8.01x - Lect 24 - Rolling Motion, Gyroscopes, VERY NON-INTUITIVE

This Lecture is a MUST. Rolling Motion - Gyroscopes - Very Non-intuitive - Great Demos.
Lecture Notes, Torques on Rotating Disks - Gyroscopic Behavior: freepdfhosting.com/c294f9033b.pdf
Assignments Lecture 21, 22, 23 and 24: freepdfhosting.com/2e96daf94f.pdf
Solutions Lecture 21, 22, 23 and 24: freepdfhosting.com/86109d309b.pdf

[@frankservant5754]

How can one not LOVE Physics when taught by such a man!!

[@lecturesbywalterlewin.they9259]

:)

[@javierlopezkalder3576]

Lectures by Walter Lewin. They will make you ♥ Physics. Can I send you an Email?

[@lecturesbywalterlewin.they9259]

my email is strictly private.

[@javierlopezkalder3576]

Lectures by Walter Lewin. They will make you ♥ Physics. I Would Like to purchase your full collection of videos and writes.

[@lecturesbywalterlewin.they9259]

I have DVDs of all my lectures. I have only 1 copy of each lecture. I'd be willing to sell to you all my personal 36 videos of my course 8.01 for $7000. New copies can no longer be made. My extensive notes for each lecture - with time marks - are not for sale. I can send you a signed copy of my book for $30 + postage. Postage is $10 in the US, $30 to Europe and $48 to India. I will write a special note for you in the book. I will also include a signed colored picture of me swinging on the pendulum (with your name written on it). For an additional $25 (+ postage) I will send you a signed and dated 24x18 inch sheet of paper with my original handwritten calculations as I post on my Bi-Weekly Physic Problems. I will send you 2 such sheets for $35 (+postage). They are the originals - *thus one of a kind - there are NO copies.* You can see 3 such sheets in the video in which I solved the yo-yo problem of 2 weeks ago: kzbin.info/www/bejne/q3KyhH6hmburmc0 When you transfer the money to my PayPal account let me know your full name and your address (make sure it is correct and complete). Keep in mind that PayPal charges 6% for each transition. PayPal: [e-mail]

[@DiarmuidKeaney]

This is exactly how physics should be taught in schools and college. Theory-Practical Demo and understanding of the application. Well done Walter Lewin, I love your passion for your subject.

[@lecturesbywalterlewin.they9259]

:)

[@sowmyag5142]

Yeah

[@xavierpoes4985]

WanderAbroad I beg to disagree. there are many theories for which there is not, or at least for some time there wasn't, a clear application. This doesn't make them useless.

[@bashisobsolete.pythonismyn6321]

@WanderAbroad i am british. educated britons know all about history and politics. that's why we are a nuclear power with satellites in orbit that can see into the earth and show us where the minerals are. that's why our diplomats have fingers in all the pies. that's why we control oil in Nigeria and gold in Ghana. that's why South Africa is ours (soon). no revolutions or great depressions setting us back. British American Tobacco. Anglo Dutch Oil. Lloyd's. BAE Systems. East India Company. Professor Lewin knows all about history and politics. that's why he was a top-level academic with tenure.

[@cemasti4524]

If I design another way of teaching the same concepts in physics u would fall of ur chair. Hint; in my teaching method no classroom no sitting no instructor or very little of it. All action.

[@richmac918]

This has to be one of the most passionate professors I've ever seen. Those who have the opportunity to learn from him are lucky.

[@phoenus]

we are all lucky!

[@Arty_Zik]

Yo

[@danigarrablanca]

He is not a professor, he is a MASTER

[@saadhassan8813]

Technology has made all of lucky

[@uluhitah12]

we are all lucky, because we can watch his lesson from KZbin.

[@lorcankelleher5434]

I have been studying engineering for 6 years. No one has ever explained dynamics in such a tangible way to me. Thank you.

[@lecturesbywalterlewin.they9259]

Great to hear!

[@-leelakrishnan1970]

I had a craze to enter IIT,but it was a difficult task to crack the entrance test at that time.There were several ifs and buts.Now in this digital world,everything you get at the click of a button The lectures of the greats like professor Lewin, you could not imagine in the past.Long live the professor so that we could here more about physics.

[@rapskallion]

A pleasure to watch this man's emotions. He loves to teach.

[@SpaceMissile]

"i only have to act enthusiastic one time, film it, and then play the lesson to next year's class."

[@davidgillon6187]

Great!

[@OSVSL]

You shouldn't smoke weed and do homework because next thing you know you watch a whole lecture about physics and you don't even have a physics class.

[@KyroMania]

and i was about to go to bed

[@douglasfisher4068]

O S V S L bro I’m high as well watching this while procrastinating for homework what the hell lmao

[@krepkygrimes5002]

O S V S L Heh heh heh.

[@J__C__]

What u mean? I'm not even in school! 🤣🤙

[@reymartinez2242]

It doesnt mater is you smoke weed, Mr. Lewin has captured your attention. In the society we we live in now. Its nice to see a true hero, someone who loves learning and education. I smoke weed, and I find myself being inspired by Mr. Lewin. 1.8 million views. Thank you kind sir.

[@margodphd]

I usually don't believe promises made by channels - but this one indeed made me love physics EVEN more. Thank You, professor, for allowing us all to have access to these wonderful lecturers, for free, worldwide. Equalising access to education is an important humanitarian effort.

[@aravinda513]

The guy who bunked this class would regret for life😂

[@Arctodusangustidens]

I loved your lecture, I am a 50 years old biologist and I am planing to see all of them! you are an awesome teacher! Thank you

[@danceswithstone]

Somehow, this lecture always end up back in my feed. I've already watched it a couple of times, but a year goes by and. . . there it is again. So, I watch it again. I don't have the time to watch it again, but I do. . . VERY NON-INTUITIVE.

[@samhouston2000]

I am watching second or third time again, I don't know why either. Very Non-intuitive.

[@johndoesson]

My guess is the youtube algorithm, they have discovered after x time a significant portion of people will rewatch something because most often they forgot they watched it and will make the same decision like the first time (to watch it). I have fallen for this several times.

[@florencegomer7937]

My guess is people are looking for revision material before impending exams and those extra views cause the algorithm to promote it as a recommended video ...

[@matthewkemp8658]

Agreed

[@2pointSummer]

I remember this at my first year of technical mechanics course.. it was the most enjoyable class I have ever taken and this takes me back. thank you Walter Lewin for sharing your lectures with us.

[@ramyhuber8392]

Always so wonderful to have an excellent, passionate teacher!

[@mileschun143]

"If you have problems with this, you're not alone. See you Wednesday."

[@daddysnip6397]

i love it

[@Tom-cn4cm]

@@daddysnip6397 I too love it when teachers leave their students feeling helpless! After all, actually understanding the content of the class is for losers!

[@user-xl5kd6il6c]

@@Tom-cn4cm Classes are to learn, not to spoon feed you. The thinking and understanding, has to be done by you alone

[@51KTM51Hurricane]

Hahaha a good one

[@thierryfaquet7405]

@@Tom-cn4cm teacher can't make you learn something. They can only present you the matter. Obviously the presentation's quality is of importance but only you can do the learning.

[@HarmonicaMustang]

THIS is why I love university lectures on any subject; the lecturers are passionate for their subject, they're experts in their field, and will not hesitate to throw a pen at a disruptive student. I've still got my notebooks full of hand-written notes and diagrams from my studies at uni, I treat them like the golden essence of knowledge they are. I've got plenty of academic books that go more in-depth on various practises, but I still refer back to my notes simply because they contain the significant key points. Lately I needed to learn something I didn't do at uni that's related to my field, and once I got a better understanding I even turned to some fresh pages in these notebooks and made further notes. I need to photocopy them and archive them as a PDF because losing them would be a great loss.

[@lucadellasciucca967]

Did you make the PDF? pls do!

[@thewalloby]

I love his lectures, every time i say 5 minutes just to see what it is, i am stuck for an hour...

[@zellous2928]

I have to say professor lewin, this is my first time taking physics in college and I come to your lectures to gain deeper understanding of the material, and you truly make me smile and just pause the videos some times to be like wow that’s awesome physics is amazing. Most of my professors at my school are very good at what they do but some just can’t capture the enthusiasm to get us excited about physics like you can. For that thank you! And congratulations to you for nearing 1 million subscribers. Forgot to mention, your book “for the love of physics” is also very good as well!

[@harrysingh3888]

I can literally watch this lecture lying down on my bed, cause this is more interesting than Netflix for me.

[@dw734]

At the end of the lecture I wanted to give him an applause. The man is an legend among teachers.

[@markpointer2967]

Hello Sir! I graduated with an MSc in Applied Physics from a highly regarded university here in the UK (unfortunately, no, I didn’t make it to Oxford / Cambridge! I would have tried harder, had I known. But then, isn’t hindsight a wonderful thing??!), a number of years ago. For various reasons (and again, I would go back and change things if I could), I have never since worked in physics, or science, though I keep a keen interest. However, your lectures are just fabulous, and I think I’ve watched all - or nearly all - of them. They have re kindled my interest, and my knowledge, which had turned very rusty! They make superb viewing, on many levels, and thanks to your online lectures, I’m now actively looking at returning formally to the subject. I have not decided on the exact route or goal of mine, but if I hadn’t come across your lectures, it would never have gotten the ball rolling. And, yes, I believe it is a Perfect Roll! :-) Thank you again Sir! M.P.

[@Intwademala]

Look up "Power Ball Hand Exerciser". Its a dual axis Gyro that is powered with a simple flick of the wrist. Try and put coils and magnets in it to make a hand held power generator.

[@BrienCoffield]

If I would've had a physics professor like this, my profession would likely have been different. What an incredible lecture. This is what teaching should be.

[@grenzviel4480]

I would be horrified if I knew that there is an exam coming, but for me to just watch it is pretty nice

[@mohammedluckman4947]

I just wish he was my physics teacher because my love and understanding for this subject would be different today! Such an excellent teacher truly amazing if only other teachers taught like this!

[@callmeandoru2627]

for the first time ever in life I understand Gyroscopes. Thanks Walter Lewin so much. you are the one Physics teacher that everyone in this world need

[@justanotherperson2960]

Thank you Professor Lewin! I am preparing for spaceflight dynamics interview and I was a bit nervous on the torque computation. Your video is brilliantly simple for me to understand some fundamentals which would otherwise be "phenomenally unintuitive" as you put it! Salute!

[@johnbrevard5966]

He isn't teaching. He is Purely making the minds Think and Absorb. Bravo for the amazing Info and Enthusiasm

[@NativeNewMexican]

This lecture is one of my top 3 favorites, I'll be looking at more of your lectures to come. (The other ones were about the Ruben's Flame tube and inertia)

[@hasham77]

So damn amazing , never had such a lecture in my whole engineering. so envious, what a quality education they are having 👍👍

[@lecturesbywalterlewin.they9259]

:)

[@bluehome8193]

16:52 "How is nature going to deal with that?" Brilliant, just like the whole lecture.

[@rcarendsen]

I totally love this visual way of teaching... people tend to understand it better than numbers and formulas alone... And you can see this teacher is enjoying teaching ... 🥰 that also motivate the students

[@jjvideo8349]

Bravo, I would have loved to have a teacher like you 50 years ago, and beeing able to re-watch the videos untill full comprehension, thank you

[@alex89paredero]

6:04 I don't know what I'm doing here. Great lessons Walter Lewin, these leesons are impressive

[@AhmetD..]

35:30 - 39:13 : Such an amazing lecture.

[@FATH3RoO]

mind blown

[@josephb6161]

I've seen so many of Walters videos, he's fantastic! Wonderful teacher, really keeps me engaged

[@wanderingbardess]

His book” for the love of physics “created interest in me for physics. Genius and true teacher of our time

[@edwardjacklewis]

... the unchanging nature of the knowledge does not make this lecture out if date!

[@prakashbokati7392]

If there were a Nobel Prize for Best Teacher, I'm sure you would get it! Thank you for being such an amazing person and true inspiration! Thanks from Nepal!

[@lecturesbywalterlewin.they9259]

:) :)

[@billyjack8119]

40:25 i did that when i was 10 years old. Not sure why but it was fun at the time. I used to take ice cream buckets with a funnel stuck through with a hose on the other end. Fill the funnel with flour with a lit candle beside it and snap the lid on and blow. Nice flour explosion. Ya 40 years later and all i do is go to work so my kids can sit in classes like this. Well keep up the good work A+

[@tonybrowneyed8277]

the physics department at mit had, and has, quite a few outstanding professors. perhaps the best of all is mehran kardar.

[@durgeshnimse6678]

What a man.....never visualized these dynamics in such a wonderful way .......thank you Walter lewin sir for sharing it...read your book and it really made me love physics ....need these type of teachers in Indian schools ❤❤💛💛

[@JAXi9321]

This is how teachers should be. I've had the pleasure to meet few ones with the burning love towards their "subject" (can't find right words) & teaching, but mostly they're just there for some other reason (or lost the "love"). Absolutely love him and his lectures.

[@jakechung9295]

From time to time, I watch Dr. Lewin's lectures to check my English skills; how much I can understand his talking, just only his talking in English. It's a very beneficial way to study English for me. On top of it, I enjoy re-discovering the remarkable knowledge about the beautiful universe we live in. I always thank for his efforts on "der Wissenschaft!"

[@miguelangelsimonfernandez5498]

an outstanding lecture. You and Mr Feynman are my all time favorites

[@lecturesbywalterlewin.they9259]

Thanks Miguel

[@b9r0m85]

Walter Lewin ^ Richard Phillips Feynman √

[@rich1051414]

My favorite Feynman clip: kzbin.info/www/bejne/hX2ZXqtmotSXrbs

[@davidschmidt6013]

I recently retired after teaching for a bit over 20 years in several of the top international schools here in Thailand. I can only say that I wish I'd found this gentleman's lectures sooner. But better late than never , as I used many of his lectures and videos on rolling masses to help my middle school kids wrap their heads around basic concepts of physics. Bless you, Dr. Lewin.

[@francescocuccu4218]

You have no idea how helpful and inspiring you've been for me. Thank you very much.

[@lecturesbywalterlewin.they9259]

You are so welcome!

[@razaqalmarsoomi6757]

Excellent lecture, great teacher, I wish he was my teacher when I was student.

[@il2648]

the best lecture about the stability of spinning wheels ever!

[@derangedpsychopath]

Gyroscopes are super cool. It becomes very intuitive when you spend some time looking at it. Thanks for free cool lectures, professor .

[@curtyahn6556]

Ik vind je lessen geweldig. Je brengt natuurkunde tot leven, meer dan enig andere natuurkunde onderwijzer (in meest brede zin van het woord). Love your lectures. Physics lectures as they should be. Rekindles my love for physics big time.

[@prernasharma7395]

You make physics feel so interesting, Sir! Thank you so much for this amazing and intriguing lecture! :)

[@mahmudulmilu8683]

From my childhood, love and attraction for physics is in my heart. Meanwhile I became a Biomedical Engineer. But when I watch the lectures of Professor Lewin, I think I was born to be a pure physics student. Love and respect Professor Lewin.

[@ctx4241]

My teachers didn't bother to bring their notes sometimes, this legend has whole motor, hanging hook to have axis for spinning objects, whole gyro for demos. Life's not fair :D

[@zainabhussain3887]

😂

[@darthtagnan12]

Hi, I’m from Quebec in Canada. It’s a real pleasure to watch your lecture. You were a really good teacher. I don’t have the background but I like your lecture .

[@sagniksaha7359]

Hello sir I would like to thank you for these wonderful lectures. They are truly amazing. Thanks to these lectures, I developed a love for physics and I am happy to say that I will be starting college at Cornell University this fall as an undergraduate (majoring in physics). Although I may never get to meet you in person, I would just like to express my heartfelt gratitude for everything you've done for us. Thank you professor Lewin :) Regards

[@daviddonaldson288]

How is class going I’d imagine phy2 is coming best of luck with electricity

[@ElectricExperimentsRobert33]

Nice demonstration..

[@joseph-mariopelerin7028]

Zzz... useless! Just like you need math to calculate how long you going to stay airborne while jumping in the air....

[@barrybernau4957]

Electric Experiments Roobert33 6

[@vivid2474]

Pure awesomeness.

[@jacobvandijk6525]

But at 18:51 the experiment is non-sense!

[@michaelhills5463]

A tremendously gifted teacher.....preparation, practicality, applicability -- essence of teaching

[@johnmacri7440]

Incredible service to be able to watch. I love tuning in here vs the news and I love having no homework

[@md65000]

"The angular momentum vector chases the torque vector" -- I was having trouble with this topic but as soon as you said that it all came together-- I understood it perfectly! Why can't textbooks and (other) professors explain these things so plainly and simply?!? :(

[@Tobeon2]

I have Ph.D. in Environmental Engineering, but I want to go back to school for physics now!!!! WOW, what a great teacher he is!!!

[@ashrafali4297]

God bless you!

[@huanghaoyang9359]

Best teacher ever..learned so much and greatly inspired by Mr Lewins. hope to meet this great man one day!

[@Nodjia]

I still find myself wishing I was in this man's courses. He does a wonderful job of explaining non-intuitive physics. We need more educators like this.

[@jasminekharazmi7047]

Non-intuitive physics? I sense pretty a lot intuition behind it.🤔

[@Ajinkya738]

This is the actual teaching method, Walter Lewin teaches from his heart 💓 💓 And I love the gyroscope concept.

[@SameBasicRiff]

7 seconds in "calm down" LOL makes me feel like I'm right in the class haha

[@AdityasEPFC]

The best demonstration on gyroscopes on the internet. I'm currently studying Gyroscopes for Aircraft Instrumentation and found this very helpful. Thank You Mr. Lewin!

[@lecturesbywalterlewin.they9259]

Wow, thanks!

[@GrayStrider]

Thanks, KZbin. This is the kind of recommendations I want to see while studying Physics in my lyceum. Thank you very much for lectures! I love Physics even more now

[@ajosefrancos6694]

It's clear that you have such a clear understanding of the world around us, I am Design Engineer and I have seen your Lectures countless times. In my opinion, you are the best lecturer in the world. Thanks for sharing Kind Regards, Angel J Francos

[@lecturesbywalterlewin.they9259]

Thanks for you kind words

[@SpocksBro]

Imagine doing the wheel precession experiment in front of a crowd just a few centuries ago. You'd be burned for witchcraft.

[@whoopshoopadoop8900]

I had a similar thought. The court wizards were probably just physicists. "Me lord! Check this shit out! Wheel falls, right? Makes sense. But now look at it! STAYS UP ON ITS OWN! MAGIIIIICCCCC"

[@MisterIvyMike]

@@whoopshoopadoop8900 Burn the Whitcher!

[@bigmike9527]

you are exactly right. !!

[@MichelJosephCardin]

Yes and I am thinking that; still today; this is a mentality state that humanity is stuck on.

[@jimleane7578]

Now i know why witches rode broomsticks not bicycles

[@adamhughes4442]

Watched the entire lecture. Brilliantly delivered and utterly engaging!

[@PrinceAlhorian]

I can remember a public lecture where the idea of fast spinning gyros/flywheels may in some way be applied to negate heavy masses in industrial applications, anti-gravity without the anti-gravity, the professor stated. But it was the torque that always come up as the main problem, and having two gyros countering each other negates the forces that gave the setup the ability to seemingly defy gravity. Didn't understand half of it but was extremely fascinating.

[@luca4229]

So this explains why on my motorbike when going at a reasonable speed, if I want to lean on the left I have to push on the left handle instead pulling it towards me! It always seems strange to me as logic would say "turn left = turn handlebar on left" but doing like this I actually turn right. Thank you for this lecture, angular momentum, spin angular momentum and torques were the hardest argument of physics to understand (to me) and you really helped me a lot with your demonstrations; this demo, in particular, is very enlightning.

[@lecturesbywalterlewin.they9259]

:)

[@Demki]

And it even tells you why you want to lean to the left in order to turn left, because that applies torque to the wheels which turns the axis of rotation to the left. :D

[@anomalyp8584]

Yes indeed!!!

[@zzpazi]

There's more to motorcycle steering dynamics, it's actually pretty complicated. In addition to the gyro force, you're also deflecting the support point (wheel contact to road) from under the center of gravity, which also tilts the bike. The actual change of direction, and the amount thereof, is then another matter entirely.

[@GC9010]

Not to mention the decaying circumference of the wheel as you lean further over causing the path of the bike to follow that direction

[@maheshrajannan3416]

Oh my goodness. This is such a quality lecture. Thanks from India and USA.

[@woodychan3925]

Thank you professor. You help me understand how counter steering works on the motorcycle which push the handle bar right , the bike lean right

[@djurodjuranovic4299]

This just reminded me how impressed I was the first time I saw my physics teacher draw a dotted line just by angling the chalk on the board :D

[@e-pi5189]

Your lectures are awesome. I had spent months pondering around different websites , books etc . but still couldn't get a visualisation for this topic ( esp. ) you cleared all of it in an 1hr ( -10 min , 48 sec ;) ) . Can't thank you more !! P.s. Hope we had teachers like you in India !

[@lecturesbywalterlewin.they9259]

:)

[@e-pi5189]

BEST DAY OFFF MY LIFFFEEE !!!!! WALTER LEWIN REPLIED !!

[@lecturesbywalterlewin.they9259]

😊

[@sagarshenoy]

Great video. Walter Lewin is amazing! In India too, there are some amazing teachers and I am lucky to have attended lectures of a couple of them, but yes, these kind of teachers who don't just speak, but 'show physics' are rare in every country, including the US :)

[@onahuchenna8921]

@@sagarshenoy You're right! Passionate teachers are rare in every part of the world.

[@mizar52]

Very good explanations , with excellent examples . I'm french , and I would have liked to have such a teacher, 20 years ago . And We had only equations on the board, and no equation explained . * * * * *

[@lecturesbywalterlewin.they9259]

:)

[@VestigialHead]

+mizar52 Yes I totally agree with you. I loved the experimental side of physics but because the teachers had a very dry way of showing the maths I quickly became confused and turned away from the field. I regret this now. The internet has shown just how good instruction and teaching "Can" be. What stuns me is I had assumed that modern teachers would watch the innovate ways of teaching on the web and copy them. But the majority do not. they trundle on with their archaic outdated methods and wonder why most students get bored or left behind. People in charge of education have a lot to answer for. Thank you for your passion Professor Levin.

[@tokiniainaricky8588]

salut mon frere

[@ammarfarooqui8331]

Such an Amazing video! What a passion Sir has for what he does! I understood this phenomenon clearly for the first time ever. Great Video Sir.

[@marclambert1172]

Fabulous! What a lecture! How many teachers should learn from your talent. Thank you

[@richardcarew2481]

When you really understand a subject, teaching others is easy because the concept can be passed along very easy with easy to understand language... even very complicated ideas... most people, for instance, think math is hard... we are taught that in school by every teacher we have... math is not hard at all, but when people who don't understand it try to teach us.... it teaches us that... math is hard.... my father was a nuclear physicist, and around the time I learned how to read, my father explained the basics of calculus to me... I was 3.... what he did was: described the flight of a ball thrown by hand... arcs, acceleration, basically, Newton's laws of motion.... it was clear enough that I have never forgotten the lesson... I gave my own son the same lecture... he was in advanced college calculus in 7th grade.... watch Richard Feynman to see what a real teacher is like... The laws of motion, like mathematics, are pure logic... with logic, all of this is clear by measuring the variables correctly... if this... then that.... Boolean logic... Peace

[@abcdonkeys]

44 years ago, my first job was as a rebuilder of bicycles.. I used to spin a front wheel on a bench grinder wire wheel.. I found the force interesting.. there is magic in this force, I dont think we fully appreciate this force..

[@mrjleex]

You do every time you ride a bicycle. It keeps you up.

[@oximas-oe9vf]

This is so mind blowing, it's messing with my head. you look soo happy doing this, god bless you prefessor

[@cesarmenezesvieira8788]

Mr. Lewin is always really amazing, but this lecture is incredibly outstanding. You can watch this video many times, and it is always awesome. Thank you very much, Sir. Greetings from Brazil. :)

[@AuroraClair]

I wish we had a professor that teached with such passion

[@AuroraClair]

Also, thank you for making these videos available to the world!

[@gabriel1812]

*taught (fixed that for you)

[@AuroraClair]

@@gabriel1812 tnx lol, I guess my English got a bit sloppy x)

[@colfaxschuyler3675]

"With our knowledge of torque... CALM DOWN .. With our knowledge of torque..." Who can remain calm when we're taking about TORQUE!?

[@62saki91]

3 am, you tube algorythm: hey wanna learn about physics for rolling motion and gyroscopes? Yes.

[@bugelpavel]

Same, man, same..

[@NihangShah]

Same. But, it's 4am. So easy to learn with practical examples.

[@e-1632]

Give me more

[@greenmarine5]

such a complicated instruction to such an easy project implemented in such an interesting way. Excellent lecture on keeping the students interested Proff.

[@renzilvales8573]

Such a interesting lecture ... Well thought.. great demos .. great teacher .. ❤️

[@sudarshanbaruah2557]

gotta fall in love with physics once again... after so many years...

[@magsarbatkhuyag2945]

I love watching your lectures. because i am physics teacher, I always learn from you how to teach in an interesting and understood way. thank you

[@justinvalkry1223]

I knew Newton's law of motion but I've never seen it actually written out and fully explained in a side-by-side comparison demonstration this is absolutely fascinating and I completely agree it is fascinating that you can change any minor component and you'll still reach the same conclusion

[@tommyv4980]

23:05 I don't know why, but I had the biggest smile on my face when I saw him starting to spin from the torque vectoring.

[@MasamanG]

i enjoyed it, and kinda get glimpse how physics work.. while im a Social Studies student

[@hey_shivam]

Amazing lecture ❤️ Well I have learnt all things in class but there was no demonstration like this

[@johnjosephmercadante6664]

This is something we experience everyday but we have been acustom to these facts but never question it. I've learned that everything has a reason for acting a specific way, most just except things, question everything, the reasons may surprise you. I’ve experienced these facts but never knew why, I've just found out why, Thank you.

[@luiscolon7195]

Love this professor, I wish he was my teacher in high school. Love how he takes the number into practice

[@gustavtd]

This is not a high school I guess?

[@dammy5786]

@@gustavtd nope it's MIT

[@CSJiGSaW08]

This guy is amazing, already graduated, but wish I would of seen this or been there in those years. FML

[@NoosaHeads]

(14 minutes). The hollow tube lost the race but as the incline approaches 90 degrees to the horizontal, they will both arrive at the finish line at exactly the same time. As the incline approaches zero degrees, they both will arrive at the finish line at the same time - ie infinitely long. I'd like to see a graph of the time taken for each cylinder -v- the incline angle.

[@carultch]

Interesting question. One factor you might not be considering, is that the equation derived in this lecture is based on roll without slip as a condition of this problem. On a 90 degree incline, if you still maintain the roll-without-slip condition, you will find that they do NOT take the same amount of time to fall. If you were to actually carry this out, you'd find that there is a breakpoint where the contact turns into roll with slip, which voids the equation derived in this lecture. But there is an example we can give, which would still allow roll without slip on a 90 degree incline, and still use the formula from this lecture. Suppose you had two yo-yos, one with a string around a solid cylinder, the other with a string around a hollow cylinder. Upon dropping them, the yo-yos are not in free fall like you might expect. Instead, there is a tension force pulling tangentially, upward via the string. This will slow down the yo-yo with the greater ratio of rotational inertia to m*r^2 when compared to the other yo-yo, where r is the spooling radius.

[@spenzr6920]

That was awesome. I finally grasped why the wheel starts rotating like that and stuff. It truly feels incredible! Physics is awesome

[@gallectee6032]

"The hollow one lost, and even fell on the floor" at 13:34 that made me laugh because the last part is so irrelevant that it was funny.

[@temporaltomato3021]

Just pointing out how much a loser the hollow cylinder is in total.

[@generalralph6291]

Prof: See you next class! Me: Oh. No, thank you, professor. I’ve already learned all I can learn in a lifetime.

[@lecturesbywalterlewin.they9259]

Excellent!

[@Pavel_draganov]

@@lecturesbywalterlewin.they9259 hello sir, are you from the netherlands?

[@Thobbek]

Powerful man, Knowledge is making him explain it so easy because he understands it really well. Thanks for the class :D

[@ellisc.foleyjr9778]

I'm 78 yrs old. and I just happened on this video. always been fascinated by gyro's. I seen one on a troop ship I was sailing on back in the 60's, anyway lets just say I was disappointed when the video ended. I was just getting warmed up!! what does that say about Mr Lewin. ? one hell of a teacher, when you can hold the attention of the young and the old!. fascinating. Thanks for the video and thanks for sharing.

[@Robertalamouimoui]

This is fascinating, I would have liked you were my physics teacher

[@lavik472]

Wow, doing PhD but the love for physics increasing a lot, the same how precision increases due to heavier mass. You have drank physics, now you are pouring it on us. One of the difficult concept of physics Many thanks

[@toosiyabrandt8676]

HI That would be PRECESSION!!! Shalom to us only in Christ Yeshua

[@leopardtiger1022]

Fantastic i have saved this lecture to watch it again and again. Thank you Herr Professor.

[@sugarkhang02]

Thank you for your lessons. I can clearly understand what you said and know how to solve my problems ❤