof toe , u bent brilliant. Maar nogmaals zonder beeldvorming met een praktijk gedeelte waarbij een persoon zelf de demo kan doen onder supervisie zal het beeld voor velen vervagen. In mijn geval staat het pp mijn net lies gegrafeerd. Want ik heb het uitgevoerd in de praktijk dus mijn animo ervoor is daarom gebleven.. het moment dat ik het zie herrinder ik alles. Ik wens u een fijne dag. En ik wil u laten weten dat ik erg geniet van uw demonstraties. U bent werkelijk geniaal en een voorbeeld
Many creators put a lot of effort into their videos, but it's not possible to watch all of them. When making videos on RU-vid, you will have to accept the fact that not everyone will be as interested in your videos. By the way, you could also look at this situation from the opposite perspective: maybe you didn't make the video interesting enough for some, maybe you should change some things to make it so that more people will want to watch until the end.
Hello Sir. Just so you know, RU-vid has a tool in which you can see "audience retention", you can actually know where most people clicked off and how many watched till the end.
Dear Prof. Lewin, I want to please you not to be disappointed. I watched your solution 176 until the end then wrote a transkript for better understanding and compared your solution with a chapter in the famous book Bergmann Schäfer Lehrbuch der Experimentalphysik Band III, by F. Matossi from 1972. Your video gives me much more insights and clearity to the subject of reflection as all my physics books could did. Thank you very much for your work. The subject actually becomes a new importance. The photovoltaic modules all have permanent covers with a sheet of transparent plastic which causes slight losses of light energy. In the future these covers probably will be forbidden due to a contents of fluorine. Instead of this the use of thin glass is in discussion. i planned a lecture on reflection of light. in autumn. So i would please you to show your experiments. All the besft have a nice day. Best wishes from Germany, Johann
