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.
@@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
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 RUclips 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.
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.
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 !
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.
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 🇮🇳
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
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 RUclips 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! :)
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!
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!
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.😊
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
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...
You are really a life changing person and experience for a student professor. Watching someone teaching for the love of physics in today's world, as of being a student aspiring reasearch, i feel highly privileged and extremely fortunate from the walls of my house to be honoured to study from your lectures, it really makes me feel that my aspirations could come true and soon u will be meeting a young scientist colleague added to your memories!😊❤ Love and high respect from india
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.
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
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.
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...
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)
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!
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.
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?
OMG OMG!!!!! I came here to clear a doubt and ended up watching the whole video.And i had only learnt that roller coaster, vertical circle on paper but that exp.Woahh.. was GREAT. AND at the end risking his life just to prove an eqn. DAMN now i wont forget it. Ohh and Absolutely Magnificent Work done. :):)
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.
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 !
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 )
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.
@@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.
Dear Prof. Lewin, 27:53. Why a must is centripetal acceleration >= g ?? Because I think both point downward ? i.e., g points downward, and centripetal acceleration points inward (which if we are at the top of the loop centripetal acceleration is pointing downward, in the same direction as g). So if both are equal in direction, this will not hold the ball in top of the loop ???
If at the highest point v^2/R=g, then, when the object is there, there will be no force from the track on the object.The net force on the object is then mg provided by gravity (no help is needed from the track). If the speed gets higher, then the track must exert a force downward at the highest point as mg alone is not large enough to keep it going.
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. :)
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 .
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.
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 ????????????😊
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 !
In reference to the experiment starting at 48:00, is another reason why you didn't get hit by the ball because energy cannot be created only converted? So eventually, if you left the ball swinging, it would stop? A bit like perpetual energy? I'm really enjoying your physics lectures, and have been watching them in my spare time. I am planning on rewatching, and taking notes, so I can understand more.
Sir,In example at 5:43 ,the given condition is that Velocity at A=0=Velocity at B,so how does that object can move that height h with zero net force(as Force by F and force by gravity gives zero net force) Please explain it sir Sir,also what does it actually mean when in physics it is said that "an object is displaced "slowly" by some force F"(For example it is used in the definition of electrostatic potential )
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 ❤️
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🖤
Hello professor, At 6:16 you say W_WL = +mgh. I can find that by saying that W_WL + W_grav = 0 thus W_WL = - W_grav = +mgh. However I do not understand how you immediately find that W_WL = +mgh without doing that small calculus. If you lift with a constant force F then the work you do is +Fh. It would mean that F=mg and then the object is not moving. Where am I wrong? Thanks and thank you for your lectures!
>>> W_WL + W_grav = 0 >>>> yes! The work I do is called change in Potential Energy. But if I lift a gallon of water from the floor to the table the net work is zero. the KE on the ground = 0 , KE on the table = 0 thus no net work was done
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
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
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.
:)
@@lecturesbywalterlewin.they9259😊
"Physics works, and I'm still alive."
I was really scared to imagine if the ball had come closure just a slightest even..!🙄😴
👍
@@PrinceKumar-hh6yn then u don't trust physics
@@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
Watching you talking about physics is like listening to mozart.... thank you for your magic.
:)
Dude, I love this guy...he even risks his life to make the concepts clear to his students..one of the best physics professors out there
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 RUclips 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.
24:35 I love when he draws dotted líne and the sound even
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.
+manuel di nucci Thank you! Keep it up!
From egypt big greating❤
Love from india! Big fan of your teaching professor lewin.
Great, thank you
@@lecturesbywalterlewin.they9259 Sir ,I want to know that how you create dotted lines so faster.
@@satyamthakur11a28 practice and experience
@@satyamthakur11a28 jee aspirant?
@@satyamthakur11a28 By holding the chalk perpendicular to the board, not at an angle.
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 !
:)
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
i wonder how far you’ve come by now
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.
you know he's THE ideal teacher when he puts his life on the line. Hats off professor!
I moved to medical studies, and I am still feeling excited when I watch your lectures.
Great Professor. (from Morocco); much Love:)
Best professor I have every seen! thank you very much for allowing us to watch such a informative, dramatic and vivid lecture!
Thank you Mini for your kind words.
Sir Even You Don't how much it is helping Students / aspirants of NEET and JEE.........Love you Physics God
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 🇮🇳
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
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 RUclips 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! :)
:)
❤@@lecturesbywalterlewin.they9259
love the phrase "Physics work"
Sir Walter when are they conferring a Nobel prize for a lifetime dedicated to lectures and making us all love physics? If not given already
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!
:)
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!
Glad you enjoyed it!
The Greatness of this Professor is huge.
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.😊
Did you clear JEE or not? If so, which college and branch?
@@mannmehta24yeah i also want to ask 😂😂
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
Wow, thank you!
@@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
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 ❤
I admire so much about his lecturing. possibly the top is a fantastic use of the blackboard. definitely a lost art nowadays.
2:51 this guy is like "wtf did i just saw"
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...
thanks for your kind words
Big fan from Brazil professor Lewin.💙👍
You are really a life changing person and experience for a student professor.
Watching someone teaching for the love of physics in today's world, as of being a student aspiring reasearch, i feel highly privileged and extremely fortunate from the walls of my house to be honoured to study from your lectures, it really makes me feel that my aspirations could come true and soon u will be meeting a young scientist colleague added to your memories!😊❤
Love and high respect from india
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 haven't seen someone teaching physics in such an amazing way, u r amazing completely amazing
I wish i could meet this man once....love from INDIA...!
Physics is the poem of logic that you are showing me with rhythm. Love from Bangladesh 🇧🇩🇧🇩🇧🇩..... A big fan of you'r.
Sir I am from India..I am a student of class 11 and I just wanted to say these lectures help a lot
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
34:18 Gravity Sucks, bro!
yes it does
I thought I was the only one who laughed at that 😂
Found you recently,and I can proudly say that I'm addicted to your videos .Keep it up Sir :)
That was a phenomenal lecture. Thank you Professor Lewin for teaching physics to the world.
The most knowledgeable and best 49 minutes in my life
'Physics works, and I'm still alive'
Satisfaction line.
sir I am a jee aspirant i have joined a good coaching but your explanations helps the most. you are the best physics teacher
That was the coolest lecture professor.
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.
:)
Teacher you are really amazing. Wounderful💯. I really love that lectures.God bless you😇.
All of you are in for one best teacher, I am from India 🇮🇳🇮🇳🇮🇳🇮🇳🇮🇳.
13:59 ....it moves in a crazy way😁
Lots of love from india we want teachers like you in india .....hats off to you sir..
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...
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)
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!
Big fan sir first time see your video and now i am your fan . Love From India ...
Full Chapter WEP of IIT JEE in one lecture ❤️❤️🔥🔥
Hello
I want to talk with you. Please response.
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.
When you didn't pay attention in Calculus I and have no idea what's going on: 2:51
LMAO was about to comment the same thing
😂😂😂
Yes, it should be the other way: learning calculus along with physics...
That's my approach to life
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)
correct. I made it one of my Bi-weekly Physics Problems
@@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?
@@arafsartistry5421 2 playlists: Bi-weekly Physics problems and Solutions to the Problems
For anyone wondering at 1:44 : dx/dt = v, then multiply by dt to get: dx = v dt
OMG OMG!!!!! I came here to clear a doubt and ended up watching the whole video.And i had only learnt that roller coaster, vertical circle on paper but that exp.Woahh.. was GREAT. AND at the end risking his life just to prove an eqn. DAMN now i wont forget it. Ohh and Absolutely Magnificent Work done. :):)
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.
Surpassing and legendary talent to give fine and sound understanding to the new students of Physics.
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 !
dr is by definition in the direction of increasing r.
I'm here first 🥇 time to watch your video and I'm impressed 🤝.
Love from 🇮🇳
Well explained about work energy theorem Thanks a lot sir
Love from India 🚩🚩
My pleasure
Sir ,You've greatly magnified my passion for physics...Well Wishes from India..👌🏻
Hi Thank you very mush for this great help , why always we put the acceleration is constant
we don't always assume that a is constant.
Since we often deal with gravity, we then always use the constant g=9.8 m.s^2
Fantastic & Phenomanal.
So real and understandable.
Your students are very lucky.
Many thanks for sharing with us.
It's my pleasure
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 )
they are listed below the video thumb nails. Also exams and also solutions
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.
47:48 the look on the guy's face
That's me in physics class lol
@@Rubmybootyandfeedme If that were you, you would be 39 yr old now.
@@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.
Dear Prof. Lewin,
27:53. Why a must is centripetal acceleration >= g ??
Because I think both point downward ? i.e., g points downward, and centripetal acceleration points inward (which if we are at the top of the loop centripetal acceleration is pointing downward, in the same direction as g).
So if both are equal in direction, this will not hold the ball in top of the loop ???
If at the highest point v^2/R=g, then, when the object is there, there will be no force from the track on the object.The net force on the object is then mg provided by gravity (no help is needed from the track). If the speed gets higher, then the track must exert a force downward at the highest point as mg alone is not large enough to keep it going.
Whoa!physics work and I'm still alive,literally killed me lmao
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. :)
:)
Sir why it is said that work energy theorem is the scalar form of Newton's second law of motion?
Work is a scaler and energy is a scalar. The work energy theorem can be derived from Newton;s 2nd.
I am always amazed when I see your lecture, you are great .salute to you for your works
Thank you very much professor, now i can solve each and every problem mention in the assignments.
:)
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 .
+matt champion Matt, you are very welcome!
if only i had had them back in the 90s...
3:53 those dots 😮
What a great piece of teaching!
I'm in the highschool and it was easy to understand because of your lovely teaching
34:18, Gravity sucks....I like that:):)
:)
He ment gravity sucks things
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.
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 ????????????😊
Its basics bro.....
Well i am preparing for JEE
@@Anonymous-lw4nq fayda hota hai bhai sir k videos se?? aur kaun sa channel dekhte ho physics k liye
@NetroHack guys i wanna know where can i get all lectures of prof walter lewin
I am also preparing for JEE
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 !
In reference to the experiment starting at 48:00, is another reason why you didn't get hit by the ball because energy cannot be created only converted? So eventually, if you left the ball swinging, it would stop? A bit like perpetual energy?
I'm really enjoying your physics lectures, and have been watching them in my spare time. I am planning on rewatching, and taking notes, so I can understand more.
Sir,In example at 5:43 ,the given condition is that Velocity at A=0=Velocity at B,so how does that object can move that height h with zero net force(as Force by F and force by gravity gives zero net force)
Please explain it sir
Sir,also what does it actually mean when in physics it is said that "an object is displaced "slowly" by some force F"(For example it is used in the definition of electrostatic potential )
work energy theorem.
Work energy theorem - B is H higher than A. KE at A and at B are zero. Work done by me is +mgH work done by gravity is -mgH. Net work is zero.
Thank you sir for clarification.
Sir I am fan of your teaching style
Sir Walter Lewin
I listen first time your name from Sir Namo Kaul . I am very very thankful
Professor I'm a Commerce student from India.. I just love you
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 ❤️
That's GREAT!!!
Last Moment.. Makes me alive back enough to inspire the love I have been seeking for Physics.
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🖤
Hello professor, At 6:16 you say W_WL = +mgh. I can find that by saying that W_WL + W_grav = 0 thus W_WL = - W_grav = +mgh. However I do not understand how you immediately find that W_WL = +mgh without doing that small calculus. If you lift with a constant force F then the work you do is +Fh. It would mean that F=mg and then the object is not moving. Where am I wrong? Thanks and thank you for your lectures!
>>> W_WL + W_grav = 0 >>>> yes! The work I do is called change in Potential Energy. But if I lift a gallon of water from the floor to the table the net work is zero. the KE on the ground = 0 , KE on the table = 0 thus no net work was done
Alright thank you! My mistake was to say that F is a constant because if it were, the speed at the end would not be zero.
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
Man hasn’t Walter sir retired?
@@Ad-tr9rl yes of course
at 40:40 force done by Walter Lewin and dr are in opposite direction so there should be a minus sign there, kindly shed light on that sir
I finally got it , dr is by definition positive
Great fan of ur teaching sir STUDENT FROM INDIA
I just wanna say that I love you, at the moment you are a God to me.
What a magnificent genius teacher!
Your teaching style is amazing and anybody can understand the actual meaning of physics.
:)
sending love and thanks from India for your great effort.
Hats off to you
Wacthing your lectures is like wacthing the beauty of physics . like richard .p.feynman 's convesation
:)
Watching a video each day makes my life better ❤️🤩
Thank you professor lewin...for making me look the world through a different and fascinating perspective.....!!!