You're forever a treasure in the eyes of men in this world. You've blessed me tremendously right from high school and now, am a successful engineer. Thanks Prof. Emeritus Walter Lewin. You're a gemstone
i always used to think how two magnets repel each other what force in universe was acting there. I am in finance field but your videos keep my love for science alive.
i have a professor in my collage who put 3year of his life in finding different way's to make perpetual motion machine and fail'ed constantly and got so much irritated he left physic's and switch to history
I'm amazed with how much things we can learn with you, Mr. Lewin. I feel like a grandson learning with my grandfather Walter. Thank you for so much adventures in your channel! Regards from you Brazilian greatest fan!
Hello Mr Walter Lewin, I am happily surprised to find out that you have a channel on TH-cam to carry on with you lectures! I am a 36 years old father living in London, my son is 5, and until a couple of years ago I didn't even know anything about yourself. Now, as time goes by (inevitably I must say), we all get wiser, and I got wise enough to see that wisdom itself can only get more "Lewin", trying to catch up with you... There is this one thing that makes me rather sad...my heart is in sorrow every time I watch any of your beautiful lectures....and that is so because I know I will never have the chance to shake your hand...and thank you in person. I must buy one of your books, one day I will, and I will cherish it, no doubts At the cost of sounding overwhelmed, you are so dear to me and I look up to you immensely. Thank you from the bottom of my heart for what you have given to the younger generations throughout your entire life. Sebastian
Dear, Sir Walter Lewin We are taught in school that friction can't be neglected. And some days ago I came across a term called superfluidity which was defined as a liquid with zero viscosity,hence frictionless. So, sir, my question to you is that is it true that friction can be neglected ?
Nope... No superfluid exists so friction cannot be neglected but there is an 🌟exception "helium when cooled down and turned into liquid it behaves like a superfluid and no friction is present.. suppose it is in an container so liquid helium will not touch the bottom and will try to move upward giving you an illusion that it opposes gravity"
@@Fizikakaalda well i came to know helium-4 is a proper Superfluid .helium-4 is the superfluid form of helium-4, an isotope of the element helium. A superfluid is a state of matter in which matter behaves like a fluid with zero viscosity. The substance, which looks like a normal liquid, flows without friction past any surface, which allows it to continue to circulate over obstructions and through pores in containers which hold it, subject only to its own inertia.
Mr Lewin l cant thank you enough or express to you inthe terms that would do justice to the enjoyment that get from watching your video...the one with your daughter is special to me as l believe children are our future and they themselve are the living proof that there is perpetual motion.... people keep going and when they dont no one will be asking if there is such a thing....oh... by the way l pick up a little bit from each time l watch your videos ....they are great however, l never graduated H. S. or got a GED...I'm not proud of that....honestly lve watched some of your lectures a dozen times each and still couldnt solve one problem that you had given to your class....but, l will watch them a dozen more and if l still dont get it l' ll watch them a dozen more... maybe l should try a bakers dozen....anyway maybe if we designed a human powered motor with magnet assist kinda like how hydraulics increase the ability to lift an otherwise wieght to heavy for a man to lift the n, by using the the magnetically assisted human powered motor...we could go places without being dependent on gas , batteries, solar or , any other energy source other than our own ....l understand that even a magnet will loose its strength but ,l still think its worth a shot to find out how long or how power we could get from one....magnetically assisted human powered motor...and perhaps a good application for such a thing might work well on a bicycle for example ...what do you think ...l'm really not expecting that you should answer this text however, its an idea l wanted to share
yes yes yes. A very clever circuit machine that might cause several to tickle up their brain. Thank you for providing the solution to this problem which has snatched my sleeps. Eagerly waiting for next problem🤗🤗. Have a healthy day With regards- from 🇮🇳🤗😊✌️
I had a physics related question ( i doubt that you'd have the time to read this ) but I'll still ask . Does electricity follow the path of least resistance or the path of least distance? Since electricity could travel faster in a less resistive conductor but it would take less time to travel in a shorter conductor.
He is such a real-life hero, who always follow his passion and that's why he enjoys physics at this age, he just not teaches just like a job ... I'm inspired form him, with his lecture I able to clear jee exam last year ..
A good chuckle was summoned upon hearing that people not only thought perpetual motion possible, but the rotation of earth being the cause of this efficient toy
Interesting. I like the one with the 4 magnets. I am going to make one for my grandchildren. And it reminds me of your lecture with the bowling ball pendulum on a long wire and your trust that the ball would not swing back any higher. :-)
Sir @Walter Lewin , I found something on 0:07, there one of those balls connected by the same rod, *stuck* to a hinge which i think , it is kind of a softer material !!. Will it not be supposed to change the momentum of running oscillations. That collision should supposed to have affected the whole system. Isn't it so !! I request you to kindly slow down the speed of video at 0:07 and look at the acute collision !! That's probably in between 0:07 to 0:08 🙏Radhe Radhe 🙏 (Greetings from India)
More accurately, the battery-powered circuit produces a like pole UPWARDS (with its somewhat hemispheric volume of effect), so the acceleration in the preferred tangential direction is merely the result from vector components, the pendulum's inertia that helps to overcome any premature or residual repelling field, and the pendulum's fixed length and pivot. This way, the pendulum is accelerated in both strokes.
sir, i have a question : can we displace an object in a gravitational field away from the gravitational source without applying any force(work) (like by teleportation,or by a space warp maybe) ?. And how will the condition of object be affected in every possible way. Same question with a charge in a electrical field too.
motion of planets around the sun last many billions of years. You could call that a perpetual motion. A perpetual motion machine is a hypothetical machine that can do work infinitely without an external energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.
Hello Walter! First of all how are you doing? Secondly, I just wanted to let you know I received your book as a birthday gift. I asked for it a while ago! Thanks for inspiring me to pursue physics! Hope you have a lovely day!
Before you decide to buy a book from me *I strongly suggest you get a free copy using the pdf file.* fiisikis.weebly.com/uploads/5/4/9/3/54939617/for_the_love_of_physics.pdf You should also consider to buy my book at amazon in your country. *I have been told that in India you can get my book from Amazon for $7!!!!* If you can afford it, of course, I am still willing to send you a signed copy of my book with *a special note for you + a signed picture of me, which will also have your name on it,* but the price is high as I pay 30% tax here in the US of your payment. Postage for me is also high (e.g., India $41). Your total costs for 1 paperback copy: US $42; Europe, South America, Brazil, Canada, Pakistan, Nepal, Bangladesh & India $78; Middle East & Asia (Japan, Philippines, China & Thailand) $82; Australia $85. You should transfer the money to my PayPal account (see below). *Since we are friends, please mark "family and friends", PayPal will then not charge me a 5% fee* and please let me also know in PayPal your name and complete address and *which name I should use for my note in your book and on my picture.* *For those of you who only want a signed copy of the picture of me, swinging from the pendulum,* with your name on it as well, it will cost you *$12 for 1 copy* (that includes postage). It's the same price for all countries. *You should send me on PayPal your complete address and the name you want me to write on the picture.* Please transfer the $12 to *my PayPal account which is* lewin-physics@physics.comcastbiz.net. *Since we are friends, please mark "family and friends", PayPal will then not charge me a 5% fee.* *Keep in mind that you must first enter PayPal and then my account.*
I’d love to see a demonstration showing how propulsion works in space!! I understand the theorys, “conservation of energy” and “reaction to all actions...”, BUT, it still bothers the hell out of me mentally! With nothing to push against, how does the propulsion gases propel the spacecraft? Why isn’t the reaction, the gasses going off in the other direction in space? Isn’t that where the energy goes, into the gas particles going off into space...? Just can’t mentally visualize this... THANKS FOR YOUR VIDEOS!!!
Hey, so I'm not the person in the video, but maybe I can explain this. Of course, there is nothing to push against in space. Everything relies on newtons third law: "For every action, there's an equal and opposite reaction". Which, in practice, means that whenever a force is applied on an object, an equal force is applied to whatever is pushing it. You can test this yourself with the help of a lawnmower, or something else heavy. Stand upright on a flat surface and strongly push the lawnmower away from yourself. You'll notice that the lawnmower is moving away in one direction, but you're also being pushed in the opposite direction. If you don't counteract this force, you would fall over. Now, a similar thing to this happens when a rocket flies through space. The gases produced by burning the fuel inside the rocket are being propelled away from the rocket at high speeds, which pushes the rocket in the opposite direction. The rocket is acting a force on every single molecule of gas, so every molecule is also acting a force on the rocket. This force may be tiny but with the incredible amount of atoms being pushed away every second, it adds up to a big, significant force. If we apply the example I've just mentioned onto this, then you would be the rocket, and the lawnmower would be the gases. Did this make it a little bit clearer?
Watch all my 94 MIT course lectures. Start with 8.01, then 8.02, then 8.03. Do all the homework and take all my exams. *I guarantee you that you will then do very well on the Physics portion of any freshman college or JEE exam* You will find all information you need on this channel (notice the three playlists "Homework & Solutions")
Hey professor 😂😂😂😂😂😂. Thanks for that. Well I have a question !!!! Is it possible for systems at 0K to have perpetual motion. Cause the radiation of energy is not possible at 0K. For instance your system, What happens when we start the motion of the system at 0K and maintain that temperature. •Is that even possible to get the system into motion? Btw I love your videos and especially the dotted lines. It took me 1week to use that fluently.
Hi Walter, I thought of a rather straightforward idea involving a solution to something long waited for; still I think you are one of the few who can tell whether it is correct or not. Would you give me a hand?
It remains me of two kids on a seesaw. Any butterfly effect by the push from the magnetic flow must be balanced out by the increasing chaotic movement of the higher centered pendulum , and vis-a-vis. I would say if there was just the bottom pendulum alone being pushed ,the movement would get chaotic
Hello Sir, it came into my mind the PC cooling Fan with magnets glued on its propellers and opposite magnets glued on the stator. I do understand that the magnets will get used (? 🤔) in time and lose their strength?
NO not possible. You have a misconception about the words "perpetual motion". Use google. A perpetual motion is not something that never stops (such as an electron in an atom).
@@lecturesbywalterlewin.they9259 I did just that WL, before i simply read the first couple of lines under the search results but 1 had the actual explanation of what's needed, and everything falls apart instantly doesn't it. I literally fooled myself into that misconception for years I've thought the same thing, I'm pretty sure there is a majority who thinks the same. I kind of hope so too ha ha. thankyou professor.
Sir, gravititional force is an internal force or an external force???.... Well my friends told me that it's an internal force but if i consider the block (while it is falling) as the system... the force is done by the earth on the block( system).... so it should be an external force ... right?? :/
drop an object from the roof, grav force is an external force and thus momentum is NOT conserved. The Earth moves around the Sun. It's kept in orbit by grav force from the sun. It's an external force and therefore momentum is not conserved.
I got a problem was trying to solve this and i ve no idea what to do. A simple harmonic motion y=4sin2Π (international system) propagates from the right to the left in an elastic medium with a speed of 12m/s. Calculate the enlogation point, which is 6m from the focus, at the instant t=3/4s. 1st try 6m from the focus x=0 it moves 12m/s that means after 0.75s is moved -9m to the left Since is 6m from the center 6-9=-3 Y=4sin(2Π(x-9) when x = 6 ? Y= -1.29. . . But what im calculating the enlogation thats must be wrong 2sd try Y=A sin (wt-kx+ц) w=2Π/T T=2Π/w that 2Π/2Π= 1 ? V=л/T=л•v = w/k caution with that v of frecuency -12=-12/1=2Π/k k=-0.53. . . Third try 4sin(2Π•3/4-2Π/12-9) Or 4sin(2Π•4/3-2Π/12-9) Even 4sin(2Π•4/3-2Π/12) I will ve a look to the harmonic motions lectures but still professor or someone able to give me some tips or find my error because this is supposed to be easy and i dont want to stay like the little brain muscled mass im. Many thanks and good day to everyone hugs
Is there a coil in it, that produces a magnetic field? I think, this is interesting. I often saw experiments in Physics with a coil. This pendulum is a nice construction. It isn't possible to predict, when the swinger will change the direction.
Sir in defination of perpetual motion it is written that it work infinitely without any energy source but here it has battery which provide energy...??
This video is going to be In everybody's recommendations.
Right
But Why?
I'm from there
It just appeared in mine!
How tf did you knew
You're forever a treasure in the eyes of men in this world. You've blessed me tremendously right from high school and now, am a successful engineer. Thanks Prof. Emeritus Walter Lewin. You're a gemstone
You're awesome Professor. People like you make a difference in the world! This is what real teaching should be everywhere!!!
"Hello hello hello" this makes my day each time I start it with you Sir. God bless you❤
Amen
I'll show my dad this video, he likes this kind of toys. Thank you, Mr. Lewin, grettings from Colombia 💖
i always used to think how two magnets repel each other what force in universe was acting there.
I am in finance field but your videos keep my love for science alive.
Hello sir.. May god bless you with long life ❤️
He is breaking law of physics, you were saying may God bless you??
Bless
YES GOD BLESS HIM AND PRAY TO GOD, HE BLESS US WITH HIS EXTRAORDINARY PHYSICS KNOWLEDGE.🙂
@@karthicksrinivasan7637 HE DIDN`T BREAK THE LAWS HE ONLY PLAYED WITH THE LAWS. A GREAT PERSON. MAY HE LIVE LONG!
you mean light ;)
I just realized i got pranked by a great physics professor😂😂
😂😂👍
i have a professor in my collage who put 3year of his life in finding different way's to make perpetual motion machine and fail'ed constantly and got so much irritated he left physic's and switch to history
GREAT SIIIIIIIIIIR.....😂😂😂
real story i believe
He can buy this
So modest of you to say that we are friends, sir.
I'm amazed with how much things we can learn with you, Mr. Lewin. I feel like a grandson learning with my grandfather Walter. Thank you for so much adventures in your channel! Regards from you Brazilian greatest fan!
Hello Mr Walter Lewin, I am happily surprised to find out that you have a channel on TH-cam to carry on with you lectures!
I am a 36 years old father living in London, my son is 5, and until a couple of years ago I didn't even know anything about yourself.
Now, as time goes by (inevitably I must say), we all get wiser, and I got wise enough to see that wisdom itself can only get more "Lewin", trying to catch up with you...
There is this one thing that makes me rather sad...my heart is in sorrow every time I watch any of your beautiful lectures....and that is so because I know I will never have the chance to shake your hand...and thank you in person.
I must buy one of your books, one day I will, and I will cherish it, no doubts
At the cost of sounding overwhelmed, you are so dear to me and I look up to you immensely.
Thank you from the bottom of my heart for what you have given to the younger generations throughout your entire life.
Sebastian
8:16 Duracell is the solution to perpetual motion hahaha
Lol
XD
😂😂
Aww you broke my heart
Seriously, I wanted a review of this so much. Thanks, sir!
My pleasure!
One of the few people who is actually doing what he loves
Awesome Sir. Love from India🇮🇳❤
cant we appreciate the fact that we live in such an age that we won't consider it to be magic of some sort?
Dear,
Sir Walter Lewin
We are taught in school that friction can't be neglected. And some days ago I came across a term called superfluidity which was defined as a liquid with zero viscosity,hence frictionless. So, sir, my question to you is that is it true that friction can be neglected ?
Nope... No superfluid exists so friction cannot be neglected but there is an
🌟exception "helium when cooled down and turned into liquid it behaves like a superfluid and no friction is present.. suppose it is in an container so liquid helium will not touch the bottom and will try to move upward giving you an illusion that it opposes gravity"
But in that super fluid friction is neglected
It's viscosity becomes zero
@@Fizikakaalda well i came to know helium-4 is a proper Superfluid .helium-4 is the superfluid form of helium-4, an isotope of the element helium. A superfluid is a state of matter in which matter behaves like a fluid with zero viscosity. The substance, which looks like a normal liquid, flows without friction past any surface, which allows it to continue to circulate over obstructions and through pores in containers which hold it, subject only to its own inertia.
Mr Lewin l cant thank you enough or express to you inthe terms that would do justice to the enjoyment that get from watching your video...the one with your daughter is special to me as l believe children are our future and they themselve are the living proof that there is perpetual motion.... people keep going and when they dont no one will be asking if there is such a thing....oh... by the way l pick up a little bit from each time l watch your videos ....they are great however, l never graduated H. S. or got a GED...I'm not proud of that....honestly lve watched some of your lectures a dozen times each and still couldnt solve one problem that you had given to your class....but, l will watch them a dozen more and if l still dont get it l' ll watch them a dozen more... maybe l should try a bakers dozen....anyway maybe if we designed a human powered motor with magnet assist kinda like how hydraulics increase the ability to lift an otherwise wieght to heavy for a man to lift the n, by using the the magnetically assisted human powered motor...we could go places without being dependent on gas , batteries, solar or , any other energy source other than our own ....l understand that even a magnet will loose its strength but ,l still think its worth a shot to find out how long or how power we could get from one....magnetically assisted human powered motor...and perhaps a good application for such a thing might work well on a bicycle for example ...what do you think ...l'm really not expecting that you should answer this text however, its an idea l wanted to share
once we know the secret it becomes less intriguing - like knowing how a magic trick is done : )
that's the point of a magic trick....its magical cuz of the sole reason that we can't understand it
It should intrigue you more knowing how such a thing could be produced in such a simple fashion.
yes yes yes. A very clever circuit machine that might cause several to tickle up their brain. Thank you for providing the solution to this problem which has snatched my sleeps. Eagerly waiting for next problem🤗🤗.
Have a healthy day
With regards- from 🇮🇳🤗😊✌️
Sir you are legend in physics. Love you from India. May God you with long life❤
You omitted "bless"
Glad people of my country are learning physics beyond books
@@rammith5843 Alakh Pandey
I had a physics related question ( i doubt that you'd have the time to read this ) but I'll still ask . Does electricity follow the path of least resistance or the path of least distance? Since electricity could travel faster in a less resistive conductor but it would take less time to travel in a shorter conductor.
least resistance (Ohm's Law) watch my 8.02 lectures
This was what I was looking for! Thank you professor ❤️ much love❤️
He is such a real-life hero, who always follow his passion and that's why he enjoys physics at this age, he just not teaches just like a job ... I'm inspired form him, with his lecture I able to clear jee exam last year ..
A good chuckle was summoned upon hearing that people not only thought perpetual motion possible, but the rotation of earth being the cause of this efficient toy
Interesting. I like the one with the 4 magnets. I am going to make one for my grandchildren. And it reminds me of your lecture with the bowling ball pendulum on a long wire and your trust that the ball would not swing back any higher. :-)
Sir you are India's number one teacher
I was blessed to have it in my recommendation
Where did you get the kinetic toy? I want one!
Think you for your explanation!
God bless you!
It's marvellous Sir, and you're way of teaching is very unique, God bless you.
Jawaid Mughal Karachi Pakistan.
Sir @Walter Lewin ,
I found something on 0:07, there one of those balls connected by the same rod, *stuck* to a hinge which i think , it is kind of a softer material !!.
Will it not be supposed to change the momentum of running oscillations. That collision should supposed to have affected the whole system. Isn't it so !! I request you to kindly slow down the speed of video at 0:07 and look at the acute collision !! That's probably in between 0:07 to 0:08
🙏Radhe Radhe 🙏
(Greetings from India)
More accurately, the battery-powered circuit produces a like pole UPWARDS (with its somewhat hemispheric volume of effect), so the acceleration in the preferred tangential direction is merely the result from vector components, the pendulum's inertia that helps to overcome any premature or residual repelling field, and the pendulum's fixed length and pivot. This way, the pendulum is accelerated in both strokes.
sir, i have a question :
can we displace an object in a gravitational field away from the gravitational source without applying any force(work) (like by teleportation,or by a space warp maybe) ?. And how will the condition of object be affected in every possible way.
Same question with a charge in a electrical field too.
Thanks it was pleasure to be with you
Sir but gravitation rotation of earth is a perpetual motion 🤔 so can we use gravity with mechanics to form a perpetual motion machine
motion of planets around the sun last many billions of years. You could call that a perpetual motion. A perpetual motion machine is a hypothetical machine that can do work infinitely without an external energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.
Sir indians were the first to work in the field of perpetual motion.
I want to see all his lectures but the pressure of theoretical exam pushes me back😶
Me too
Professor, I have a question, how can I learn physics from the beginning?
eat yogurt every day but *never on Friday*
@@lecturesbywalterlewin.they9259 Typical physics teacher's answers.
@@lecturesbywalterlewin.they9259 😂😂😭
@@lecturesbywalterlewin.they9259 Can anyone tell what does that mean?
@@lecturesbywalterlewin.they9259 What does it mean, professor?
Very interesting. Thank you
Waooo... Exact solution which I provided on the problem video...
I was right
Legends are getting old but still young at heart❤👏
Not really that old
Hey what is the name of the machine (the so called perpetual motion). I want to buy it. I've tried to search on the internet but haven't found any
Space balls perpetual motion, sadly its been discontinued since late 1980's... but there some similar designs on Ebay.
Hello Walter!
First of all how are you doing?
Secondly, I just wanted to let you know I received your book as a birthday gift. I asked for it a while ago! Thanks for inspiring me to pursue physics!
Hope you have a lovely day!
Sir this is really super....🤯🤯
Prof! When will you start mailing your signed book copies this year?
Before you decide to buy a book from me *I strongly suggest you get a free copy using the pdf file.*
fiisikis.weebly.com/uploads/5/4/9/3/54939617/for_the_love_of_physics.pdf
You should also consider to buy my book at amazon in your country. *I have been told that in India you can get my book from Amazon for $7!!!!*
If you can afford it, of course, I am still willing to send you a signed copy of my book with *a special note for you + a signed picture of me, which will also have your name on it,* but the price is high as I pay 30% tax here in the US of your payment. Postage for me is also high (e.g., India $41).
Your total costs for 1 paperback copy: US $42; Europe, South America, Brazil, Canada, Pakistan, Nepal, Bangladesh & India $78; Middle East & Asia (Japan, Philippines, China & Thailand) $82; Australia $85. You should transfer the money to my PayPal account (see below). *Since we are friends, please mark "family and friends", PayPal will then not charge me a 5% fee* and please let me also know in PayPal your name and complete address and *which name I should use for my note in your book and on my picture.*
*For those of you who only want a signed copy of the picture of me, swinging from the pendulum,* with your name on it as well, it will cost you *$12 for 1 copy* (that includes postage). It's the same price for all countries. *You should send me on PayPal your complete address and the name you want me to write on the picture.* Please transfer the $12 to *my PayPal account which is* lewin-physics@physics.comcastbiz.net. *Since we are friends, please mark "family and friends", PayPal will then not charge me a 5% fee.*
*Keep in mind that you must first enter PayPal and then my account.*
Oh i found the working Thanks sir for going into past and making these video before i comment today morning! :)
Does that white ball pendulam stop without any intervention??
What is the name of this???
Thank you for sharing your knowledge with us... keep going.
I’d love to see a demonstration showing how propulsion works in space!! I understand the theorys, “conservation of energy” and “reaction to all actions...”, BUT, it still bothers the hell out of me mentally! With nothing to push against, how does the propulsion gases propel the spacecraft? Why isn’t the reaction, the gasses going off in the other direction in space? Isn’t that where the energy goes, into the gas particles going off into space...? Just can’t mentally visualize this... THANKS FOR YOUR VIDEOS!!!
Hey, so I'm not the person in the video, but maybe I can explain this. Of course, there is nothing to push against in space. Everything relies on newtons third law: "For every action, there's an equal and opposite reaction". Which, in practice, means that whenever a force is applied on an object, an equal force is applied to whatever is pushing it.
You can test this yourself with the help of a lawnmower, or something else heavy. Stand upright on a flat surface and strongly push the lawnmower away from yourself. You'll notice that the lawnmower is moving away in one direction, but you're also being pushed in the opposite direction. If you don't counteract this force, you would fall over.
Now, a similar thing to this happens when a rocket flies through space. The gases produced by burning the fuel inside the rocket are being propelled away from the rocket at high speeds, which pushes the rocket in the opposite direction.
The rocket is acting a force on every single molecule of gas, so every molecule is also acting a force on the rocket. This force may be tiny but with the incredible amount of atoms being pushed away every second, it adds up to a big, significant force.
If we apply the example I've just mentioned onto this, then you would be the rocket, and the lawnmower would be the gases.
Did this make it a little bit clearer?
Where can I buy this thing
Absolutely right sir.. Thanks a lot👍✌️✌️✌️
Sir how to full marks in physics in jee?
Sir please don't tell me to eat yogurt except Friday😅...
Please suggest any other method pl🙏
Watch all my 94 MIT course lectures. Start with 8.01, then 8.02, then 8.03. Do all the homework and take all my exams. *I guarantee you that you will then do very well on the Physics portion of any freshman college or JEE exam* You will find all information you need on this channel (notice the three playlists "Homework & Solutions")
@@lecturesbywalterlewin.they9259 thank you very much sir.
I am eating yogurt everyday.
@@lecturesbywalterlewin.they9259 🙏 Thanks sir
Sir what if I make it to MIT? Even though you're retired, would you still take me under your wing?
Hey professor 😂😂😂😂😂😂.
Thanks for that.
Well I have a question !!!!
Is it possible for systems at 0K to have perpetual motion.
Cause the radiation of energy is not possible at 0K.
For instance your system,
What happens when we start the motion of the system at 0K and maintain that temperature.
•Is that even possible to get the system into motion?
Btw I love your videos and especially the dotted lines.
It took me 1week to use that fluently.
I have learnt about perpetual motion machine in chemistry so I am here to see
This sir help me so much to understand physic. Im lucky that i come at this page
Hi Walter, I thought of a rather straightforward idea involving a solution to something long waited for; still I think you are one of the few who can tell whether it is correct or not. Would you give me a hand?
5:00 Sir How would be we can have "infinite" source of energy it's just a finite energy that's keep switching its type
I was thinking that lady is really talking on phone,realised it's a pic
same
Timestamp
Always great to hear your wisdom about physics. Awesome channel
Sir, the series of this problem is from where? From your book?
Loved it sir. I like how practical you are!
very well!! what a good toy. thanks very much
Such a huge relief that perpetual motion does not exist and approved by you too
8:19 movement 😅😅
❤️ professor
You can almost see the exchange of potential energy from ball to ball amazing
It remains me of two kids on a seesaw. Any butterfly effect by the push from the magnetic flow must be balanced out by the increasing chaotic movement of the higher centered pendulum , and vis-a-vis.
I would say if there was just the bottom pendulum alone being pushed ,the movement would get chaotic
I want that coupled oscillator!
Hello Sir, it came into my mind the PC cooling Fan with magnets glued on its propellers and opposite magnets glued on the stator. I do understand that the magnets will get used (? 🤔) in time and lose their strength?
no permanent magnets can keep this toy going - *PERIOD*
Is perpetual motion possible within a vacuum?
NO not possible. You have a misconception about the words "perpetual motion". Use google.
A perpetual motion is not something that never stops (such as an electron in an atom).
@@lecturesbywalterlewin.they9259 Thanks sir for clearing my doubt
@@lecturesbywalterlewin.they9259 I did just that WL, before i simply read the first couple of lines under the search results but 1 had the actual explanation of what's needed, and everything falls apart instantly doesn't it. I literally fooled myself into that misconception for years I've thought the same thing, I'm pretty sure there is a majority who thinks the same.
I kind of hope so too ha ha. thankyou professor.
Epitome of learning by doing...😀
I wish they taught us the same in school.
Wow ❤️ Great sir 👍
Sir, gravititional force is an internal force or an external force???....
Well my friends told me that it's an internal force but if i consider the block (while it is falling) as the system... the force is done by the earth on the block( system).... so it should be an external force ... right?? :/
drop an object from the roof, grav force is an external force and thus momentum is NOT conserved. The Earth moves around the Sun. It's kept in orbit by grav force from the sun. It's an external force and therefore momentum is not conserved.
sir your explanations are so nice that help me very much...........
Thank you sir
Brilliant explanation
Tell me the names of these physics toys
Prof. Lewin, Can I get that??
sir this will never stop or not ??
Wow I honestly didn’t expect it. I thought it was just gravity
Where to buy this coupled oscillator?
Proffessor what if we perform this model without magnet ..coz it's a kind of pendulum
At 8:36 , I Thought you would say. There is no such thing as " FREE LUNCH".
Professor, what about electron revolving around an atom?
Let's totally egnor why the planet's are still spinning around the sun,and just play with magnets! "Egnoring the obvious " lol love you walter.❤
*plantes moving around the sun is NOT a perpetual motion!*
@@lecturesbywalterlewin.they9259 and the universe is expanding faster because dark energy doesn't care😂
I got a problem was trying to solve this and i ve no idea what to do.
A simple harmonic motion y=4sin2Π (international system) propagates from the right to the left in an elastic medium with a speed of 12m/s. Calculate the enlogation point, which is 6m from the focus, at the instant t=3/4s.
1st try
6m from the focus x=0
it moves 12m/s that means after 0.75s is moved -9m to the left
Since is 6m from the center 6-9=-3
Y=4sin(2Π(x-9) when x = 6 ?
Y= -1.29. . .
But what im calculating the enlogation thats must be wrong
2sd try
Y=A sin (wt-kx+ц)
w=2Π/T T=2Π/w that 2Π/2Π= 1 ?
V=л/T=л•v = w/k caution with that v of frecuency
-12=-12/1=2Π/k k=-0.53. . .
Third try
4sin(2Π•3/4-2Π/12-9)
Or
4sin(2Π•4/3-2Π/12-9)
Even
4sin(2Π•4/3-2Π/12)
I will ve a look to the harmonic motions lectures but still professor or someone able to give me some tips or find my error because this is supposed to be easy and i dont want to stay like the little brain muscled mass im. Many thanks and good day to everyone hugs
His Hello! HELLO! Hello!.....feel like yeah....he is our physic teacher...salute you sir.......I hope I could meet u one day...🙂
Do we make it on large scale.???
Finally a better recommendation from youtube 😁😁😁❤️
Sir is there anyway in ideal world to have an undamped oscillations?
Love you effort and enthusiasm in physics SIR you are a great physicist and teacher too
I want to purchase this,where I can buy this??
شكرا 👍 جزيلا لك علي الاستمرار وحل المشكل..... نتمنى لك التوفيق..... 😎
Great 🤩
Many Happy returns of the Day 🎉🎉🙏
Sir can you please tell the name of this Physics toy... I want to buy it😊... By the way I am your big fan Sir... ♥️
amazon pe dekhle
Is there a coil in it, that produces a magnetic field? I think, this is interesting. I often saw experiments in Physics with a coil. This pendulum is a nice construction. It isn't possible to predict, when the swinger will change the direction.
Sir in defination of perpetual motion it is written that it work infinitely without any energy source but here it has battery which provide energy...??