I am 15 years old and for years, I´ve been so interested in Physics, I am practically married to it. I know it is really hard, and I´ve had tough times understanding some subjects; but through videos, books, and online lessons I am understanding more and more everyday so I can understand the subjects better at college. My biggest dream is to understand the nature of Physics and everything to it to be able to work professionally at it! I try to study everyday and these videos help me out a lot. I write down what I learn and look at my own notes from time to time! This is so much fun! I wish I could be sitting in one of those classes right now! I love studying and learning!

This Guy needs a nobelprice for beeing one of the best teachers the world has ever Seen

wow it's incredibly generous of stanford to offer these to watch!! thank you sooo much!! bless you.

From 00:00 to 11:59 First he speaks about deterministic. He defined it in the following way: wherever you happen to be, you know exactly where to go next, so it's deterministic into the future. I.e. wherever you start, you know where you will be arbitrarily into the future and also you know where you were before. From 12:00 what kind of laws of physics do we not allow? Classical Mechanics forbids a system that has a deterministic from one direction and not from the other (e.g. possible from past to current but not from current to future). How do know if classical mechanics is allowable deterministic? Just check if each node has degree of income equal degree of outgoing. From 23:00 How much do you need of states to say what happen next? This brings us to continuous physics. Systems in classical mechanics are deterministic and reversible. Besides, systems could be infinite of chains of states or cycles. Conservation Law is just memory where we started. Information Conservation is the one that you never lose memory where you started. Information Conservation is perhaps the most fundamental law of basic classical physics. 32:42 1st order equation means it has only quantities of 1st deterministic with respect to time. 41:35 give a good example of Head and Tail. This video until this moment takes 1006472 views, so I expect that the second lecture would be half of this number of less? Why? I don't know but nature behave like exponential way. Let me check it now. EDIT: I just checked, it is 312134 views As I expected. I think the reason is people come to do the first step, but few who goes for the second step, and fewer who goes for the next step, etc.

When I first saw this video, I thought that the whole business of transitioning between states was a very simplistic and academic exercise. But when you get to the next quarter, Quantum Mechanics, physical objects can be in a superposition of multiple states, and this understanding turns out to be hugely useful. Lesson: Don't question Susskind :-D

Stanford lectures let me learn academic subjects while being stuck in Russia without any proper systemic education in existence. Thank you very much for recording and putting them, I wouldn't be able to learn certain things otherwise.

These video lectures should be required viewing for all Physics Teachers at all levels. I watched them when I was teaching Physics just to see if there were any pointers I could pick up to make my classes better. Now I just watch them for enjoyment.

Wonderful that we have such a course free and available to all. Thanks to Leonard Susskind and Stanford. Hoping to refresh my ailing Physics knowledge!

I'm gonna listen and study all of 136 lectures by professor Suskind. This is the first step I take. I hope this wonderful journey will take me to whole new level of understanding physics.

All to need to remember is a). classical mechanics allow unique paths to past and future. b). Information about the system is memoized so that integrity can be maintained e.g conservation of energy, momentum etc c). We need infinite amount of information in order to predict with great precision through out the time.

I remember me watching this at high school barely understanding anything and now since i started studying phisics in my country im so glad I know so much of what he's talking about

Perfect class . It goes deep into the soul of physics.

I just want to say that I am so grateful that these lecture series are made available. They are very very helpful.

Currently 13 and studying this to learn how I could make possible jet engines and understand fully how motion works. Very helpful of Stanford to record these lessons.

Thank you so much for posting this, o Stanford! This is true science for all. What wonderful spirit! And also very many thanks to Chaz Shand for taking the trouble to put them in order.

This has got to be one of the best lectures I have ever seen.

Thank you for this!! I am spending this year studying alone to get into university and these lectures are great!

Great lecture, I love how you explained it in such a simplistic way.

I cannot thank you enough. I cannot afford an education at Stanford (or any other great university or even not so great university) and the knowledge I am learning from Stanford/Leonard Susskind is one of the greatest learning experiences of my life and hopefully I can take this knowledge and change the world for the better .... at the very least it will make my world change exponentially with every lesson here.... THANK YOU SO MUCH !!!!!

This was a great Lecture, Dr Susskind. Thank you very much, it was very enjoyable and valuable. Finally a guy who just talks plain old fashioned sense and knows how to weave that in with the conventional physics syllabus. Take note other teachers/lecturers: Always know how to move from the general to the specific, from the big picture to the smaller picture, AND NOT THE OTHER WAY AROUND!!! This lecture is a good example of that. Very well done and enjoyable.

Thanks prof. Susskind for sharing your studies.

533,675 views for lecture 1, 37,220 views for lecture 9 which means about 7% make it through classical mechanics...

One of my favorite videos thank you for making this available sir.

Highly recommended, Prof. Susskind explains things very clearly. Definitely a higher level physics course. I took engineering physics years ago but the more abstract concepts (e.g., the Lagrangian and Hamiltonian formulations) were never developed. If you dare take these, bone up on basic calculus chain rule, integration by parts, and partial differentiation. Next, quantum mechanics (shiver me timbers). Oh, I saw his book in the public library looks like a good read, The Cosmic Landscape.

Thank-you for this series! It's fantastic.

thx for great and free lectures! Coming from computer engineering background you recognize state machines in the beginning of the video. Thats so awesome that science is interconnected. The more you learn about physics / chemisty / math / computer science the more you realize its fundamentaly the same laws and rules

This Prof.is amazing. He actualy teaches you to understand things better and esier!!

Thank you Lenny and Stanford for all these lectures.

If I can attend even a single class from prof, I will experience heaven . Hope I can experience heaven in this life.

This man is very intelligent, he puts it in simple terms, that even I can understand. I'm 18 and in high school, still at the time in my life where I never thought math would be interesting, but this is an exception to that rule.

Combined with his book of the same title, these lecs are a gold mine.

Serve para o que eu estava procurando por curiosidade. Obrigada, Stanford e Leonard. ^^

Cool ! i'm Vietnamese - i can't go abroad to learn - so that it's usefull. It help me have more experiences. Thank you so much !

Thanks , Stanford University.

thank you stanford for posting these lectures. God bless!

Thank you Leonard. You renewed my interest in the nature of reality and the universe. And trying to get to the bottom of what this "thing" we're in even is. Thank you, thank you, thank you

Hate to say it, but these lectures are FAR, FAR better than the ones that I received at my uni. There, all my profs did were to throw a bunch of DiffyQ's, formulas and proofs on the board, and rarely ever explain, or LECTURE, as to what they meant or why they were useful. Despite the fact that I have a BS in Physics, watching Dr. Susskind's vids tells me just what I missed. What a great teacher will do for a subject, he's filling in so many holes in my knowledge...

I love these videos. Once you start watching it you can hardly stop, anything discovered is much greater than the time wasted on playing games or watching other junks.

I'm currently 12, and I have always loved physics. When I saw lectures by Leonard Susskind, I jumped at the chance, since I'm reading a very interesting book by him. It's called "The Black Hole War" if anyone's interested. I highly recommend it.

Susskind is the best at explaining. Period.

His approach to CM is really unique and impressive.

to reiterate the vacuum is expanding because mass wants to expand but can't so the vacuum itself does it for us pushing all that energy directly back at us. To say the force of the world that's pushing on the vacuum is literally throwing itself on every piece of matter within a planet's system.

Hey, this is not a bad place to start - with Leonard Susskind's lectures, but I have just finished - at nearly 30 years old - studying IGCSE's in Maths and Physics. I was worried that after well over a decade out of school that I would struggle, but that level - GCSE - is the perfect level to start and get the very basis of Classical physics. Also, the maths is just as important to understanding it all. Hope that helps.

Thanks so much for making these great resources open

interesting, never knew about that, now that I'm taking studying physics more seriously than before I realized that I knew so little before. ill still be studying more about this, ill watch all the videos and take notes

I viewed one of Prof Susskind's lecture in which he stated that all physics depends on a change of energy. My hs physics teacher said the same thing way back. When I study physics now, I keep this in mind whenever we study any concept....

The vacuum of space is rising the external kinetic energy of earth while in the system we are dragging our own potential energy down by having complexity to the system while at the force of which the vacuum expands is at which the planets want push back at the vacuum around but find no circuit for physical matter in thus finding reasoning for gravity itself.

Thank you for uploading this content. It's great

How amazing it is to find physics lectures for free!!! I get to learn something new in my free times :)

strongly suggest you watch all these lectures at 1.5 speed! :)

The lecture gives a detailed understanding of the basic axioms of classical mechanics, why do we have two dimensions in phase space and that too position and velocity only. Very interesting and helpful for those who want a grasp in the field

This Prof. is amazing! He actualy teaches you to understand things better and esier. :D

Wow, some of those concepts (especially during questioning) went completely over my head... Damn.

very good explanation of classical mechanics which comparises mainly of nutonian mechanics i loved the vedio.

You can't see the damn power point slides in this class. This is good!

Nice lecture as an explanation of the need of the phase space and deterministic bases of classical mechanics. One can say that In classical electrodynamics when a charged particle moves with acceleration it radiates energy and semiclassical force is related to the first time derivative of acceleration. So from lecture arguments the phase space in that case should contain also acceleration ...

Interesting , thanks prof. Susskind.

If you put nothing into something the matter's potential energy converts into kinetic energy. If you put something into nothing the matter's potential energy actually rises. If you put matter into matter the matters potential energy lowers.

Thanks for sharing the lecture.

I love this video. Have you considered teaching the number of observations needed with lines of psedocode, something like 'if state_n = a, state_n+1 = a', I find it easier to think of it that way instead of the arrow diagrams, but maybe that's just me.

This guy rules. A true physicist,

Great lecture, thanks for posting this.

There are a lot of interesting concepts just in this first lecture

knowledge is something that should be seen as an opportunity it is so sad that many ppl have the opportunity to learn all they need just by looking everything up online but instead they waste their time on petty things and never try learning just for the fun of it.... back 100 or so years ago videos being free like this would be like finding gold

Excellent presentation of compressed concepts

Wonderful teacher. Although I keep thinking about how Mr. Susskind has the face of George Carlin, and the voice of Christopher Walken. I will continue to watch the videos.

"Leave Sauron to me!" - Leonard Susskind

14:46 Susskind: "Why are they forbidden by the principles of classical mechanics?" Someone interrupts him and we never get to hear this question answered.

Great lecture Prof. Thanks.

The mass of the earth can be measured indirectly. There is an equation for g that involves the mass of the earth so the problem of determining the mass of the earth comes down to measuring G and g accurately.

A simple point about predictability versus deterministic: In chaotic systems small uncertainties about the starting state amount to big differences between prediction and what actually happens quite fast, so that after a short time, predictions are not useful any more.

This is great! 🙌🏽 Thank you very much.

The heads and tails part has a great bijection with binary functions The final law was just a xnor gate of sorts

i love the lectures!!!

As I embark on the series, I would like to say that I have already seen some of Dr. Susskind's videos and read his books intended for lay audiences. I appreciate so much that he has kindly taken the time to create this information, and furthermore make it so easy to understand, and be so enjoyable. This is not a small thing.

the equation describes an energy mass duality, it is not a vector or in other words an equation that you can apply a variable of time in it to figure out it's direction, the equation may apply to all matter

I completely agree..this is like finding Salomon's Book of Wisdom

Wonderful! Thank you!

A million thanks!

Thanks for putting this up. Would love to study a physics degree but space-time...ahem...i mean, money-time continuum doesn't allow for this at the moment. It's a brilliant second best option being able to watch these videos!

man this is cool they decided to put these on the internet. That would be cool if Harvard put their physics lectures up.

God bless YOU !!!

yeah.. i'm from malaysia and i can't go abroad either.. youtube rocks in this sense..

"Conservation laws" seem to be based on determinism (classical mechanics), in that unless there is "random" in the system (could be either as each is free from strict causation) then the past (and future) must be predictable.

The questions and comments aren't stupid, One must recognize that it is those students paying tuition that funds this professor in the first place. It is unfortunate that a microphone was not present in the student body to allow everyone equal volume and presence in the video.

Acceleration is a change in velocity, meaning that there is a change in energy. Only with a change in energy do we have a physical change. If we have no change in energy, then we can accurately predict where the mass will be in a given time. That's what he means, we don't need acceleration to know where that particle will be, mainly because acceleration doesn't exist until an outside energy source comes in and messes up the initial state, causing acceleration....

The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics by Leonard Susskind is a good book to read to get some background on the lecturer. He mostly studies general relativity, concepts in quantum gravity, and formulation of relativistic problems in string theory like black holes. In the book, he tells like his background, life story in relation to several physicist including Hawking, and his theoretical contribution to black hole theory.

I think the Very last sentence about third derivative equations is very important. I really think that is the future of physics.

@acr08807 "to begin" is a concept which alone makes sense without time. However, beginning is something that doesn't make sense unless it is framed by time. Began, begin, will begin all have no meaning without time, so with there ever being an instance without time nothing would be able to do anything, including begin. To put it simply, verbs happen in time.

This is physics in 2-D when referring to a 50/50 possibility. You just added area, lots of crazy calculations come into play then. Calc 2 and Phys Chem will let you answer that.

@tonymajjc 1) whether the bullet kept going would depend on how fast the bullet was going. 2&3) the moon still has gravity, it just has less of it than the earth does. so the bullet would act the same way as it does on the earth, only it wouldn't need to go nearly as quickly to escape the moon's gravity, due to the fact that the moon has almost no atmosphere (less atmosphere means less friction) and less gravity than the earth.

thank you for this videos

The expression of despair in his face with the dumb questions they make..

Awesome! Glad I found this :)

@tonymajjc Air causes that friction. Like wind, there is actually a density that is very observable, gravity pulls (like a universal magnet: gravity). (But please, try using Capitals, comma's and (.) like when you talk. You can't hold enough air to say all that without stopping. ;) )

@absolutemes spot on bro.

you should also do problems from books. With these videos and feynman lectures and textbooks, you can be just as good as anyone, just minus the research experience which some BA's in physics don't do anyway. Well actually there are some laboratory courses in experimental physics you'd be missing out on as well

i love this guy!

good lecture and has given lot of insight what the criteria for to be called as law allowable in classical mechanics ? Important of position and velocity pair in understanding motion ? Thank you very much sir for giving this awesome lecture

I downloaded this Thank you.