can you please answer this as if im 10yr old if u shot a bullet from gun on moon (1)would the bullet keep going or (2) drop down vertically after it ran out of steam or (3) just act the same way as on Earth Thank you and no im not a Scientist
@tonymajjc the bullet wouldnt fire because guns need oxygen too fire. but theoretically if a bullet was fired it would continue moving forever because there is no friction in space.
@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. ;) )
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.
If you were able to fire a bullet on the moon, it would act almost the same as a bullet on earth. Things don't 'run out of steam', if it's moving then it'll move forever. The thing that makes bullets stop is when gravity pulls them down. The bullet will accelerate to the moon and stop when it hits the surface. I can produce the maths too if you'd like.
Why does he always say you need position and velocity to determine all positions of a particle into the future? don't you also need the acceleration (or the forces acting on the particle)?
i have created a cycle with the help the Dr.Susskind example first he said H H--->H HT----->H TH----->T TT----->T H^H^H which is HH H^T^H which is TH T^H^T which is HT T^T^T which is TT if HH starts it goes to HH no velocity is required cause it stay at rest if HT starts it goes to TH +(positive) velocity is required cause it changes its position if TH starts it goes to HT -(negative) velocity is required if TT starts it goes to TT on velocity again it it rest
I'm not sure what Physics 1 & 2 is, but I could probably help you
This is the framework of analytical mechanics, and depending on the institution, is typically a 200 or 300 level course.
I would think Dr. Susskind would teach mainly graduate students, and based on some of the topics within the lecture, it seems that this is an advanced graduate course on some of the fundamental axioms of physics under the framework of mechanics. He is speaking about interpretation here, not basics
Hey I am trying to self teach myself the principles of basic physics before start of second term. As we are going to start Geophysics. I have no background of high level Maths nor physics and have interest. I would like to ask of your help as to would this video help me or do I need a more subtle approach?
I wouldn't say it was an ego game on my part, it was never about my ego, it was always done in a jesting way, so perhaps "berate" was the wrong word to use.
The frustrating part of having these "irrelevant" questions asked is that they must usually be answered regardless, because some students merely hearing them would require the answer or else be further distracted, so simply saying "I'll answer that outside" would leave it lingering in the minds of the "bystanding" students.
He's a certified genius. These proud clowns insist on trying to appear intelligent by asking the silliest questions and fail miserably each time. It's a privilege to be taught by Susskind. You are not supposed to try and outwit the man in mechanics 101.
@JLXOutlaw JLX, knowledge is cumulative. This course requires a good working knowledge of calculus and first-year college physics. If you were to study group theory first, then everything in this lecture would be simple for you. If you're really interested, don't give up. If you have questions, PM me and I'll help you.
@acr08807 My background in any sort of mathematics is limited, so that makes sense.
I was hoping the ideas would be a bit more abstract, but I see they follow some very precise laws, that I don't have the tools for understanding just yet.
Thank you for the offer.
I would PM you, but It would only be a waste of your time, since the majority of my questions would be directed to the math, not what is being taught in the video.
@JLXOutlaw If you're interested, MIT has excellent lectures on single variable calculus, introductory physics, multivariable calculus, linear algebra, and differential equations. If you complete those, you'll be well prepared for Susskind's full lecture series.
I understood the first four lectures of MIT's classical mechanics ,however i'am having trouble with this.Should i continue with that or is there any easy way to understand this?
Please Reply Guys.Please I'am Badly need some advice.
does anyone know where you can get the problem sets for this course? I found the midterm and final, but not the homework sets...Just trying to brush up..
An actual STARGATE/PORTAL-THING was captured on film. The footage can be found within the short-film entitled "SUDDEN PORTHOLE", which is currently parked at the PROJECT CAMELOT YouTube page (it's under the George Noory video).
I'm not selling anything...I'm just trying to spread the word about the unseen-dimensions we find ourselves embedded in.
My BLOG contains the peripheral data regarding the movie and is where I reply to the "debunkers" (use search words "Sam Zurick" & "BLOG"). THANKS!!
@roniepao as if you'll watch the rest.... the reason why this is legal first of all is because most people don't follow through with it notice how for lecture 2 the views exponentially drop. 2nd you can't get a degree from youtube.
oh i get it... nevermind. hes just doing the difference in the force over time = mv right? and since he has that differnce in f it give him a difference of the velocity thus acceleration. right?
29:30 you want to be able to predict what is going to happen in any given interval in a room full of people? good luck :P I suspect that this guys thinking is sort of deterministic, but i can bet you that one person lifts his hands, and the prediction of where all molecules in a class room is going to be, is going to be wrong. but that is beside the point i know.
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.
@monsterhunter99 Anything without time would be equally timeless. It can not be 'before' or 'after'. It can only exist as imaginary numbers exist on the number line. We can claim ignorance, but there is no reason to act against logic or the principles 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.
I would say the statement time evolves continously is paradoxical, because there are intervals within time which are also continual. The same way that inbetween 1 and 2 it would be possible to place an infinite amount of decimal numbers in an infinite amount of variety and no matter what is put there is always a midpoint inbetween the next 'pulse' and the previous, 0 to 1 is .5 as an example and it can be divided by two infinitely, also 1.11 inbetween each 1 is an imaginery distance/interval.
@PLecN yeah I know :d we assign deterministic rules in order to create contants that we use as a foundation for other mechanics.... but in our realm there will always be random bell curves... But back on topic, I could even place "there will always be random bell curves" as some kind of determined law because 'always' would place the rule and it would be continually random as to where there will be a bell curve. So in a sense it does evolve continuously but also at the same time it does not.
@pawnshopr Yes, that's why my nose never touches the wall when when I walk across the room dividing each subsequent space in half; plus, I'm still waiting for Achilles to catch that Tortoise!
i love how nearly every statement he makes, he follows it with another statement clarifying/descrbing something he said in the previous statement. so 20 thoughts later you finally undestand what he meant 20 thoughts ago lol
Great lecture but i feel kind of bad for the guy; the questions asked by the students just seemed really nitpicky and not really having to do with the concepts susskind was presenting. Maybe it's just me.
Great lecture (series) all in all. It still blows me away that resources like this are so freely available nowadays.
Its not just you, its the one thing I miss least about college, both being a student and a teacher, and that one thing is when students ask distracting and inconsequential questions that say "to-MAY-to" when the professor says "to-MAH-to", many times (presumably) to hear their own voices. Its very, very annoying, and the one tiny island of satisfaction I found when dealing with it was to berate the students that did so in my classroom.
@PazGuerro that makes you a dick. students should have an environment where they can ask questions. have you forgot why you were employed and paid. you sound like an employers worst nightmare, a workshy and self indulgent tosser on someone elses dollar.
Perhaps I am a dick, but I received positive comments from all of my students, and one of the biggest compliments to me was that I made learning "comfortable".
Students should ABSOLUTELY ask questions, but one thing they should NEVER do is disrupt, interrupt, or distract other students, and when you ask questions that do not apply to the topic on hand, or that merely satisfy your own ego, you are a distraction to my other students and to the lecture.
@PazGuerro They said "bifurcate" because they didn't know the word "subgroup," and they clearly didn't understand what Susskind was driving at. If your idea of dealing with questions from people who didn't get it was to berate them, forget being a bad teacher, you're just an asshole.
Actually, I clearly stated that it came only to students who were regular distractions to other students by asking questions more appropriate during office hours. Grasping the concepts I presented was of course priority number one for me.
And yes, I am an asshole, but I still received very positive reviews from my students, so perhaps I am merely misrepresenting what actually went on in my classroom?
Regardless, some students speak to hear their own voices. Agreed?
@PazGuerro You can also speak with students outside class instead of berating them. Berating isn't education, it's playing an ego game, just like talking to hear your own voice is.
@AleifrLeifrson We consider the underlying idea behind this lecture, symmetry groups. It's hard to give a simple description, but every conservation law is linked to a symmetry (something that doesn't change) in physical law (for example, conservation of energy is a consequence of physical laws being the same at all times).
@AleifrLeifrson Everything that Susskind says between defining a state and discussing the relationship between dimension of a state space and the order of the differential equations of physical laws can be summarized in one sentence: States form a group under physical law. Since he doesn't assume that his students know group theory, he has to take more time to explain. Group theory (including its branch, representation theory) is one of the most useful tools in theoretical physics today.
Someone explain this? If you have a rule saying H > H and T > T. That's a totally acceptable rule according to the video.
How does it come then, that when you add information the rule becomes invalid and non regressable. Namely by creating the sets HH>H, TH >H, TT>T and HT > T.
In this rule the previous rule is still valid, yet as a whole it becomes invalid. Does this mean that if I find the second 'pattern', I should dismiss it and go for the more simplified previous rule? Seems strange.
@Rantoro You can always write down a rule that sends a two-bit state to a single-bit state like the one you mention (HH -> H etc) but it won't be a valid 'law of physics' because a valid law must send two-bit states to two-bit states even to be considered.
@PLecN Makes sense to dismiss the example I gave as invalid rule as whole. Does seem odd that a trivial change in the premise, 2bit to 1bit wouldn't be an option in science :D I guess that's why there are rules hehe :)
@Rantoro It will become more obvious later in the course that this is a technical requirement.
In order to describe the state of a particle say, you need two bits of info - position and momentum at a given instant. If u know the state now and want to predict the future state, u need to plug two bits into a 'rule' and get two bits out. If only one bit comes out - position say - then u can't predict the state, since state means both position *and* momentum. (I think that makes sense !!)
@Rantoro in classical mechanics we have strict determinism. That is given a state and the laws you should be able to find out previous state(or future state).
In the rule you describe HH and TH both evolve to H. So in case you are given H you can't find whether it came from HH or TH. Thus the system you described isn't deterministic. However in a system which has the law H>H and T>T , we can find out past/future state given present state.
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....
Hmm the concepts here seem quite advanced to me. I self taught myself up to vector calculus so I understand pretty much all the maths here, but I'm having troubling following the concepts at this abstract level. Perhaps one or two more specific examples throughout the course would have helped me greatly.
With respect to the level of depth are these courses on par with undergraduate education in physics? I'm talking about all of Professor's Susskind's lectures up to String Theory.
Pretty much no level. These lectures are interesting, but they aren't really up to par with academic courseloads, especially without the "work" and tests one would normally have to do. These lectures are more like what light-reading/(reading for fun) is to actually putting work and study into a textbook. Not saying that the content is trivial, it's just that this isn't how school is like.
I loved this, thank you! Why spend a fortune in university when you can just learn this stuff for free on youtube, learn what you're good at beforehand so when you do get a degree you not only know what you'll enjoy or be good at in university but be knowledgeable enough through online lectures to score well at the end.
It was embarassing though when the douche in the audience kept interrupting though, I imagined the professor saying "If you don't shut up I'll give you cement shoes asshole!"
@sgsawant . Yes this lecture series is complete. It is part of a Stanford series - Modern Physics:A theoretical minimum. Please visit the wikipedia article of Leonard Susskind. There in a section called lectures, the order in which the lectures were broadcast are given. Apparently there is some goofup in the lecture titles. As the lectures on quantum entanglements also cover special relativity . :)
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.
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.
@YouGoByeBye Its an unfortunate thing... In schools it seems math teachers are certainly interesting in explaining HOW to do math... but simply not interested in explaining it in a form that creates a picture in the students mind of what the hell is going on.
Nobody can be seriously asked to hold abstract rules in their head without being shown what is going on. Later on they can see that picture in the math...but at the outset there is no frame of reference.
@MumblingMickey This is a physics class in which theory is more important than the mathematics behind it. The students are expected to understand the math already given that there is a prerequisite for the course. Physics by nature is applied mathematics.
This comment has received too many negative votesshow
sir, i don know what happened to you, but you are so full of anger, fear and guilt, it comes off the first sec... maybe its someone, maybe its the catholic church that instilled this much fear on you...
despite of your knowledge, i repeatedly tried to listen to you, but watching this i got the urge to hide under my desk..
listening to you is a real torture
thanks for trying though, maybe you should introduce eastern phylosophy in your life or just go on a holiday to rehab for t rest of ur life
@JmSantos78 from what i got ( witch isn't much) all he is saying is that nothing is just guna switch it self in to anything else. gold can't become lead. ...... i think
@joeglimmix it is actually a very common example, in statistics for example, because both have very limited possible events and are thus easy to examine. Im only at 3 minutes by now but just felt like i'd leave the comment right now...
So get to the point - you hang on the same thing for too long. Laboring the point too much.
robkins7727 1 day ago in playlist Course | Modern Physics: Classical Mechanics
relevant to my statistical thermodynamics course :P
great lecture !
sarkytboy 2 days ago
why do the students have to ruin the lecture with there stupid questions
tuoice 1 week ago
can you please answer this as if im 10yr old if u shot a bullet from gun on moon (1)would the bullet keep going or (2) drop down vertically after it ran out of steam or (3) just act the same way as on Earth Thank you and no im not a Scientist
tonymajjc 2 weeks ago
@tonymajjc the bullet wouldnt fire because guns need oxygen too fire. but theoretically if a bullet was fired it would continue moving forever because there is no friction in space.
tuoice 1 week ago
@tuoice
If the bullet was able to fire on the moon, it wouldn't keep moving forever, it would fall. Friction has little to nothing to do with it.
dudejohnny 2 days ago
@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. ;) )
Lordradost 1 week ago
@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.
projectbeard 5 days ago in playlist Course | Modern Physics: Classical Mechanics
@tonymajjc
If you were able to fire a bullet on the moon, it would act almost the same as a bullet on earth. Things don't 'run out of steam', if it's moving then it'll move forever. The thing that makes bullets stop is when gravity pulls them down. The bullet will accelerate to the moon and stop when it hits the surface. I can produce the maths too if you'd like.
dudejohnny 2 days ago
Why does he always say you need position and velocity to determine all positions of a particle into the future? don't you also need the acceleration (or the forces acting on the particle)?
mushigoya 2 weeks ago in playlist Course | Modern Physics: Classical Mechanics
@mushigoya By knowing the position of all particles, you know the forces acting on the particles
jarvisloh 1 week ago
I'm 16 :)
jesseortiz666x 2 weeks ago
@jesseortiz666x And? I'm 14.
vinigretzky97 2 weeks ago in playlist Course | Modern Physics: Classical Mechanics
@vinigretzky97 And?
JesterGren 2 weeks ago
@JesterGren or
vinigretzky97 2 weeks ago
@jesseortiz666x I am 15.....
Canadianloyalist123 5 days ago
those students who have to ask stupid questions to show how smart they are ruin the video
0GBrooklyn 3 weeks ago 3
i cant able to understand last 10 of the class
they have created a cycle which is quit confusing
i have created a cycle with the help the Dr.Susskind example
CRHAVOC09 3 weeks ago in playlist Course | Modern Physics: Classical Mechanics
CRHAVOC09 3 weeks ago in playlist Course | Modern Physics: Classical Mechanics
Comment removed
CRHAVOC09 3 weeks ago in playlist Course | Modern Physics: Classical Mechanics
This has been flagged as spam show
@CRHAVOC09 i dont know the given above law of mine is correct r wrong pls if any one know it advice me.
CRHAVOC09 3 weeks ago in playlist Course | Modern Physics: Classical Mechanics
I think the Very last sentence about third derivative equations is very important. I really think that is the future of physics.
ohmysausages 4 weeks ago
Is this the first lecture for a college physics 1 course? I'm going to take Physics 1 & 2 next year, so I want to do a little review.
dodgerguy1981 1 month ago
@dodgerguy1981
I'm not sure what Physics 1 & 2 is, but I could probably help you
This is the framework of analytical mechanics, and depending on the institution, is typically a 200 or 300 level course.
I would think Dr. Susskind would teach mainly graduate students, and based on some of the topics within the lecture, it seems that this is an advanced graduate course on some of the fundamental axioms of physics under the framework of mechanics. He is speaking about interpretation here, not basics
derpaprikalyoner 1 month ago
@dodgerguy1981 This is a continuing education course, not a regular college course.
MrRobotoToo 2 weeks ago in playlist Theoretical Physics for Dummies
i just came here to see what nerds are up to these days xD
jasonvorhees24 1 month ago
In the last Law bit the correct sequence was HH toH, HT to H, TH to T, and then TT to T
lawanbrown16 1 month ago
Hey I am trying to self teach myself the principles of basic physics before start of second term. As we are going to start Geophysics. I have no background of high level Maths nor physics and have interest. I would like to ask of your help as to would this video help me or do I need a more subtle approach?
GeologicalDiplomat 1 month ago
I wouldn't say it was an ego game on my part, it was never about my ego, it was always done in a jesting way, so perhaps "berate" was the wrong word to use.
The frustrating part of having these "irrelevant" questions asked is that they must usually be answered regardless, because some students merely hearing them would require the answer or else be further distracted, so simply saying "I'll answer that outside" would leave it lingering in the minds of the "bystanding" students.
PazGuerro 1 month ago
He's a certified genius. These proud clowns insist on trying to appear intelligent by asking the silliest questions and fail miserably each time. It's a privilege to be taught by Susskind. You are not supposed to try and outwit the man in mechanics 101.
commentOshimasu 1 month ago
@commentOshimasu I thought Susskind was a genius, too, until he jumped on the multiverse bandwagon.
acr08807 1 month ago
Wow, some of those concepts (especially during questioning) went completely over my head...
Damn.
JLXOutlaw 1 month ago
@JLXOutlaw JLX, knowledge is cumulative. This course requires a good working knowledge of calculus and first-year college physics. If you were to study group theory first, then everything in this lecture would be simple for you. If you're really interested, don't give up. If you have questions, PM me and I'll help you.
acr08807 1 month ago
Comment removed
JLXOutlaw 1 month ago
This has been flagged as spam show
@acr08807 My background in any sort of mathematics is limited, so that makes sense.
I was hoping the ideas would be a bit more abstract, but I see they follow some very precise laws, that I don't have the tools for understanding just yet.
Thank you for the offer.
I would PM you, but It would only be a waste of your time, since the majority of my questions would be directed to the math, not what is being taught in the video.
Thanks though ACR. =-)
JLXOutlaw 1 month ago
@JLXOutlaw If you're interested, MIT has excellent lectures on single variable calculus, introductory physics, multivariable calculus, linear algebra, and differential equations. If you complete those, you'll be well prepared for Susskind's full lecture series.
acr08807 1 month ago
yawn..
rrthedoctor 2 months ago
the students are annoying as hell... it would be nice if they could just shut up.
OoTFanboy 2 months ago in playlist Course | Modern Physics: Classical Mechanics
thank you for putting these on here stanford, sharing is caring, would love to have all of your classes to understand more, thank you!
boogiebuddy01 2 months ago
aaaah i recognize this guy he did a talk on TED :P
Ytubeisonline 2 months ago
@Ytubeisonline
I had it the other way, I recognized him on TED. Because I watched his lectures! :D
Jipzorowns 1 month ago
9:46 666
Zoasterboy 2 months ago
I understood the first four lectures of MIT's classical mechanics ,however i'am having trouble with this.Should i continue with that or is there any easy way to understand this?
Please Reply Guys.Please I'am Badly need some advice.
treeandplant 2 months ago
@treeandplant I'll help. What is your background in math and physics?
acr08807 1 month ago
@acr08807 Thank you so much for the response.I'am planning to learn from the beginning.I was stuck with my personal problems all these days.
treeandplant 1 month ago
Classical mechanics is where it's at.
dapdaddy10 2 months ago in playlist Course | Modern Physics: Classical Mechanics
does anyone know where you can get the problem sets for this course? I found the midterm and final, but not the homework sets...Just trying to brush up..
BrigidFarrell 2 months ago
buy a HD-Cam !!!!
Sica1000 2 months ago in playlist Course | Modern Physics: Classical Mechanics 4
This has been flagged as spam show
An actual STARGATE/PORTAL-THING was captured on film. The footage can be found within the short-film entitled "SUDDEN PORTHOLE", which is currently parked at the PROJECT CAMELOT YouTube page (it's under the George Noory video).
I'm not selling anything...I'm just trying to spread the word about the unseen-dimensions we find ourselves embedded in.
My BLOG contains the peripheral data regarding the movie and is where I reply to the "debunkers" (use search words "Sam Zurick" & "BLOG"). THANKS!!
peopledick 3 months ago
Great lecture, I love how you explained it in such a simplistic way.
justmeduhfull 3 months ago 15
This has been flagged as spam show
Love people who can make difficult concepts so easy. I loved this website also
visual-ink.in
VisualEase 3 months ago
omggg :D
iphonekidsgames007 3 months ago in playlist Course | Modern Physics: Classical Mechanics
i just finished the 1 minute part of this video. i will watch this again after i finished playing games. heheh
playing first before study. thats the beauty of Youtube University.
roniepao 3 months ago
@roniepao as if you'll watch the rest.... the reason why this is legal first of all is because most people don't follow through with it notice how for lecture 2 the views exponentially drop. 2nd you can't get a degree from youtube.
StimPakTskAwwYea 2 months ago
Youtube University is the best.
roniepao 3 months ago 32
why are all the tards interrupting him with all these stupid questions? let the genius speak. love it when he answers one whiners question with "ok".
rolgorevene 3 months ago 8
хули на английском? по-русски давай!
20218381 3 months ago in playlist Course | Modern Physics: Classical Mechanics
@20218381 I love mat.
acr08807 1 month ago
wtf was with the question at 15:40...class dummy
omnicronvegas 3 months ago in playlist Course | Modern Physics: Classical Mechanics
Back in the day: you were lucky if you could read.
Modern day: free Stanford classes.
tuillin 3 months ago in playlist Course | Modern Physics: Classical Mechanics 8
This is intresting.
Agrashsallam 3 months ago in playlist Course | Modern Physics: Classical Mechanics
oh i get it... nevermind. hes just doing the difference in the force over time = mv right? and since he has that differnce in f it give him a difference of the velocity thus acceleration. right?
zalorthethird 3 months ago
sorry.... diferentiations* how does he get the acceleration from f(x)=mv? this somehow involves calculus? or am i just missing something....
zalorthethird 3 months ago
im confused with these difernciations. do I need calculus to understand the rest of this course?
zalorthethird 3 months ago
@zalorthethird Yes.
acr08807 1 month ago
I feel like you had to take high school physics first before watching this :(
EmpereurNapoleonex 4 months ago
lol the students are making it more difficult that it needed to be
EmpereurNapoleonex 4 months ago
Susskind is brilliant. He makes it very simple and easy to understand.
HabeKeinMitleid 4 months ago
29:30 you want to be able to predict what is going to happen in any given interval in a room full of people? good luck :P I suspect that this guys thinking is sort of deterministic, but i can bet you that one person lifts his hands, and the prediction of where all molecules in a class room is going to be, is going to be wrong. but that is beside the point i know.
sintje21 4 months ago in playlist Leonard Susskind - Modern Physics
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.
SalsaTiger83 4 months ago
ok im done torturing my brain now bye
CantWeedThis 5 months ago in playlist Course | Modern Physics: Classical Mechanics
It's like music. I teach music and post videos on it frequently. This is a lot like chords progressions in music.
legatolaurel 5 months ago in playlist Course | Modern Physics: Classical Mechanics
Time cannot begin. Without time, how can anything begin?
JesterGren 5 months ago
@JesterGren Everything has a beginning... It's just, we don't know how somethings began.
monsterhunter99 5 months ago
@monsterhunter99 Anything without time would be equally timeless. It can not be 'before' or 'after'. It can only exist as imaginary numbers exist on the number line. We can claim ignorance, but there is no reason to act against logic or the principles of physics.
JesterGren 5 months ago
Comment removed
PavelKrupets 5 months ago in playlist Course | Modern Physics: Classical Mechanics
@JesterGren How do you know whether time can begin?
acr08807 1 month ago
@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.
JesterGren 1 month ago
amazing how we can watch university lectures on the internet nowdays
ProducShuns 5 months ago in playlist Course | Modern Physics: Classical Mechanics
@ProducShuns Too bad we can't graduate from them.
mikeizuzzum 4 months ago in playlist Course | Modern Physics: Classical Mechanics
240p we meet again.
boxerek123 5 months ago
i love how he talks explicitly.
blehfish 5 months ago
See this is why I like the internet its like college except its free and you make your own schedule.
snuckles108 5 months ago in playlist Course | Modern Physics: Classical Mechanics 64
I wonder if he could explain how building 7 collapsed? I bet he can do a better job than that bogus (NIST) report.
LoveCannon911 5 months ago in playlist Course | Modern Physics: Classical Mechanics
*scratches head*
TheSyrupMan 6 months ago
thnx sir! now i understand classical mechanics little bit.
Ajit1986kumar 6 months ago
i think classical mechanics is really easy!!
absolutemes 6 months ago
@absolutemes spot on bro.
debuprabhaldas490 4 months ago
these kids asking questions him questions are scrubs
pawnshopr 6 months ago
I would say the statement time evolves continously is paradoxical, because there are intervals within time which are also continual. The same way that inbetween 1 and 2 it would be possible to place an infinite amount of decimal numbers in an infinite amount of variety and no matter what is put there is always a midpoint inbetween the next 'pulse' and the previous, 0 to 1 is .5 as an example and it can be divided by two infinitely, also 1.11 inbetween each 1 is an imaginery distance/interval.
pawnshopr 6 months ago
@pawnshopr
Whether time evolves continuously or not, that's the premise upon which classical mechanics is based - at least according to Prof. Susskind.
You may be right, of course. Time might occur in discrete packets just like matter 'seems' to. But definitely not in classical mechanics.
PLecN 6 months ago
@PLecN yeah I know :d we assign deterministic rules in order to create contants that we use as a foundation for other mechanics.... but in our realm there will always be random bell curves... But back on topic, I could even place "there will always be random bell curves" as some kind of determined law because 'always' would place the rule and it would be continually random as to where there will be a bell curve. So in a sense it does evolve continuously but also at the same time it does not.
pawnshopr 6 months ago
@PLecN im just on a tangent sorry lol this guys completely right im not arguing just being random pretty much xD
pawnshopr 6 months ago
@pawnshopr Yes, that's why my nose never touches the wall when when I walk across the room dividing each subsequent space in half; plus, I'm still waiting for Achilles to catch that Tortoise!
fc2122 6 months ago
@fc2122 when when? Okay I don't really understand what you mean to express with all those words. Namaste.
pawnshopr 6 months ago
Comment removed
pawnshopr 6 months ago in playlist Course | Modern Physics: Classical Mechanics
i love how nearly every statement he makes, he follows it with another statement clarifying/descrbing something he said in the previous statement. so 20 thoughts later you finally undestand what he meant 20 thoughts ago lol
Cervy18 6 months ago in playlist Course | Modern Physics: Classical Mechanics
Great lecture but i feel kind of bad for the guy; the questions asked by the students just seemed really nitpicky and not really having to do with the concepts susskind was presenting. Maybe it's just me.
Great lecture (series) all in all. It still blows me away that resources like this are so freely available nowadays.
roygbiv610 6 months ago 32
@roygbiv610 you understand physics well?
truepatriot1992 3 months ago in playlist Course | Modern Physics: Classical Mechanics
@roygbiv610
Its not just you, its the one thing I miss least about college, both being a student and a teacher, and that one thing is when students ask distracting and inconsequential questions that say "to-MAY-to" when the professor says "to-MAH-to", many times (presumably) to hear their own voices. Its very, very annoying, and the one tiny island of satisfaction I found when dealing with it was to berate the students that did so in my classroom.
Case in point: Using words like "bifurcate".
PazGuerro 1 month ago
@PazGuerro that makes you a dick. students should have an environment where they can ask questions. have you forgot why you were employed and paid. you sound like an employers worst nightmare, a workshy and self indulgent tosser on someone elses dollar.
derwall2005 1 month ago
@derwall2005
Perhaps I am a dick, but I received positive comments from all of my students, and one of the biggest compliments to me was that I made learning "comfortable".
Students should ABSOLUTELY ask questions, but one thing they should NEVER do is disrupt, interrupt, or distract other students, and when you ask questions that do not apply to the topic on hand, or that merely satisfy your own ego, you are a distraction to my other students and to the lecture.
PazGuerro 1 month ago
@PazGuerro They said "bifurcate" because they didn't know the word "subgroup," and they clearly didn't understand what Susskind was driving at. If your idea of dealing with questions from people who didn't get it was to berate them, forget being a bad teacher, you're just an asshole.
acr08807 1 month ago
@acr08807
Actually, I clearly stated that it came only to students who were regular distractions to other students by asking questions more appropriate during office hours. Grasping the concepts I presented was of course priority number one for me.
And yes, I am an asshole, but I still received very positive reviews from my students, so perhaps I am merely misrepresenting what actually went on in my classroom?
Regardless, some students speak to hear their own voices. Agreed?
PazGuerro 1 month ago
@PazGuerro You can also speak with students outside class instead of berating them. Berating isn't education, it's playing an ego game, just like talking to hear your own voice is.
acr08807 1 month ago
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Freedomloveandtruth 7 months ago
I cant draw them endlessly it would take forever. LOL!
wertacus 7 months ago
very good explanation of classical mechanics which comparises mainly of nutonian mechanics i loved the vedio.
saurahraj123 7 months ago in playlist Course | Modern Physics: Classical Mechanics
At what frame rate does the universe move?
Dylithe 7 months ago
Do physicists actually consider this when postulating laws? It's a damn shame a part of the lecture is missing, this is great stuff. =/
AleifrLeifrson 7 months ago
@AleifrLeifrson I do consider this when postulating laws but still its not very useful later on in the process.
PhD
Astrophysicist.
togozzer232 7 months ago
@AleifrLeifrson We consider the underlying idea behind this lecture, symmetry groups. It's hard to give a simple description, but every conservation law is linked to a symmetry (something that doesn't change) in physical law (for example, conservation of energy is a consequence of physical laws being the same at all times).
acr08807 1 month ago
@AleifrLeifrson Everything that Susskind says between defining a state and discussing the relationship between dimension of a state space and the order of the differential equations of physical laws can be summarized in one sentence: States form a group under physical law. Since he doesn't assume that his students know group theory, he has to take more time to explain. Group theory (including its branch, representation theory) is one of the most useful tools in theoretical physics today.
acr08807 1 month ago
Someone explain this? If you have a rule saying H > H and T > T. That's a totally acceptable rule according to the video.
How does it come then, that when you add information the rule becomes invalid and non regressable. Namely by creating the sets HH>H, TH >H, TT>T and HT > T.
In this rule the previous rule is still valid, yet as a whole it becomes invalid. Does this mean that if I find the second 'pattern', I should dismiss it and go for the more simplified previous rule? Seems strange.
Rantoro 7 months ago
@Rantoro You can always write down a rule that sends a two-bit state to a single-bit state like the one you mention (HH -> H etc) but it won't be a valid 'law of physics' because a valid law must send two-bit states to two-bit states even to be considered.
PLecN 7 months ago
@PLecN Makes sense to dismiss the example I gave as invalid rule as whole. Does seem odd that a trivial change in the premise, 2bit to 1bit wouldn't be an option in science :D I guess that's why there are rules hehe :)
Rantoro 7 months ago
@Rantoro It will become more obvious later in the course that this is a technical requirement.
In order to describe the state of a particle say, you need two bits of info - position and momentum at a given instant. If u know the state now and want to predict the future state, u need to plug two bits into a 'rule' and get two bits out. If only one bit comes out - position say - then u can't predict the state, since state means both position *and* momentum. (I think that makes sense !!)
PLecN 7 months ago
@PLecN Measurement problem
pawnshopr 6 months ago
@Rantoro in classical mechanics we have strict determinism. That is given a state and the laws you should be able to find out previous state(or future state).
In the rule you describe HH and TH both evolve to H. So in case you are given H you can't find whether it came from HH or TH. Thus the system you described isn't deterministic. However in a system which has the law H>H and T>T , we can find out past/future state given present state.
Susskind calls this conservation of information.
MegaFormaldehyde 6 months ago
Excellent presentation of compressed concepts
SiriusLight 7 months ago in playlist Course | Modern Physics: Classical Mechanics
tails tail goes to tails tail?
peterpickaxe09 7 months ago
This video is very useful.
saijai587 8 months ago
I like this video.
kopi5896 8 months ago
Thank you for sharing.
minami935 8 months ago
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....
ripperduck 8 months ago
As soon as he started writing equations my mind became foggy
boarding5401 8 months ago
Is this Physics 40, or 60 at Stanford?
freezingbeast 8 months ago
Hmm the concepts here seem quite advanced to me. I self taught myself up to vector calculus so I understand pretty much all the maths here, but I'm having troubling following the concepts at this abstract level. Perhaps one or two more specific examples throughout the course would have helped me greatly.
Liaomiao 8 months ago
@Liaomiao
I could do a video or something if you'd like some help
give me an example of something you don't quite get and I'll do my best to explain it with an example or two?
HelloIAmDaniel 8 months ago
With respect to the level of depth are these courses on par with undergraduate education in physics? I'm talking about all of Professor's Susskind's lectures up to String Theory.
Liaomiao 8 months ago in playlist Course | Modern Physics: Classical Mechanics
@Liaomiao
Pretty much no level. These lectures are interesting, but they aren't really up to par with academic courseloads, especially without the "work" and tests one would normally have to do. These lectures are more like what light-reading/(reading for fun) is to actually putting work and study into a textbook. Not saying that the content is trivial, it's just that this isn't how school is like.
TheElMarsh 8 months ago
i love this guy!
checkeraka47 8 months ago
what is the mathematics he used there? sorry for my wrong grammar...
I completely understand the words, but not the board work.
niconikko 9 months ago
@niconikko graph theory
TheOvermaster 9 months ago
I just want to say that I am so grateful that these lecture series are made available. They are very very helpful.
pleiadian 9 months ago
I loved this, thank you! Why spend a fortune in university when you can just learn this stuff for free on youtube, learn what you're good at beforehand so when you do get a degree you not only know what you'll enjoy or be good at in university but be knowledgeable enough through online lectures to score well at the end.
It was embarassing though when the douche in the audience kept interrupting though, I imagined the professor saying "If you don't shut up I'll give you cement shoes asshole!"
Standuble 9 months ago
HES GREAT...LOVE THE LECTURE
meat321 9 months ago
Is this lecture series complete?
sgsawant 10 months ago
Is this lecture series complete? If not is it going to be complete?
sgsawant 10 months ago
@sgsawant . Yes this lecture series is complete. It is part of a Stanford series - Modern Physics:A theoretical minimum. Please visit the wikipedia article of Leonard Susskind. There in a section called lectures, the order in which the lectures were broadcast are given. Apparently there is some goofup in the lecture titles. As the lectures on quantum entanglements also cover special relativity . :)
MegaFormaldehyde 6 months ago
I hate physicists.
Grimmjow567 10 months ago
@Grimmjow567 what are you, some math major?
TheOvermaster 9 months ago
@TheOvermaster Nah.
Grimmjow567 9 months ago
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HenningStrandin 10 months ago
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HenningStrandin 10 months ago
huh?
degario1 11 months ago
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.
ArsLumen 11 months ago
his students lack imagination , it is really more important than knowledge
and000n 11 months ago
I like how I can fast forward him, unlike my real professors.
Terrakinetic 11 months ago 2
@Terrakinetic and rewind him.:P
ErichoEricho 11 months ago
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.
YouGoByeBye 11 months ago
@YouGoByeBye Its an unfortunate thing... In schools it seems math teachers are certainly interesting in explaining HOW to do math... but simply not interested in explaining it in a form that creates a picture in the students mind of what the hell is going on.
Nobody can be seriously asked to hold abstract rules in their head without being shown what is going on. Later on they can see that picture in the math...but at the outset there is no frame of reference.
MumblingMickey 10 months ago
@MumblingMickey This is a physics class in which theory is more important than the mathematics behind it. The students are expected to understand the math already given that there is a prerequisite for the course. Physics by nature is applied mathematics.
XxBrian88xX 10 months ago
@XxBrian88xX yeah erm... I think I sort of already got that...several decades ago... lol!
MumblingMickey 10 months ago
@XxBrian88xX
Physics is way harder than applied mathematics. Applied mathematics requires no physical intuition or experimental verification.
ExhumedANDConsumed 9 months ago
This comment has received too many negative votes show
sir, i don know what happened to you, but you are so full of anger, fear and guilt, it comes off the first sec... maybe its someone, maybe its the catholic church that instilled this much fear on you...
despite of your knowledge, i repeatedly tried to listen to you, but watching this i got the urge to hide under my desk..
listening to you is a real torture
thanks for trying though, maybe you should introduce eastern phylosophy in your life or just go on a holiday to rehab for t rest of ur life
frostwow 11 months ago
@frostwow
???
wosclub 11 months ago
@wosclub I didn't get it either.
JmSantos78 11 months ago
@frostwow What the hell are you talking about?
JmSantos78 11 months ago
@JmSantos78 from what i got ( witch isn't much) all he is saying is that nothing is just guna switch it self in to anything else. gold can't become lead. ...... i think
thatdude2468 10 months ago
he looks like john malkovich and sounds like the grandfather from king of queens
bldubl 1 year ago
I have no choice. We're going to have to... add velocity into the equation.
JollyFootPrint 1 year ago 2
I am subscribing right away:)
zairt 1 year ago 2
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madrazel 1 year ago
he wastes alot of time
TheCrappyaccount 1 year ago
@TheCrappyaccount None of our opinions matter. Least of all, yours.
VrokKragen 1 year ago
this guy is always talking about flipping coins and rolling dies. that is a red flag for a gambling problem
joeglimmix 1 year ago 15
@joeglimmix Or a Statistical Mechanics freak
italouruguayricano 4 months ago
@joeglimmix it is actually a very common example, in statistics for example, because both have very limited possible events and are thus easy to examine. Im only at 3 minutes by now but just felt like i'd leave the comment right now...
Martcapt 4 months ago
@Martcapt haha i was just joking. actually, i am a statisician myself so I have done my fair share of homework problems involving dice and coins :)
joeglimmix 4 months ago
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FallofDarkness55 1 year ago
I love how sometimes he calls the pen and the white board "chalk and blackboard".
paulojunior201 1 year ago 47
@paulojunior201 politically thats correct. Its "Pollitically UNCORRECT" to say black board or white board,
or "Ba ba BLACK sheep , have you any wool." It's actually "Ba Ba RAINBOW sheep"
Political correctness is stupid
boohooimsad 1 year ago 4
@paulojunior201 That shows the kind of teacher he is. The good old fashion kind :D
webmastertool 1 year ago
@paulojunior201 : Its good that u noticed, but let's respect to his explanation.
durga121 7 months ago