Classical Mechanics | Lecture 1

[@tvaddict7846]

Notes about lecture: conservation law conserved quantaty allowable laws of physics, allowable rules 25:40 non-allowable law (in classical physics) can't retrodict the past (opposite of predict) non reversable if reversed, unpredictive (don't know this or that comes next) 29:20 predictive one way, not retrodivtive other way not reversable, "I" don't call it irreversable 30:10 classical physics doesn't allow probability conflicts with the rules of classical mechanics quantum mechanics are not deterministic ambiguity in knowledge of initial condition, so from this statistics in classical mechanics despite deterministic 33:30 how precise do you know the initial condition, this determins how far you can predict the future, example three day weather forcast other way around, if you know how far you want to predict, then you can determine how exact you need to know the initial condition 35:50 allowable, if every state has one incoming and one outgoing arrow next example: point particle(s) moving in space 37:30 first some preliminary mathematics vectors, coordinate systems coordinate system: describing space quantitatively space with three dimensions/coordinates but we are perfectly free to think of systems higher dimensioned or lower dimensioned 38:10 we are interested in describing the basic pricipals, so we don't have to restrict ourselves to specific examples a particle can move in one dimension, it can move in five dimensions, but for now we use three dimensions 39:30 three coordinates, doesn't matter where we put the origin, but it's easiest to put it at the (? 0 location) the three axis are mutually perpendicular label e.g, x, y, z or x1,x2, x3 40:00 still ambiguity about the rotation of the axis, which direction they go in fixing the origin, we also have to fix the orientation of the x,y,z axis theres a convention, right handed coordinate system, if you pick x and y, still need to decide is z pointing in the blackboard or out of it, we settle at right hand, x thumb, y inex finger, then z middle finger points out of the board towards us this is the right hand rule another convention, for distance we choose units 41:50 point is labled by x,y,z, thats also how we describe a particle 43:10 what is a vector has both length and direction, for example a position of a point, relative to it' origin, magnitude is the distance, and it has a direction don't think of a vector of being located anywhere 43:55 vector is the same, no matter where it is drawn in space, doesn't need to be drawn in space vector labled by bar on top, more precise a little arrow it could e.g. be velocity, it could be acceleration, it could be an electronic field it's got, length/magnitude, and it's gotndirection 47:55 (see formula) length equals square root the sum of squares of its components adding vectors, multiplying vectors by numbers 53:30 VectA+VectB=VectC VectA*VectB=AMagnit.*BMagnitude*cos(winkel feda) "the calculated dot product" the product of two vectors is not a vector, it's a number 1:00:00 we can display the dot product in component form VecA*VecB=Ax*Bx+Ay*By+Az*Bz, you can prove this with a little bit if trigonometry VectA*VectA=AMagnt.*AMagnit. 1:08:40 The velocity is the time derivative of the position Dot means derivative with respect to time (so this does not have to be writtenover and over again) Velocity is x of i dot (x1, x2, x3 for the coordinates) 1:13:50 acceleration is derivative of velocity or second derivative of xi, so it's written x with 2 dots X - position V - velocity a - acceleration r-Vector for radius, positiin vector 1:16:00 Formula of an object falling in gravitational field with constant acceleration, xt=a+bt+ct2 uniformly accelerated particle, that has acceleration 2c 1:18:00 Circular motion x+y achsis, the angle increases linearly feda=omega*t 2Pi/omega=period omega is the angular frequency X=cos(feda), y=sin(feda) derivatives of trigonometric functions velocityX=-omega*sin(omega)t angle between velocity and position? more on velocity, acceleration, calculated ways for this shown

[@seandafny]

U saved my life bro

[@CreativeVery]

Lol. It's "Theta" not "feda".

[@HERŞEYKÖTÜ]

Susskind dinleyen türkler var duygulandım :D

[@iahmmei1849]

holy ish dude i cant believe u took the time

[@yagmuraljaerhan9804]

Ayıp ettin

[@moralester]

711,000 people viewed this and learned at least a little bit in a very short time. It was a free class taught by an extremely educated man. Imagine the world we would live in if we had this kind of access to every class

[@gooddeeds9928]

Capitalist will loose their mind unfortunately education should be free for everyone

[@skankhunt85]

그냐

[@bobrericha]

I love this man. The way he explains things, the way he talks, the way he thinks, the way he moves, his wisdom. Having watched many of his lectures, I feel a deep friendship without ever having met him in person. Thank you so much, Lenny.

[@YasoHisham]

How are u doing now, 3 years later

[@mtmind6560]

@@YasoHisham They got married.

[@sisypheanexistence8955]

​@@mtmind6560a beautiful relationship blossomed after such hard Dick riding

[@math.physics]

I remember watching videos like these before college, which definitely kindled a passion for physics and math deep inside me. Then I also started reading advanced books, which were not even part of the course syllabus, for example the famous series of books published by Lifshitz and Landau. Among other things, I published the step-by-step solutions to many of the classical physics problems in the first book "Mechanics" in an online course on Udemy (called: "Multivariable Calculus and Classical Physics problems"), which deals with the mathematics and physics of rigid bodies, non-inertial systems, and much more. This is to say that videos like these can be very helpful in inspiring youngsters to appreciate physics.

[@mpay2874]

The Udemy course you mentioned is not showing up. Is that still available ?

[@math.physics]

@@mpay2874 Oh I see, now it has a different name, it's called "Multivariable Calculus and Classical Physics problems", I decided to merge two courses into a single one, due to the strong connection between the two. So, yes, it is still available.

[@aayushpandey6725]

I'm in final year of my high-school and I'm slowly starting to love physics. Thinking about studying physics in undergraduate. So, spending my time watching these lectures.

[@jcnotnot8120]

First 16 minutes is the most succinct and persuasive explanation for conservation of energy I’ve sat through. A lot of people tend to explain it through tautologies.

[@joabrosenberg2961]

Coin and dice configurations and laws of motion, conservation; infinite configuration space 22:00; non allowable laws, reversibility 26:00; vectors 37:30; particle position and motion and acceleration 1:05:30; 2 examples: motion on a line, circular motion 1:15:00;

[@Akshaygupta13]

49:05 Yes professor, your lectures are like the music that one want to hear over and over again. ❤️

[@halilibrahimcetin9448]

You are the definition of people who are awesome, Professor Leonard Susskind. LONG LIVE Leonard Susskind. We need you like how we need water to live.

[@BadAssBradders]

100%

[@Darkownage2]

Thanks Stanford. These lectures really get you interested into science and just the aspect of being in a university itself.

[@mileswetherington5628]

Native English speaker and I literally just learned the word 'retrodict' (opposite of predict) from Lenny. The perks of this class are boundless.

[@w花b]

Not a native speaker and I learned die and retrodict too

[@saikatislam1221]

hello brother

[@nandha0150]

Extremely thanks for providing such quality content for free of cost and enabling it to be accessible from everywhere. #LovefromIndia

[@ThePhysicsConnection]

Nandha Kumar yes this is one of the great things about our world today

[@of8155]

❤️

[@rationalsceptic7634]

One of the World's leading Physicists and Teachers, showing how to teach Science

[@ozdergekko]

Finally I found someone who is going to teach me the concepts in math I need to understand my big love, astrophysics, a little better. That it's such a famous physicist, the better. I'm somewhat proud I still remember and understand most of what he talked about in this lecture although I graduated from high school 38 years ago although I never really needed this since then.

[@tomstalley3179]

listen to startalk if you love astrophysics!

[@JRush374]

ozdergecko the Closer to Truth channel has a lot of good conversations about cosmology and astronomy stuff.

[@puspita282]

@@tomstalley3179 can you comment the link of the channel? or is he a person?

[@tomstalley3179]

Puspita Das just search ‘startalk’ kn KZbin, it’s Neil degrasse Tyson’s channel

[@GGyinyie]

Thank you stanford university for making this free to everyone, i decided to study physics however had (in germany) to decide between chemistry and physics as a school subject, i chose chemistry inorder to at least have some fundamental knowledge about it. Now i figured out that german university have their lectures uploaded however only on private servers which are unacessable to anyone whos not in their university. Thanks for giving me the chance to learn the basics to prepare for university

[@MrKinaidos]

Thank you Leonard and Stanford for this. The extras and insights mean a lot. You could lean this stuff from a Dover reprint, but learning it on a trajectory towards Scrodinger and company really helps one focus on what counts. I have been able to make quantum work for a long time, but I find myself returning to the roots over and over again to regain a sense of what I'm actually doing. I think lecture series like this are invaluable for contributing towards a future in which a significant subset of us understand what the world we can make claims about actually us.

[@aravindhvasu195]

For those, who are starting this course..... It's very slow and a bit dull, But it's THE best. He won't show you experiments and stuff , but all your common questions and misunderstanding will be addressed in this course. Really it's the best.

[@christophersoelistyo1905]

53:30 That little slip from his Quantum Mechanics lectures

[@lgcookie1933]

Christopher Soelistyo I know this is a super old comment but HAHA I saw that.

[@JLongTom]

46:00 When a world-leading theoretical physicist struggles to draw a vector in three dimensions, there's hope for us all.

[@ДаниельКрузе]

it's normal. My grandfather Ph.D in his 80 can't even draw a 2d vector lol

[@mmartin5816]

JLongTom Lenny in perfectly imperfect!

[@jeffrey8770]

Даниель Крузе (But u didnt say what area your grandfather specialised in, lol.

[@ruskodudesko9679]

not in art ^

[@ThePhysicsConnection]

JLongTom haha

[@afifakimih8823]

He is always extraordinary..he always find the simplest version of explaination!!if anyone don't understand him,he never understand physics.

[@DrDress]

I clicked classical mechanics and I'm watching graph theory. This is gonna be good!

[@WorldBurial]

I really like the book as a companion to these lectures. It gave me deeper insight in some physics concepts that I used to just "take for granted" otherwise. The exercises also help for that matter and I can't wait for a quantum mechanics sequel and the rest of the series.

[@ozzyfromspace]

[Paraphrased] "There are some things you only want to experience once, like a book. You don't want to read the same thing over and over again. But there are other things, like music, that you'll want to listen to continually because it just feels good. I hope my lectures are like that... (paraphrased)." Why yes, Professor Susskind, your lectures are a treasure to listen to. Stanford for the win. :)

[@ThePhysicsConnection]

These lectures have changed my life! Watching this feels nostalgic!

[@Red-bb6qj]

Just 10 minutes in, I already have a feeling I'd learn more once I finish watching this vid than 10 hours in class...

[@supern0is349]

jesus this is incredible it's like watching the hulk trying teach someone how to lift a 10lb dumbell

[@ryanyoon6772]

Super N0iS3 😂 lol bro

[@randomblueguy]

@Andrew Walter III Kaamo 'D La Simmetrie what the fuck

[@Joepage69]

@@ForeverStill_Fan1 and physics.

[@sadunfdo2888]

@@Joepage69 Don't use phone then. Be a Priest. Without Physics you are still trieng to use Pigeons as mail man.

[@Joepage69]

@@sadunfdo2888 physics is very much the unknown that was my point it changes all the time

[@neonblack211]

I've never seen a video on classical mechanics that quite starts like this, informative

[@darkerthanblackstudios2128]

I had lost my way and my love of physics due to depression. Decided to take a break from my astrophysics studies for a year. I think I will spend the year going through his lectures just to see if I can fall in love with physics again.

[@agrajyadav2951]

if u dont love physics, u literally dont want to understand reality, and that's like death

[@AT-27182]

49:09 Such a good analogy. And yes, Prof. Susskind, your lectures are like good music. Bravo maestro and thank you.

[@rickperez8975]

This was hilarious

[@Chillyman010]

This is invaluable, i love learning tho I cant afford to go to a big university

[@clairerogerson2153]

In

[@Adolfofficial9]

r u alive now

[@jolanmoussier9267]

Bad for you to not be french

[@tomassanchez6010]

You can apply for financial aid

[@vgdfgvv4381]

@@jolanmoussier9267 what?

[@n3r0z3r0]

Last 15 minutes, describing of circular motion, was awesome! Everything become clear!

[@netrapture]

at 19:03, the laws of evolution for die world are categorized by number and TYPE of cycles, e.g. there might be three cycles: one 1-cycle, one two-cycle and one 3-cycle, like his example but there could also be three 2-cycles, so it is more than just the number of cycles - as he hinted.

[@jayashreekuila2637]

This guy teaches classical mechanics in one class and can teach string theory in the other, hat's off to you

[@laurentd_YT]

1:06:15 : the r doesn't stand for radius. The official explanation is that the position of a single point in space can be defined by three different rotations defined in a rotational matrix. So the r stands for rotation

[@notagain3732]

Once again im glad to find a lecture from stanford to help me learn more

[@Anklusos]

Put it at 1.25 speed. Saved my life.

[@MrGoatflakes]

+Klanos 2x and 1.5x for me, but I had to go back to the stuff on dot product and proving the law of cosines cause I was playing Factorio and not paying attention. I love the speed feature of KZbin. I feel like I have been robbed of some of my life because I didn't discover it sooner xD

[@srirampard]

+Klanos You, my friend are a fucking genius and I would forever be in your debt!

[@hicham5770]

thank god i went down here before i saw the vid

[@landonazbill122]

Thank you so much!(:

[@exxel1701]

Great suggestion. Thanks.

[@Amazingyoutubechannnel]

Indeed your lectures are amazing everytime we hear them.

[@dve845]

1:23:33 Actually, the dot product being zero isn't enough information to draw the velocity vector. The sign of vx tells you what direction the perpendicular vector is pointing in.

[@abhinandanmalhotra8519]

This is the thing with top Institutions... They teach you 'how to think' rather than what to think.

[@_ospuds922]

"can anyone guess what my first picture will be?" to that poor guy "of course you can, you've been here before." 💀💀💀💀 Bro got roasted in front of the entire class by the damn professor 😭

[@spunts144]

Wow. That cleared up a lot for me. I'm looking forward to the next lecture.

[@subrotochatterjee5788]

13:55 The die could turn into any number of sequences, including REPETITIVE ones, for example.1,4, 5, 5,5, 5. The equation would change accordingly. So, is it deterministic?

[@xuhan1981v]

I think 5 may come from 4 and 5, so it is not deterministic.

[@friendlystonepeople]

Yes, but perhaps the world is full of people who do not have the same grasp or perspective. Plus, one can never over emphasize the basics. This is what separates great teachers from ordinary ones. I find that a lot of the students brush through the basics and find later that they do not have a deep understanding. The concepts of state/phase space are actually not as simple and are so critical in understanding a lot of the world, it is worth spending some time on. He is a great teacher!

[@warriordx5520]

All 'basic' scientific concepts took countless ph.d's and resesrch over 1000s of years. A simple idea like system's states can take more than a lifetime to understand. Very few people can grasp the true value and scale of fundamentals.

[@lgcookie1933]

Susskind: *show a group of people how to draw a simple 2-dimensional graph* Also Susskind: *Assumes that the same group of people can differentiate trigonometric functions*

[@sirius3333]

@@hiruki8 u didn't get the joke lol. Susskind tries to explain simple stuff and skips over relatively advanced stuff ( students know both) but just the way he is going on

[@alegzyi]

@@sirius3333 I think she just explained it further

[@redfire1508]

Could please activate in the video the option of automatic subtitles, that depends on the administrator, if they do not activate the other people does not get that option. Podrían por favor activar en el vídeo la opción de subtitulos automáticos, eso depende del administrador, si no lo activan a las otras personas no le sale esa opción.

[@nazishahmad1337]

53:25 That's what happens when you do Quantum mechanics alot

[@emonfromearth]

This made me laugh 😂

[@askhetan]

hahah!

[@gibson362]

Hey do u know what the general eqn was for the six-sided die? I cant figure it out

[@paxtonpoyiposida8901]

Ah my god

[@pinklady7184]

Which is easier, classical mechanics or quantum mechanics? I am only just today starting to study classical mechanics.

[@MANOJTIWARI-ni8jr]

Highly insightful lectures I ever came across, thank you sir for your work

[@milanvarghese]

According to this source, dice was once the plural of die, “but in modern standard English dice is both the singular and the plural: 'throw the dice' could mean a reference to either one or more than one dice.”

[@bilalnajjar903]

no one bothered correcting the professor 28:00 , it is ETETET... not ETTE... , i don't know why was he lost throughout the whole lecture. not hating, just saying.

[@anders5611]

He's 77 , was 71 in 2011

[@ghostape]

My brain lasted for 55 minutes. Started to watch bits again more to try and understand. Great lecture.

[@WorldBurial]

The book is called The theoretical minimum. Authors Susskind and Hrabovsky. The latter added some extra mathematics parts where needed. Electromagnetism is discussed, Hamiltonians, Poisson brackets etc.

[@Neomadra]

I have a question: Are there exercises (and solutions) that was made for this lecture? I really like Susskind's lectures but I think one can only learn, if you do exercises. So I'd really like to get access to exercises that fits to this lecture. If anybody can give me some hints, where to find such exercises, I'd be very grateful. :)

[@andrewnoonan5275]

Time in nature might not actually be the abstract of perceiving it as going back or forward to actual events but instead are actually the observable chronological movements of objects that are speeding up or slowing down "DEPENDING" on the level(amount) of gravity and perhaps G-force that's constricting or not constricting the atoms that gives the "OBSERVABLE CHRONOLOGICAL MOVEMENT" we all see around us

[@AbdulRaheem-f4c]

oh its unbelievable... Thank you so much to Standford and this gentle man

[@adinewsahilu5140]

I would like to thank the professor for his nice and interesting lecture he did!!!!!!!!!!!!

[@GregoryEvansRacing]

These videos are absolutely fantastic. Leonard Susskind is amazing!

[@MikeRoePhonicsMusic]

How I recommend watching these videos: 1 Get some notebook paper. 2 At the top of every sheet, write the KZbin video's web address, KZbin Channel & video name. 3 If Prof. Susskind writes it down, you should also write it. 4 Write a timestamp on the left side of your notes so you can easily get back to a given subject. 5 Pause when needed. 6 Re-watch a section if you're still unclear. 7 Go to Khan Academy if you need to brush up on, or learn new math concepts ( kzbin.info )

[@restitutororbis964]

MikeRoePhonicsMusic Thats exactly what I did, but with another youtube channel named Prof. Leonard, he teaches calc, great teacher btw. Ive filled 3 books worth of calculus, im at calculus 2 rn.

[@serenarife2344]

OneInfiniti MathBoi I watch Professor Leonard.

[@nitotech]

I agree Prof Superman (Leonard) is awesome!

[@andrewnoonan5275]

carrying on from lower post ,if a speed is constant then i'm intuitively confident that the G-force will remain and acceleration would "NOT" be a factor "IF THERE ARE NO OUTSIDE FORCES LIKE ATMOSPHERIC FRICTION"-An example would be the vacuum of space that would not require acceleration to continue the G-force effect once the optimum speed has been obtained- -So provided the atomic clock that slowed in the plane had continued motion(IN atmosphere that creates friction acceleration would be needed for constant speed "BUT" in vacuum of space "ACCELERATION WOULD "NOT" be needed for continued "PALPABLE/OBSERVABLE" G-force effect once the optimum speed is obtained) the atomic clock's movement of atoms "MIGHT ACTUALLY" be constricted by a miniscule G-force effect , thus slowing down the chronological movement of hands or digital face-Even light is affected by Gravity (as in gravity lensing) and i should imagine it's restriction would include anything observable by us-In the "MOVING" airplane cabin air and other unseen things may be the "OTHER" key factors interacting with motion to create the miniscule G-force effect that restricts the movement of atoms in atomic clock that creates the slowing down of it's actions as a clock-THIS might be the reason for time slowing down when movement is applied "OR" extreme gravity is applied and not the classical idea of the ability to go forward or back in time to see past or future events-THE black holes theoretically churning out constantly huge numbers of these gravity repeling particles and any matter with gravity to cause the expansion of the universe- "raw" Quantum particles which are in unusually small size repelling gravity and any matter with gravity(unlike the ones on earth )

[@JJ-db5fv]

Can someone help me on how to work out the simple equation in the beginning? I can't find anything online to help me work it out. I can only think using trial and error working up from 1-2, 2-3 etc. I have no idea how to start working out that equation and I know it should be easy.

[@nathankeenan9811]

Sneaky ket vector at 53:30

[@rasmusandersson7923]

Nathan Keenan Went down to the comments just to check if anyone else noticed :)

[@MT-vi6vb]

Oh I'm so glad others have noticed this.

[@monnsideol]

Leonardo,your lectures ARE music to our ears

[@dadesway]

Confused? Sloppy? Look at his lecture on 'Demystifying the Higgs Boson' - Of all the lectures this was the clearest overview of all of the great rash of such lectures that came out this year. I find the lectures leave me just enough to think about and sort out myself. I am a big fan.

[@MindAndLogic]

Well I am a high school student and I am glad that some great universities give a way knowledge for free. I love Walter Lewins Videos he is a great lecturer but they are limited to classical mechanic and electromagnetism. nothing complicated just freshmen's physics.

[@potugadu5160]

I have a question: I plan to watch all these lectures by Mr Susskind on classical mechanics, but will I get anything out of these lectures without an accompanying textbook? Thanks.

[@loctran9742]

+potugadu Yeah, I'm in the same situation and I've found something interesting here: ocw.mit.edu/courses/physics/8-09-classical-mechanics-iii-fall-2014/readings/ Hope that helps!

[@potugadu5160]

+loc tran Thanks. Honestly, I prefer not to read a textbook. I am neither looking to pursue a career in physics nor knowledge of physics required for my job; I am just curious about theoretical physics. So, I wanted to know if I can get by with just watching the lectures. I am willing to put pen to the paper, though. I did calculus based physics in high school & for a quarter in college long time back, and I consider my knowledge of physics & calculus still pretty good. BTW, lot of reviews of Landau & Lifshitz on Amazon state that it is not a beginner's book. A book by Georg Joos was recommended instead.

[@loctran9742]

+potugadu Totally right! Landau is horrible even for the ones who study physics =)), it rather be a doc for reviewing when you've already cover all the stuff, I think. If you want to dig (but not too deep) in the physics, Taylor's or Thornton & Marion's would also be a good option. Or you can wait until the Edx have this course. It's well-fitted to those who prefer self-study, especially to study without reading textbook. :)

[@potugadu5160]

loc tran Thanks for recommending Taylor's book. Read reviews that it is a perfect book for self study. An edx/online course on theoretical physic will be great for learning with some structure & discipline, and also to finish the learning/course in fixed amount of time. For me, any study/learning with no deadlines means never completing the study.

[@THEGREATONE420]

+potugadu the best accompanying to this playlist is Susskind's book "Theoretical Minimum: What You Need to Know to Start Physics. and for the playlist on Quantum Mechanics is his other book.

[@BonesTheRabbit]

At about 45:25, Leonard briefly mentions that a vector's magnitude is either positive or zero. But if it's zero, doesn't that preclude it from being a vector, as it no longer has a magnitude? Or is a magnitude of zero not the same as not having a magnitude? I'm torn, personally. Could go either way in my head.

[@fun2badult]

Yes, there is a zero vector where the length is 0. The zero vector does exist and lives within the vector space. Any vector dotted with a 0 vector is 0. It's like saying a number 0 isn't a number because by it being a 0, it doesn't exist. But we all know 0 is indeed a number and anything multiplied by a 0 is a 0. 0 vector has a component of 0 in all components, x,y, and z axis.

[@davidbennett3046]

Professor Susskind, thank you for these videos. Theoretical Minimum Classes suit me to a tee. I really like them.

[@ahmadrezakhazaie6305]

Will he talk about the Hamiltonian mechanics and Legendre transformation later in this course? I am looking for physics underlying Symplectic and Poisson Geometry would appreciate it if you introduce some materials to me.

[@ScalarSeeker]

I am willing to give half of my life, to get a teacher like Lenard Susskind.

[@carl14706]

The point of using modulo arithmetic is that you don't even need to assign value 6 on the dice to 0, because 0, 6, 12, etc. are considered the "same" element (they belong to same equivalency class).

[@comprehensiveboycomprehens8786]

I really feel like a turkey sandwich right now.

[@ThePhysicsConnection]

Comprehensiveboy Comprehensiveboy haha

[@levi83]

me too

[@pinklady7184]

While watching this video, I feel like eating a wrap with chicken, spices, lettuce, sauces, etc. Add chips (French fries).

[@lazyboi5726]

@@pinklady7184 Chips. Luvley

[@theunusual7631]

me too bud

[@angelapeterson1777]

So, you have to have 4 or more points in space to add a third direction other than forward and backwards. So 1, 2, and 3 points can only move forwards or backwards, 2 dimensional. The 4th, leads to inter dimensions?

[@yansayidiyegrace854]

Are You Physics Student at University? I recommend this: kzbin.info/www/bejne/noi3YWlvr85qo68

[@Tinydude10]

This is fantastic, thanks to Stanford and professor Susskind :)

[@derschmidtpunkt]

I feel my IQ rising by just listening to his voice. His lectures are amazing. Greetz from a german science channel :)

[@GustavoMartinez-tx5cr]

This is amazing. Big Thanks to Stanford and to L. Susskind.

[@rocksinmouth]

"Thinkwell". It's online lectures with a fantastic instructor. Not sure how much it is since my university uses it as a supplement to the class, but it is probably worth every penny. It has made calculus my easiest class. You'll be knocking derivatives out of the park in no time. Just google Thinkwell calculus.

[@kingarth0r]

I'm taking this class in the spring and I'm scared. I've been told as long as I can solve differential equations I'm good but I still think I'm going to struggle. Anyways I think that these videos are going to help a LOT.

[@thetheoreticalnerd7662]

Ummm, hello KingArthur...

[@thetheoreticalnerd7662]

It looks like we had the same idea...

[@unknownaspect-seba4749]

didn't know mike ermanthraut had the best classical mechanics lecture series on youtube

[@russianvillageboy]

"Mechanics is basically a set of rules about what those laws of motion look like" ❤️

[@pranshupandey4703]

Loved the lecture so much.

[@valtih1978]

Thanks for the download option. Pleas provide a link to playlist, eg. Classical Mechanics | Lecture 1

[@samarthsai9530]

Is it appropriate to follow the theoretical minimum book written by Prof. Leonard himself for completeness with these lectures

[@restitutororbis964]

Samarth Sai Lol Prof leonard? The one that taught calculus? Or am I wrong.

[@restitutororbis964]

Samarth Sai opps lol, just realized this prof's name is also leonard, check out prof leonard if you need to learn calc btw.

[@jamesmclaughlin8510]

1st of all. Thank you You are one of the greatest teachers I've ever come across. You love this Sh*t and it shows. I have one question. Do you mind showing me the equation of the simple rotating dice example. The one where 1 goes to 2 which goes to 3, etc... I apologize I am but a lowely plumber and electrician. I have been extremely interested in general relativity and quantum physics for over 30 years but the equations are over my head. Thank you

[@andrewnoonan5275]

i'm assuming that maths are used to describe the "non-observable"-the variable we cannot see to verify it's existence and state it's in-What i am asking is to allow the possibility that this concept below "might" have merit

[@dude157]

Good lecture. Helped me a lot. Just need to brush up on my calculus for derivatives of trigonometric functions.

[@ThePhysicsConnection]

Sam Smith if you know calculus and linear algebra the world of physics is more open to you

[@restitutororbis964]

The Physics Connection Differential equations and other advanced math such as complex analysis and topology make physics easier to understand.

[@juniorcastillo8418]

No tiene fuersas

[@juniorcastillo8418]

No tiene fuersas el motor

[@juniorcastillo8418]

Ke puedo ser pera mi troka

[@nurlatifahmohdnor8939]

Frankfurt is in Deutschland isn't it? Where is Twin Cities sir? I see in page vii of Editor's Preface to the First Edition. "...being built on Mississippi at Monticello, about forty miles upstream from the Twin Cities."

[@nurlatifahmohdnor8939]

"...with respect to enviromental pollution vis-a-vis fossil fuels - is made by Commissioner Ramey and Congressman Hosmer.

[@nurlatifahmohdnor8939]

1 A. Philip Bray 2 Stanley I. Auerbach 3 Arthur R. Tamplin 4 William A. Brungs 5 Joseph A. Lieberman 6 Ernest D. Harward 7 Charles L. Weaver 8 Merril Eisenbud 9 J. Newell Stannard 10 Harold P. Green 11 Craig Hosmer 12 S. David Freeman 13 M. King Hubbert 14 James T. Ramey 15 Barry Commoner

[@anhhuyalex123]

I think what he means is that some systems are different from others. Like you know, Euclidean geometry is different from Riemannian sphere geometry because it plays by different rules. So for example, the system of the coin (and only the coin), according to him, has only 1 rule. Nothing ever changes. However, in the system of the universe, we have many different rules, and that not everything stays the same.

[@kn0rkk]

I think the equation at 57:59 is wrong. |A| cos θ is a magnitude (in R) A_B is a vector (in R³) So they can not be equal right? I think he forgot to put absolut sign around |A_B| or am i missing something?

[@ΔημήτρηςΣωκόπουλος]

He is referring to A_B as the component of vector A along the axis of vector B, not as the vector projection of A on B. The component of vector A along the axis of vector B (=|A| cos θ) is a real number, on the other hand the vector projection of A on B is a vector (as the name suggests). Indeed, |A| cos θ is the magnitude of vector A_B. Also, in the beginning of the lecture he said that he might forget to put the arrow sign above vectors, so he might as well by mistake forgot to put the magnitude sign around A_B.

[@andrewnoonan5275]

is it true that in a g-force simulator if you keep it at a constant speed of say G4 the g-force will not apply??-My reason for this is what if time and space which einstein used to describe the slowing down of time could just simply be because the atoms within it's volume of space(space which could be the meaning of space as in time and space) are so compressed due to say g-force so that they are constricted more and more slowing down their chronological movement-What i heard was that an experiment of atomic clock ,each on a plane was synchronised and the "clock on plane that moved" slowed down compared to the stationary one-Would the forward force in physics of "for every positive action(forward motion) will create an equal and opposite reaction?? this might mean that the moving clock might experience a miniscule G-force or some other restrictive force ? If so then that constriction of miniscule G-force might constrict the volume of space for the atoms to move around in atomic clock slowing it down compared with the stationary clock?-If i heard correctly Einstein "predicted" that the closer you go to a black hole the slower time slows down-Wouldn't that be just a description of every atom that creates chronological movement is slowed down because even their atoms in molecules are "constricted" OF SPACE due to gravity and the G-force "forward" movement??-Imagine a person stuck in a very small closet that constricts his movements -To the observer it seems to show the slowing of chronological movement of his body to slow or even "STOP" -If atoms have a "CONSTRICTED/CONGEALED VOLUME" to move in then the movement of atoms will slow or "STOP"!! So the entire observable object would seem to slow and "STOP"!! --if a speed is constant then i'm intuitively confident that the G-force will remain and acceleration would "NOT" be a factor "IF THERE ARE NO OUTSIDE FORCES LIKE ATMOSPHERIC FRICTION"-An example would be the vacuum of space that would not require acceleration to continue the G-force effect once the optimum speed has been obtained- So provided the atomic clock that slowed in the plane had continued motion(IN atmosphere that creates friction acceleration would be needed for constant speed "BUT" in vacuum of space "ACCELERATION WOULD "NOT" be needed for continued "PALPABLE/OBSERVABLE" G-force effect once the optimum speed is obtained) the atomic clock's movement of atoms "MIGHT ACTUALLY" be constricted by a miniscule G-force effect , thus slowing down the chronological movement of hands or digital face-Even light is affected by Gravity (as in gravity lensing) and i should imagine it's restriction would include anything observable by us-In the "MOVING" airplane cabin air and other unseen things may be the "OTHER" key factors interacting with motion to create the miniscule G-force effect that restricts the movement of atoms in atomic clock that creates the slowing down of it's actions as a clock-THIS might be the reason for time slowing down when movement is applied "OR" extreme gravity is applied and not the classical idea of the ability to go forward or back in time to see past or future events-THE black holes theoretically churning out constantly huge numbers of these gravity repeling particles and any matter with gravity to cause the expansion of the universe "raw" Quantum particles which are in unusually small size repelling gravity and any matter with gravity(unlike the ones on earth

[@philipchen9367]

How are vectors and triangles connected ? or maybe i misunderstood. Why does the proof of cosine based on vectors , works in trigonometry as well ?

[@jaemecha]

He look like mike from breaking bad

[@digggert]

exactly what i thought :D

[@Mahmood42978]

AyoJeffy He IS Mike from Breaking Bad

[@Pantera1001]

nah he looks like mike from better call saul

[@peterreznikov6464]

Admit

[@Spractral]

Was thinking this watching season 5 of community today .. Sounds like him anyways

[@fractalres]

In a scaling coordinate frame, there are infinite causal webs; modeling systems in such frames demonstrates false causality by evident irreversible determinism. This makes aperiodic systems cyclical by placing them in a larger context. Irreversibility highlights cyclic emergence.

[@theunknownscientist3249]

Now, as I understand from both Leo's book and this lecture, the purpose of talking first about abstract systems, instead of just jumping into newton's laws, is that the abstraction shall apply in other themed lectures. For example, for statistical physics, the word system becomes very relevant. What I don't actually understand is what the definiton of a system is, or the degrees of freedom of it. Of course I have some intiition, but I'm looking for exactness here. Leo said in the beginning that a coin that can be heads or tails is a system, and it has only one degree of freedom since the state of it, depends on time. But we could also consider the position of the coin on the table. Would that be a different system? If so, how so? What has changed here? In my eyes, we changed just what we were interested in, the coin itself has not, so it shouldn't be a different system. And while the position of the coin could also depend on time, we add 2 more degrees of freedom: the state of the coin: if it's heads or tails, the x coordinate, and the y coordinate. So, if someone else has thought of the same thing, I'd like to hear some thoughts on the matter.

[@xuhan1981v]

If some quantity that we are interested in (e.g., energy) of the coin depends only on 'tail' and 'head' state, and does not depend on its position, then we can include head/tail only in the coin system.

[@maniacidus]

Mike from Breaking Bad

[@toplobster5374]

Now , I can't unsee😂

[@IAyala1010]

Put your pencil away Walt. I’m not having a lecture with you.

[@Optimumprime728]

@@IAyala1010💀💀☠️

[@oak963u7]

😂😂😂

[@tamimyousefi]

53:25 HAHAAHA best thing to write in classical mechanics.

[@stargirlhq]

In the three sided coin example, when he begins with edges, why does he go ETTE and not ETET? Why does it go to T twice?

[@TheDanEdwards]

This is a sloppier than normal lecture by Susskind.

[@shyamvijay8985]

It's a bit confusing that he uses dice and coins which are in the realm of probabilities to explain deterministic outcomes and states of a classical system

[@tomtucjr]

I'm 14. I don't understand everything, but this stuff is presented really easily and Prof. Susskind is great so I probably get at least 75% of this. Can't wait to go to university. ;)

[@Mayank-mf7xr]

tomtucjr are you happy now , 6 years later . are you in a university ? opted for STEM ?

[@lees3935]

Searching Amazon for dental pliers to pull my molars. Thought I grasped the concepts from Dr. Lewin. Going on to a different concept of grasp.

[@Charles-br5ub]

Imagine explaining physics in a simplified way thanks alot

[@thomascorbett2936]

In my opinion he's the most brilliant man in the world .

[@HamHamT]

Cringe

[@Photonlightt]

I mean, you can't lean such great towards him. We do have Michio Kaku, Brian Greene, Tyson, Penrose etc. ❤️

[@thomascorbett2936]

@@Photonlightt yes true .

[@kingjeremysircornwell7847]

Can you help me with my theory? That space is ghost partials. Matter that can no longer bind, adhere do to decay, loss of energy. Push=matter Pull=space/ ghost partials Sinsurly Jeremy P Cornwell

[@kingjeremysircornwell7847]

@Tom Burley I have dislixia and could use the help?

[@kingjeremysircornwell7847]

@Tom Burley I am