This Lecture is a MUST! Work - Kinetic Energy - Potential Energy - Newton's Universal Law of Gravitation - Great Demos. Assignments Lecture 10, 11 and 12: freepdfhosting.... Solutions Lecture 10, 11 and 12: freepdfhosting....
@@PrinceKumar-hh6yn well actually then the velocity of the ball would be really really small. But due to the gigantic mass of that pendulum it'll still hurt a lot
No actually the air drag is there so there is a resistive force acting and thus there is a loss of energy so there would ve been no way that it would go past the initial postion
Sir, the demonstration at the end of this lecture is ,by far, the best. Hats off to you for such dedicated service towards teaching. Teachers like you are indeed, rare. I feel privileged that technology has allowed me to witness these beautiful lectures miles away from the classroom even after so many years.
as a 14 year old who has yet to touch calculus, the maths is a bit wonky but I seem to have grasped the basic concepts. Thank you for the strangely entertaining lecture, prof Lewin
Me too! I am also 14 y/o and have learnt by far , most of calculas, both differential and integral calculus from Internet. This is quite a fascinating topic that has helped me to grasp Sir Lewin's lectures. Thank God I learnt that before.
Hey professor, I wanted to say thank you for the way you teach physics. I'm not a physics student but recently I've been watching your lectures and the way I look at the world is not the same anymore and it's amazing. Now I love physics.
This lecture changed my life by making me want to become an engineer. It was last year when I was sad with my incompetence with physics so I thought I would relearn the concepts in terms of mathematics and calculus which they did not teach in high-school. I started off with work and energy. All my misconceptions were eliminated by watching this video in the summer and I ended up loving to derive everything from scratch. I thought I'd share my experience so I created a RU-vid video about how my physics teacher's notes were incorrect, and my classmates got him to project the video to the class! I had this amazing story to talk about in my university interviews and I ended up being admitted to the #1 university in Canada for Engineering thanks to it. You have my everlasting gratitude Professor Lewin.
really impressed by your lectures ! i have gone through your every video lectures ! this has really helped me get clear concept and has increased my craziness in physics !
I tell you professor, My teacher punished me and asked me to explain this in front of whole class! Students understood better than they usually when my teacher explains, and he was like “Woah” ! Thank You very much Sir! Love from India 🇮🇳
Sir I am from India and am a big fan of your teaching style..I am currently preparing for JEE which I will give after 3 years..your lectures are helping me a lot to understand the concepts in depth. Thank You Sir.😊
when I habituated to watch your lectures I thoroughly enjoying the lectures. I will not have any pen and paper while listening to your lecture.You are one of greatst teachers I have ever seen
Laws of conservation of energy show a lot of elegance and beauty of physics. Thank you for sharing it with the help of such beautiful and brave demonstrations!
Oh!! Professor!! You're the majestic person to determine, your life to make physics more engaging. These lectures were provided before my birth. And till the huge improvement of the learning system still, your lectures makes me fascinated every time :3
@@lecturesbywalterlewin.they9259 why cant the bob keep oscillating forever at the same height. Why does it lose energy is it air resistance? by the way big fan
Hello Professor! I enrolled in college at the age of 29: I work durying the day and study the evening. I procrastinated physics as much as I could, since I was always so scared of it, to the point that I almost did not enroll because of it. Now that I have to study it, I'm so glad that I found your lectures on youtube. Everythingy you explain is crystalline (well maybe not always at first, but after some reasoning it's absolutely obvious), and you're actually making me LOVE physics. Your demonstrations are so clear that I repeat your demonstrations every day so that I may fix them in my head forever (I hope!). I was puzzled when I saw that your videos had almost no comments: however I just found out that it was an entire set of videos uploaded from another user, with very low quality and with very few views. Sorry if I wrote so much, but I just wanted to express my gratitude. I'm quite sure that when I'll get to Electromagnetism I'll be finally able to get it (I had to study it for another exam, but I couldn't really grasp the concepts). In short: thank you so much for your exceptional work and passion, and a big hello from Italy!
Thanks for your kind words. My RU-vid channel has 118,000 subscribers! This channel alone has about 20k viewers every day. There is another channel with my lectures but the video resolutions is not as good as on mine.
Exactly! And I've been following your lectures on THAT channel! And that is why I was so puzzled. When I found out your REAL channel today, I had a huge smile on my face, and I wanted to finally thank you for your job! So Thank you again, and have a wonderful day professor! :)
This is just beautiful. For 49 minutes, the lecture hall was just like an art exhibition. I can't find words to explain how MUCH these lectures have changed my perception of Physics .It really is a dance of equations isn't it? :) I love you Walter Lewin ❤
Waw!!!...! I'm a student from Brazil and what I have to say is simply that your classes are incredible Mr. Lewin, you're a historical man, your work providing free, democratic and global high-quality education in physics will change humanity forever...
37:00 this actually blew my mind off. Now I know how physicists, astronomers and scientists calculate the gravitational pull on one heavenly body. So refreshing and also cool to know that. Thank you Professor Lewin!
Sir, thank you for responding to the comments as you do. For many of us students with similar difficulties and questions, your answers are extremely wonderful and helpful.
I am a masters student in engineering, yet I enjoy binge watching your lectures like a kid who is being introduced to physics the first time. Love you Professor Lewin!
A small boy from a small village in India saw a video on physics by a great teacher Walter Lewin (This has happened 7 years back).. That video inspired him like anything and made him to take masters degree in physics and teach physics.
Thank you very much, Professor Lewin. I have been using these lectures to supplement my online Mechanics class, which has no lecture. I'm very grateful.
Arriving in class 11 I just started hating physics,but after arriving to your channel I started loving physics again.❤️❤️ Thanku sir(ur student from India)
Thank you for uploading these lectures. I'm a physics student myself currently struggling in my first year (various reasons) and these videos really help keep myself in check. Excellent quality.
@@lecturesbywalterlewin.they9259 Lol, well I didn't mean that it is literally me, I meant that it is the same expression on my face when I am in physics because I have found it very hard to understand :) You are a great professor by the way.
Just want to say thanks recently completed a degree in physics and will be going further to get that phd .I watched all your lectures series as I was learning high school and first year university physics and still come back from time to time to watch all the classic experiments and discussions thank you very much for these lectures .
Derivation of the kinematic and force/work/energy equations using calculus is awesome isn't it? You do some (completely legitimate) algebraic magic and these wonderful and profound relationships just seem to fall out as an after-thought! I would have loved to have been there when Messrs Newton, Huygens, Laplace et al were doing this for the first time...
I'm in final year of Mechanical Engineering but I'm still studying your lectures on Physics. This intuitive and simple approach has gripped my mind to your lessons. Thank you so much for sharing these. :)
I remember that my 8th grade science teacher always said that doing something faster won't change the amount of work that you do. Would I be write if I said that he is wrong for the reason of your acceleration would change therefore the force would change and then the work output would change. Also they way he taught us work (hopefully for obvious reasons) was a lot more simple along the lines of pushing an object (the force) some distance. Where you came at it at a whole different standpoint, do you say that he did something wrong with explaining it?
If you lift a mass m from A to B with vertical distance h and you do this with ZERO speed in A and ZERO speed in B, then the work you do is mgh, it's the same no matter how fast you do it.
Professor, can you please tell me where can i find assignments given by you based on these lectures. (your lectures are just amazing. I have never seen such an enthusiastic PHYSICS professor like you so far in my life )
Very Famous lecture of Sir Walter Lewin....Now I got to know why it's famous.... PHYSICS WORKS! AND I AM STILL ALIVE!!!! This gives me Goosebumps sir....Loads of Love
Why at 46:35 the glass was broke? He was also released that bob with 0 speed from that point? Sorry he was actually giving a little pit push which of the cause of breaking the glass.
Hi professor. Many thanks for your videos. I wanted to ask you (minute 40:45 ) why the sign of the "dr" within the integral is not negative, since the force is in the opposite direction ( the force is to go from R to Infinity according to your drawing and the movement is to go from infinity to R) Thank you very much in advance and for all your lessons, they are really useful !
Respected sir . Don't Mind Sir I am from India.I am in class 11 Sir this level of physics you are teaching in college but sir in India this level of physics have been taught to class 11 students . So you should teach more high level of physics ????????????😊
Sir loved your lecture. This concept helped in clearing jee advanced, India's most prestigious high school exam . I wish I will meet you when I will come in MIT for masters. Thank you once again Love from India
In another video, when you were discussing about Simple Harmonic Motion,at the end of that lecture you showed a ball rolling on an arc & it was not following the predictions you had maden earlier. You said that it was not friction but it was due to its rotation, the potential energy was dividing into KE and Rotational Energy. Doesn’t this hold for this model? Why is it following the equations as its not sliding but spinning? (the one shown in this video at 24:14)
@@lecturesbywalterlewin.they9259 Thank you for your reply sir. Made my day! It would be real helpful, where can I get those Bi-weekly problems and answer sheets?
Never thought my fear of physics will be converted to love for physics with just one video ! Teachers who makes physics boring are real criminal ! Thank you sir for making me fall for physics !
The last example of P.E and K.E in this lecture was the example which changed my life totally, Because i saw Pr. Walter Lewin First time in my life on phone while he was demonstrating this phenomenon really Since then my understanding towards world is totally changed 😊. Love you Professor ❤️
Een klassiek vakman zonder tierelantijnen en precies de docent zoals die moet zijn, duidelijk en gedoceerd, afgerond met een aansprekende demonstratie. Bijzonderder hoeft het niet te zijn.
@@lecturesbywalterlewin.they9259 U wilt zeggen, dus best wel bijzonder,.. Wat mij opvalt aan uw colleges is dat de studenten geen vragen stellen of komen met opmerkingen, is dat vanwege de videoopname? Ik was altijd nogal een vragensteller, vandaar
hello sir i am from India and we have IIT exam for enter in IIT college and i used to watch your video because whatever your are teaching that we are learning now in 11th and 12th class but I think you should bring your video in other languages also for us like people
Omg i loveeee this guy, he make me think that not all ppl are bad in this time and his lectures are soooo easy even I (14F) can understand them and love them🖤
h=2.5r for the roller coaster works only in the case of sliding motion, the rolling of the ball takes up part of the initial potential energy and thereby reduces the kinetic energy at the point D for looping the loop
You could make a fun problem out of analyzing the motion of a helicopter during an autorotation. The v-square term really helps in determining where the helicopter ends up.
His students are incredibly lucky. Be able to sit in his class and just learn. Imagine if he had a class in space, in an O’Neill cylinder! That would be literally Disney every day, and you can watch it for free like this! That just tells you being a student is a privilege!
