Lec 10 | 8.01 Physics I: Classical Mechanics, Fall 1999

[anisk696]

awesome lecture.........



[bluestring32]

Wow what an amazing teacher----

Is that a banana on his shirt

[daathscream]

I'm Hooked to Walter Lewin's videos!

[miaaaaism]

Lol "and that's not very nice of course to do that to a spring"

[kingboy909090]

physics works and walter lewin rocks

[NeoKaiserFleet]

The way he drew that dotted line @ 1:38 was really impressive!

[mdiem]

Walter Lewin is a freaking rock star!

[mdiem]

@44.36

Yes, physics gives me a religious experience too. :-)

[makrisj]

BE the experiment. Thank you, sir.

[oelefante]

I accidentaly clicked the dislike buttom. I feel like a criminal

[makrisj]

@oelefante Don't worry, Physics police is on their way! lol

[violetmoonster]

Great teaching out there.

[Arkady22]

@10:23 Run for your lives! Physics stopped working!

[Starkahad]

I LOVE the way Walter gives his lectures

[ramoreal66]

I hate Mechanics! I have an exam tomorrow and I don't know shit!

[ramoreal66]

@JONN3H I got a full mark, and no this wasn't part of my exam, smd.

[aryan9thunderbird]

best lecture ever



[Dave67004]

These students will never forget that the period of a pendulum is independent of the mass. My (dreadful) school physics teacher should watch these lectures to see how teaching is supposed to be done.

[Nettikadlez]

@kristijan0kroflin Linguism is a social science, and there are applications of linguism in for instance Google Translate. I kind of agree on certain of them, though.

[Nettikadlez]

@kristijan0kroflin Why are social sciences socially incompetent?

[wewtneel]

im curious maybe some ppl know whats with the banana? srry i havent watched his lectures b4 it looks fancy

[romorano]

In Indonesia I can't get this kind of smart teaching way

[nivu007]

i wonder how the moving blackboard stays at rest??



[isop9021]

OH MY GOD!

[gamemaster014]

"now here comes the 64 dollar question. What is the uncertainty?" Lol Walter Lewin rules.

[fuzzyhunty]

coolest fucking teacher ever

[superparleg]

I HOPE IF I COULD ALSO TEACH LIKE HIM.. SO ENERGETICALLY... HATS OFF TO YOU PROFESSOR..

[superparleg]

this lecture is purely awesome.... toooooo good for dull students...

[dannypoissant]

The exam was not too easy, and the class was not above average. The professor is the real hero.

[rebelbloodfeel]

why does he wear a banana??.any one

[Obleddo]

@29:12 How does he do that with the chalk!?

[PATTON0318]

@Obleddo He is magic

[dominant08]

40:09, "The pendulum WILL ..NOT ..SWING!!!" lol

[fyckthissht]

11:20 pure awesome

[rbarju]

If only all physics lecturers could make SHM this interesting...

[s0methingcatchy]

Professor... YOU ARE SO AWESOME!

[taikukaikei]

wow amazing! thats one wow professor. He makes physics come to life. He kept my attention from the start to the end. Amazing!

[DaBhaalspawn]

Damn. I want to live in the USA so I can go to MIT XD

[mick23586]

the ending is epic!!!!!!!!!!!!!!!!!!!!!!

[thecomanche1]

SHO !

[ezcondition]

i hope my Physics teacher is like this

[danpuzz]

this is possibly the best demonstration of simple harmonic motion I've ever seen

[masterackz]

Awesome teacher and lecture. But somehow i feel that MIT need to give him a better microphone.. It seems that he is out of breath every time he finishes a sentence.

[duytang]

Amazing teacher!!

[Rajesh26sharma]

sir.. you are great.. jus love your teaching style.. the thing which we do not understand when our physics teacher explains, we undersatnd by watching ur lecture... they are awesome.. i completed most of my physics chapter frm here.. thank you a lot.!!!!

[Hatimoooo]

Why we don't have such a professor in our school ? :(

Thanks a lot Mr LEWIN

[sarahannstarmer]

Modestly he decided not to mention the third possibility which is that he is an excellent teacher.

[Scelenaarwen]

i dream of the time i get to the point in high school to study and understand cosin and sin of angles and few years after to join MIT .. mmm MIT...

[406356690]

awesome

[miceweasel]

I'd almost call this man a genious. Excellent teacher.

[mastervovan]

nice banana shirt

[StrifeCND]

at the official site

[gubevares]

It is possible to get the exam for this anywhere?

[Fittykent]

I think they're saving that for MIT students. Most textbooks or AP test preps have practice tests.

[gubevares]

Do you think that if i am learning all this lectures very well then i can go MIT and do the exam? i really wanna do it.

[Fittykent]

If you can come up with the $40,000 tuition and the 31 ACT score, then yes, absolutely.

[jimirayblues]

All three exams from that semester are available at the link in the video description. Solutions are posted as well.

[baptistic]

PHYSICS WORKS!!! thanks mr lewin for inspiring people all over the world!

[jayz098]

its amazing how this course follows my physics course perfectly. i watch one vid before my lecture everytime and now always ready for class. these vids are amazing thanks for putting them up!

[darthzydar]

I hope you realize how incredibly lucky you are. I wish these were up when I was 17. Would have helped me make far better decisions :-/

[coolguy6075]

I'm sorry for the last comment i should not of wrote:"wich they are" but "which they are not"

[coolguy6075]

The solution to the last problem is not so hard:

if the forces of his fingers are not the same, which they are: the f max at one part is broken but then the f max of the moving finger is less than on the other because the kinetic friction is less than the static friction

[selahia]

Stop blabalbing about ur high school because u couldn't have done this all with secound derivatives and approximations in ur soo called "12th grade". of H.S.

Watch and Learn don't boast yourself. It looks easy just because proffesor is soo good and.

[dduble07]

They could of done it in 12th grade if they were in an A.P or Honors class

[thejugglenaut91]

ap physics is a joke compared to honors university physics. Much of the time teachers can't teach it well so they teach how to do the problems whereas college physics is much more into derivations and intuition. Of course, there are atrocious college physics professors too.

[david2263]

@dduble07

Very true. Doing the same material in grade 12.

[Diemedes]

@ ariadne:

Παντου στο εξωτερικο τα ιδια κανουνε. Και εμεις στην Κρητη την ιδια υλη ειχαμε στο πρωτο εξαμηνο. Και εκεινοι κανουν αρκετα πραγματα στο Λυκειο. Μην νομιζεις ομως οτι αυτο σημαινει οτι στο ΜΙΤ κανουν τοσο ανωτερα απο εμας. Αντιθετως ισως...

[ariadne911]

nai dikio exeis... emeis stin patra exoume tin diplasia uli se ka8e e3amino px: sugxroni fusiki... exoume ooolaaa k pyrines,swmatia,sxetikotita k o,ti perilambanei i sygxroni apo moni tis..asta..apla stous us tous bgazw to kapelo gia to sustima ekpaideusis k tin upodomi tous..giati piga k se amerikaniko high school k exei diafora..oxi se epipedo..einai oti na nai diereseis stin 1 gumnasiou..alla san egkatastaseis k sistuma se kanei na 8eleis na pigaineis sxoleio, panep ta panta..

[ariadne911]

great professor!! great job! but seriously u have this class in mit? i guess first year right? i'm greek and all this stuff we learned in 12th grade... high school... anyway i also study physics now and i wish i was i mit!! the prof is awesome!!

[MrAtatuerk]

i had the same class at the UC Berkeley. it is a pretty simple explanation of physics. just the simple mechanics with lower apllied math. i had all that stuff in 11th and 12 grade (highschool) in germany, too. you have to recognize that scientific education at highscool really sucks in the US. but the following classes are brilliant and awesome. not comparable to any college or grad-school in europe.

[paperfreeck]

Some students there might have finished high school a few years back. It`s very cool to have such a class in the beginning just to warm up. I NO we have the same class in a 6 mounth course before collage. And the same class runs in parallel with the first year in collage if necassary.

[tabdelmaguid]

Thanks for putting such excellent lectures on YouTube. This is my first time to see an MIT physics lecture and I have a very positive impression about how the lecture is planned with theory and practical experiment given in a very coherent way simultaneously.

[arestes]

i wish i was in MIT now :D

[elementary69]

This course is skilful and fun

[jjalert]

Love the banana button, haha.

For those who missed it, WL explains in one of his lectures that he always likes to wear an interesting button on his shirt. :)

[KarlPhys]

Unnecessarily complicated. Resolving mg along the line of the string gives mgcos(angle). This leaves the restoring force ma = -mgsin(angle) perpendicular to the string. Measuring x along the arc and using small angles gives the result because the arc is virtually a straight line. No need to make any assumptions about acceleration in the y direction. In any case, because the mass is moving in an arc of a circle, there must always be a centripetal acceleration. Mption iso nly approximately SHM.

[zer0s0und]

I agree. Thought it was only me to notice that. I believe WL was obsessed to get an equation in the x direction, to guarantee "carbon copy" with the harmonic oscillator one. To much concern with form, in my opinion, but this is an insignficant objection in face of the wonderful job done in this and all other precious lectures so carefully prepared by him and the MIT team. Congratulations to all people involved.

[PomyslChwile]

anybody knows what is that banana for?

[sipefree]

Physics doesn't work if you dont have a banana in your pocket. Did you not know this?

[kobemj]

i swear physics and chemistry are awesome! 1st i like them but couldnt get any gd grades with them coz i only depended on the info and exercices in the book wich are not quite enough! then i started buying books special for exercices and ofcourse they are corrected and they are quite numerous! so thts wat science is all about, reading from different sources and practicing it!

[a1malik]

@kobemj fukkk im jealous! tht is my method...arghhhh..lolzz

[red619619]

i am a highschool student watching this for fun this is great for next year when i take ap physics. Awesome teacher!!!!

[mbelolombola]

i am a student from sophia antipolis universty in Nice france, in the dep of physics. but never met a teacher who is as smart as you .

[1987dman]

or sexy

[Alfonso1031]

he is totally awesome!!!

i never met physics teacher like him

the way he speak is attact me..

^^

[shayan1386]

you count,this hurts looooooool he is siik ..best lecture

[bean2594]

1. Repeat the pendulum experiment standing up. 

2. Record the new, shorter peried.

3. Solve the period equation for the new effective length of the pendulim (l = gT^2)

4. The difference between the old l and the new l is the height of your center of mass!! It should be somewhere in your torso to double check your measurement

[CiechanPL]

remember to take into account additional mass of your third ball

[rootberg]

Great lecture, I might even do the exercises some day. Physics rocks!

[09205479428]

Very funny instructor. Learning is too much fun!! :-)

[HKSImports]

This is lame you'll die in less you find this wicked fun or something... pointless to learn. Or in cases after learning this comes an outstanding job paying huge bundles of money.

[chopperhead2011]

First Harvord, now this. What other schools will have a YouTube channel?

[mauro2244]

It's Harvard, meat head!

It seems that you could use a basic English course... perhaps you will learn how to spell Harvard!

[chopperhead2011]

Back off buddy, I'm only 15, it's an accomplishment that I can even moderately understand ANY college course to any extent.

[egerboonstra]

lol, he´s dutch, i can tell from his accent

Im dutch too... he really explains it clearly.

I learned this already though....I´m 14..lol

[mauro2244]

...and that makes you a 14 years old Dutch-bag.

[jonoroxxx]

@egerboonstra We don't care.

[Daikokuten777]

What an AWESOME teacher!!

[Charlietheleet]

the better teacher, the better the students

I= T x F

Intelligence teacher fun

[WarzSchoolchild]

Bravo! to the Class of Fall 99! but remember always, that people entrust their lives to engineers! I noticed on the 'Histogram' that a laudable few students achieved 100%. Those are the only engineers it is safe to entrust your life to. Would you fly in an aircraft, where the engineers only just passed at 65%?

!:-(

NOT ME FOLKS!

[llamamebrucelee]

¿¿65 it's pass??

It's too low, isn't?

Anyway, He's the best teacher and his banana is funny :P

[Saskachewan]

Why is he wearing that banana? :P

And how he makes that chalk to draw those dots that fast and precisely?

He's really amazing teacher. I've learned more physics from his lectures than during my whole life! :)

[deavman]

@Saskachewan:

I don't know about the banana, except that physics professors are often excentic. The chalk is placed at an angle on the board, friction makes it "jump" at regular interval, thus the dots.

[fayebeth]

love the banana clip!! lol hes amazing!

[system0slaven]

Theres a reason why the class is good "smart"

Great Teacher

Simple

[CrisisSpirit]

haha! he's awesome!

[cheikhbaidy]

very good

[MaTeMaTiKci]

i wish he was my teacher 2

[jonas199127]

he is genius