MIT Professor Walter Lewi's Physics 801 Lecture10 Part1

Hooke's Law - Springs - Simple Harmonic Motion - Pendulum - Small Angle Approximation

[@rutger5000]

As a high school physics teacher I'm envious of this man. What he gets to explain in less than 10 minutes without any kind of interaction of his classroom takes me at least twice that. I got to relate it to something the students are familiar with (at least according to people who judge my performance), got to spend time and energy in managing the class (high school students are nowhere nearly as well behaved as college ones are), and got to double check to see if the slower kids could follow.

[@davidbourgholtzer788]

idk whether to be impressed by his teaching skills, or his dotted line skills...

[@yugs94]

I've never been good in physics but i guess i've never had so good professors cause i've got it in less than ten minutes

[@LilFrenchWaffle]

His dotted/dashed lines are insane. So fast and precise. Just watched that 2min montage video of him doing a bunch of them..crazy.

[@PlatinumEagleStudios]

I came for his amazing dotted lines and his amazing cursive writing skills :-D

[@rookie4life]

<a href="#" class="seekto" data-time="389">6:29</a> "and that's not very nice, of course, to do that to a spring" Walter Lewis - looking out for springs everywhere since 1966

[@asenath910]

love how he drew that dotted line. awesome.

[@kinnikuchu]

Thats why he works for the MIT

[@gliceriotj]

excuse me errors. 'm Brazilian. I think the banana is to analyze how many people will pay attention to class and how many will look for banana.

[@guilhermefabbri6294]

Whoa, another Brazilian here? Também sou.

[@deepakbellur9676]

Thanks for your kind clarification. I didn't think about the Third Law!

[@psmirage]

The instructors who took the exam didn't have this Professor teaching them. He's the exceptional one!

[@christopherrankin1468]

I was that guy who made the 50%. =P

[@noonesperfect]

if you have question paper please send link over here..... lets see how much score we get? lol

[@3adelz90]

easy things but explained in a simple way. Great professor

[@jackfrost8969]

wow absolutely amazing. my teacher was a trash . but he explained this so damm nicely . i wish i had a teacher like him . i definitely could ve achieved more

[@StimpYJCatZ]

it is so amazing how he draws these point-lines o.O

[@sempervalor1]

Amazing Professor!!

[@TheSacknasty]

this guy is a master of the chalk talk.. a dying breed

[@fmarini]

this professor is so great!

[@rmatveev]

I stuck to the tube!!! The Man is really knows his job very well!

[@haraldlindohf4032]

I bet the banana gives him powers of some sort

[@manuelaximenes5215]

Harald Lindohf LOL

[@tomisoetan9061]

Potassium power!

[@chubb123]

He's a fantastic lecturer.

[@kasaimomar8016]

chubb123

[@user-og6nx1pt1f]

😁🥰🥰🥰🥰I love Pyhsics مو دكتور (بروفسور)ضييم شرحه يجنن

[@rajeshkoppa2367]

Best teacher ...

[@zcb2703]

Id like to see the test

[@totu376]

The second he drew that first dotted line I got lost in confusion and amazement and completely lost focus and didnt retain a single word of his lecture

[@striped_sponge7187]

Totally Tubular hold it from an angle and draw it. 45° angle.

[@habib080]

Wow amazing lecturer

[@antonioalvarez4453]

his lines are perfect

[@vivantstudiosi]

DAMN nice lecture... it is even easy to understand basic and not so basic physics with this teacher...

[@RandomnessPersonifed]

Why does he have a banana and why isn't the comment section flooded with banana comments.

[@seanwatts8342]

+RandomnessPersonified He always wore some things that were from what students were doing at the time on campus.

[@kikodotfilip]

+RandomnessPersonified In his book he says: "'Physics works!' I shout and the crowd 'goes bananas'" at the end of an experiment.

[@ShubhamKumar-ur1vm]

Most of them are full nerds

[@user-kj3cc8nx7h]

Well at list we have a better future then y'all

[@leopoldoastudillo7189]

Mr. Dab the correct expression is "AT LEAST"...and don't tell me it was a typo...and don't tell me you are a nerd because nerds proofread before posting something in a public service 😅👍

[@SuryaPrathaprollnothterm]

Mind-blowing

[@jaldazosa]

Amazing!

[@paolorodriguez2640]

This is gold

[@ArtificialLifef0rm]

I wish I had a lecturer like this in physics class at high school :(

[@maniacalmania]

God, this is the greatest prof ever. Lewin RULES.

[@hulahoopfrootloop]

I'm learning to teach Physics and wish to God my tutor made stuff this interesting! I understand it better when Lewi & Feynman (some of the worlds best Physics brains) talk than the way my tutor explains it. I wish I was clever enough to learn this stuff properly!

[@saabaru9744]

I love maths and the physical education of the maths history and thing of the vortex sulotion of the geomatrys

[@vaibhavchauhan4765]

great......................

[@BrhmhCom]

yes prof ... may be i have to take this course again with this professor...

[@BenzirAS]

Awesome explained

[@amangocitizen3426]

This is a common knowledge that every 9 class student have in india

[@kadiryilmaz7378]

Option 3. You must be an exceptional teacher

[@bluntobjct]

wow, that man can make amazingly straight lines on that blackboard!

[@Pawliukaz]

i wish my university teacher was as interesting as this man

[@kewkabe]

Yes it's 8.01 which is first semester freshman classical physics that all students of all majors are required to take at MIT. Second semester (8.02) covers electromagnetics.

[@alejj19]

that's amazing!

[@parveenkumar590]

Awesome Lecture sir g ,,

[@m4rtincz]

because he's a BOSS

[@dejavuism]

No he's just happy to see the class

[@freakman420]

May the Force be with you.

[@ATSNNews]

great teacher

[@c0c0nutbeans]

I should start watching these

[@beta_trix]

Thank you

[@dwarduk2]

It's the first semester of the first year of the course. They tend to teach everything again so that they are sure that everyone has learnt everything properly :)

[@mrbean1026]

I find it hilarious how people can somehow deduce the quality, or lack thereof, of American higher education based on watching 10 minutes of this lecture. I know it's fun and trendy to mock the US and our supposed superiority complex, but you may want to do a few minutes research on MIT and Walter Lewin. And for the people arguing over which country has killed the most people, is this really the forum for that kind of argument? Seriously?

[@Bmooneyj]

I agree. I wish I had him for a teacher, we need more teachers that can teach like this. America needs this caliber teacher in the elementary and high schools. I would even pay more in taxes to have a excellent science program to prepare our kids to compete against India and China.

[@jimmymax166]

This is brilliant I will remember it forever. My teacher said research hookes law, I came back the better than my physics teacher that's mean't to be a biology teacher.

[@kk141281]

I like the way he made the dots at <a href="#" class="seekto" data-time="97">1:37</a>

[@SuperAudimaniac]

His dotted lines are quite impressive

[@jonasseger]

This is some advanced spring theory.

[@dvdvideo1234]

I LOVE physics

[@darklordfry]

In Canada (and if you look at SAT books) and the States, these are in High School curriculum. What happens is people don't take physics courses, and also that professors sometimes make sure students have firm grasps of ALL concepts before moving on to more difficult topics.

[@Jonathan0656]

He did his dots!!! Day = made

[@quod]

Because physics is awesome.

[@masroor45]

physics super star .......

[@sudaisss]

excellent

[@yahyakharsa5054]

If he only knew.. That the taped banana he's wearing is a 120000$ modern day piece of art

[@Joru666]

In primary school I had a physics teacher that made similarly great impression on me as this professor does now, mind you I study mechanical engineering.

[@ilhamprasetya3884]

how can he make a line of dots like that ?

[@ramankumar-rl7rl]

good lecture

[@jackwilliams8986]

this is the basics of Civil engineering

[@nienos333]

geweldige vent, raar maar hij laat je echt naar hem luisteren. zelfs in engels snap je het

[@dr3alaaelfeqy]

تحفة

[@leonidasNS]

we must take this level of education for free....for everyone...everywhere....

[@mlsfaw]

I read my textbook and i fall asleep and learn nothing, then I watch this and i get everything!

[@hajilemaster05]

Why is he wearing a banana?! xD

[@ArmandoDelVecchio]

for scale

[@mbran96]

Armando Del Vecchio well then. that makes more sense.

[@Maksym3082]

This is probably a testament to how good of a lecturer he is, but I never saw the banana until I read this comment, I was too focused on what he was explaining lmao

[@flawfulpractice8381]

Its his style

[@carultch]

He takes inspiration from the energy source his breakfast provides.

[@Vendettaaaa666]

Im a computer science guy, got fed up with my subject, but I am "entertained" by his lectures !! There is a WAY to teach, not every TEACHER does that !!!! Look at his EFFORT to teach? amazing, ORDINARY TEACHERS expect the STUDENTS to put the EFFORT to learn something !! EXTRA-ORDINARY TEACHERS like him, put their own EFFORT, teach everything CLEARLY, like a crystal !! Thats how it should be !!!

[@craftbuzzwonky4752]

I wish I could be one of your students in MIT!

[@sicarius100]

never thought springs could be this interesting.

[@Andricknight]

you came to iluminate yourself

[@muneebbhat1426]

The thing that made to hate Physics were only numericals because my physics was limited only up to them.watching Walter Lewin I really found Physics most fascinating and loving subject.

[@BMW4979]

his lins cured my cancer

[@RidleyPhantom]

So what if it's easy? It's good info and he teaches it so well and makes it fun

[@petersimonpieters8814]

i Like this, even though i cant understand how quick you should make notes of this at this speed..

[@johnericsantiago28]

its easy to do that line of dot with out moving..i done it before..the secret is hold the chalk not to rough and slide it down then... it will automatically bounce.... . . . but it will irritate your ears .... but you should hold it not that very tight..

[@dave41999]

[@willdejvi2303]

this is what we learn in our last year of highschool (6th year of secundairy) in Belgium...

[@snigdhadobhal9679]

Amazing lecture by walter lewin ! But I wonder how does he make those dotted lines?

[@amitjagtiani5116]

Snigdha Dobhal

[@hitlersothernut8491]

Its a rather simple but often difficult to master trick that uses the relationship between the chalk and the chalk board to basically vibrate the chalk in his hand, by holding it with a loose grip in the direction he wishes to make the lines, applying the right pressure at the right angle and moving his hand with certain speed, he will basically bounce the chalk and create the lines... How he does it straight without it veering of course still amazes me.

[@pirotess2]

+Snigdha Dobhal His magik.

[@deepakbellur9676]

Even I seem to understand! And if I can understand he must be really teaching well. The only thing that I didn't seem to figure out is the Normal Force that seem to act vertically upward. Where does that come from? As I can see it, it seems to be from the strength of the surface that supports it.

[@KnightAivengo]

Yes, it's a third law of Newton. Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

[@herrlunkes]

About the graph....after the deformation, the spring shouldn't returns with a linear proportion? Not a curve as he made. And if yes, is also inclined as the first straight line? THANKS FOR THE ANSWERS!

[@ikrakkentm9588]

We do these things in high school here in greece.We study springs,standing waves,contribution waves, fluids,oscillations,solid mechanics,doppler effect and impacts..And yeah all in one year ffs. And we are being tested on these things in hard problems in order to get into university.

[@mangoman0i299]

iKrakkenTM your country is broke therefore you don't have an opinion

[@FitBikeMaster14]

Too much swag.

[@bigbillybobboone8637]

books finally arrived after first test???? Way to go MIT. My college has 10000 students and we always have enough books.

[@pavitrajain8311]

This topic should be taught in 11standard

[@ae70gts]

professor if you please ... if I take a spring and I extend it or press it not over it's limits and keep it pressed or extended... will it be deformed? worn out ? or a spring is worn out when continuously pressed depressed with in it's working limits ???? please anyone? regards

[@carultch]

It you make the spring out of a ductile material, which most springs are, the spring will continue carrying the load while disproportionately extending with increased load. When you release the spring, it will return along a line parallel to the linear elastic portion of the curve, but be offset, carrying some of the permanent deformation. The spring will be permanently cold-worked and deformed from its original length. This becomes the new length, from which you restart the process if you load it again. This failure mode of ductile materials is called yielding. The material continues to carry the load after exceeding its yield strength, the stress vs strain relationship is no longer linear, and the deformation is permanent. Apply a load even higher than this, beyond its ultimate strength, and it will rupture completely. If you make the spring out of a brittle material (which you will seldom[if ever] find in practice), it will rupture the instant it is taken beyond its strength. Brittle materials by definition do not yield. They rupture immediately after exceeding the strength limit of their linear-elastic regime.

[@prasispoudel7353]

i think banana i being used to suppress a kind of anxiety(as banana helps mind to relax) so there will be no loss of short term memory due to frustration . It may had been used to suppress depression ( if he has it )

[@VerdantSkies]

I think you have some confusion on the numbering system used for MIT courses (which probably isn't helped by the fact that the title of the video is incorrect.) MIT's courses are named in the form X.Y, where X is the department number and Y is the course ID. This course is 8.01 - Classical Mechanics, in Department 8 (Physics). It is the very first physics course taken by MIT undergraduates, and is one of the General Institute Requirements, which should explain why the material is pretty basic.

[@predatortheme]

I wish that was my Math teacher / physics teacher...

[@chrisgriffin712]

I heard that rf (radio frequency) and ac (alternating current) the same and would like to know if you agree. If this is true then quantum physics starts to make sense in reference to the slot experiment mystery which shows matter as waves of energy (rf I am assuming) unless observed at which time behave as particles. I might be putting apples and oranges together in my limited understanding, but even buckyballs were used in the slot experiment showing the same results as photons and electrons. It all seems to dovetail if we are actually in an audio video broadcast. What are your thoughts?

[@carultch]

60 Hz electricity does give off 60 Hz radio waves, but they have almost no power to really affect anything to any practical degree. It is how radio waves in general are produced though. The radio station does generate an AC signal that is close to the frequency of the radio station's carrier frequency. Suppose the station is 100.1 FM. It will vary the frequency of this AC signal in the neighborhood of 100.1 Megahertz, in accordance with the waveform of the sound it is carrying. Your radio receiver then picks up radio waves in the neighborhood of 100.1 MHz, converts them to an AC signal, and then isolates the modulation from the carrier frequency, to produce an AC waveform that can drive its speakers.

[@MattyHild]

@SimeVidas1 As far as i'm aware it's first year review.