What is Escape Velocity? (Physics)

[@PhysicsMadeEasy]

Hey Physics Lovers, In this video, I use the concepts of energy and gravitational potential energy quite a lot. If you need a little help on these notions, check out these videos : “What is gravitational potential energy?” : kzbin.info/www/bejne/mJKYoHxthrRlmac “What is energy?” : kzbin.info/www/bejne/pZfSnn9npq5mrqs One viewer kindly made me notice a typo at the beginning of the video: I missed the ‘s’ in the word “Understanding” … Apologies for that! If you have any questions, feel free to drop them in the comments! Enjoy the video!

[@bstanis1237]

Thank you so much Dr. Edouard, please, keep going, it is the best channel of physics, it has very good explanation with animation and also English subtitles for us as we are foreign learners. I'm so appreciative and thankful to you :) We are always stay tune for your videos with passion, Best regards with deep respect.

[@PhysicsMadeEasy]

Thank you for your feedback bstanis! And especially for you mentioning the subtitles. I do them manually because I know there are many non-native English speakers viewing my work, and that some do not fully understand my accent. Besides, I do not like KZbin's system of subtitles... I appreciate your words because producing the subtitles is long and soooo boring, but I still do it for you guys!

[@gauravrudramalik5869]

A very nice video, and beautifully explained as always! :) Coming to the answer, the orbit of the moon around the earth would be largely unaffected, even if the earth were to become a black hole. This is because the mass of the earth would remain unchanged and so would the distance between the centre of masses of the earth and moon, and also the energy equation would remain as is 😀

[@PhysicsMadeEasy]

Hi, thanks for the kind words about the video :-) About the little quiz... There would actually be a small difference... think about the motion of the moon today and think about tidal forces...

[@garychen8163]

This is very very helpful! Thank you so much!

[@Asaad-Hamad]

As usual.. Wonderful easy to comprehend explanation 🌷🌷

[@PhysicsMadeEasy]

Thank you so much for your feedback Asaad! :-)

[@ekeys6897]

Loved it too!

[@munchyslime]

This is a gret video. I watched it to the end and learnd so much, edoard :)

[@munchyslime]

Sorry for mispeling ur name im not english

[@PhysicsMadeEasy]

No worries!

[@PhysicsMadeEasy]

Hi Munchyslime, I am glad you enjoyed it! Thank you for your encouragement.

[@manuelsamuel5750]

Hi, great video Could you please make a video elaborating on how current and electricity truly flows. I have always thought of it as water flowing through a pipe but recently came to know it's all electric fields provided by surface charges and the battery that propagate energy. Still finding it hard to wrap my head around it. Would find it helpful if you could provide a deeper dive.

[@PhysicsMadeEasy]

Hi Manuel, I have quite a few videos about this on the channel. These should help you connect the dots: Go the electricity playlist: kzbin.info/aero/PLU0ETLdKNmc5UTL-_71rwUt1uUQra2-eC and watch the 3 first videos in order and then the 5th one. Then, watch the 8th and 9nth one for a more practical approach (with circuits). For a more in depth understanding you need to watch the 4th one after that. I too, when I was a student, have been very confused by the water analogy... so I tend to avoid it when I teach electricity. Only when it comes to discussing flux (like in video 4), then, I can find it useful.

[@unknownuser-hf5jf]

Incredible!!!!

[@PhysicsMadeEasy]

Thank you!

[@Sayan_28]

I love your videos sir. Please keep posting ❤

[@PhysicsMadeEasy]

Hello Praveen, thank you for your encouragement :-)!

[@vijayasaraswathy3894]

Thank you

[@PhysicsMadeEasy]

You are welcome Vijayasara :-)

[@deanchadwick7443]

The moon would surely stay on the same orbital path as the earth has the same mass

[@PhysicsMadeEasy]

Hi Dean, that is the answer that most of us would think of intuitively... But today, the Earth has a volume (which would become very small as a BH), meaning that some tidal forces exist because of the moon. What would happen (or not happen ;-) to the moon if these tidal effects disappeared?

[@fireonusgaming]

Yeah like I know the fact that the moon is moving 3.83cm away from earth every year but I don't understand why because in the chapter of circular motion I studied that radius will increase if the body or object( undergoing circular motion) is accelerated but like how can the moon be accelerated I also know that the drifting of moon is due to water on earth but I don't have a good idea of how that is hapenning

[@Science-d5q]

According to Einstein,, Gravity is not a Force. So F= mg is wrong??

[@PhysicsMadeEasy]

Hello Ishwar, You are right, in general relativity, it is the curvature of space that generates an acceleration. So gravity is not really a force but the curvature of space. Here, in this video, we remain within a Newtonian paradigm to describe what is happening (remaining at the level of high school physics).

[@Science-d5q]

@@PhysicsMadeEasy If curvature of space that generates an acceleration in a body. Then Their must be a Force According to formula F=ma. Then Einstein is wrong

[@Science-d5q]

@@PhysicsMadeEasy If F=mg (weight) is wrong according to Einstein,,,,, then all physics is wrong

[@Science-d5q]

@@PhysicsMadeEasy If F=mg (Weight) is wrong according to Einstein,, then all physics is wrong

[@Science-d5q]

@@PhysicsMadeEasy Please reply sir

[@siddharthakumar4761]

Does bookish learning makes one idot in a true sense? comments your answer

[@PhysicsMadeEasy]

Depends on how you approach the book. It depends also on the book's structure and pedagogy, and how you approach study: If you work on exercises knowing what you are doing, and can succeed at exercises that are a different then the worked examples, then it means that you've got it. If you are just applying formulas hoping it will work out (sometimes it does), then it is a path for pain.

[@siddharthakumar4761]

Thank you for the answer. I have one question more for you. I have heard-​If you are able to connect what you are reading with your life then only you are really studying, otherwise you are not really studying. So how to do this type of studying @@PhysicsMadeEasy

[@PhysicsMadeEasy]

@@siddharthakumar4761 It’s an interesting question. Well, I my first thought is that whatever you study, it may relate to your life in some way or another, (or not at all): Take studying Chinese literature as a minor while you are a Mexican national studying science… The study of Chinese Literature doesn’t seem like it could relate to you. But who knows... One day you might meet a Chinese person, and because of the understanding this study gave you about Chinese culture, it may create a connection between you and this person. And then, anything can happen… So here it could relate. So what to study ? Study what you enjoy… Because what you study will influence who you are, and guide your steps in who you want to become. So in my opinion, the real study is the one you enjoy.

[@siddharthakumar4761]

Thank you for your reply. I have one question more for you I have heard-one should not follow any country education system. Is it right?​@@PhysicsMadeEasy

[@PhysicsMadeEasy]

Well, it depends. Some national high school programs are quite elitist, meaning more focused on selecting students then teaching them. Others have an approach closer to the original goal by providing a broad view of the subject while still having the pedagogy so that student end up with solid fundations. If you have a choice of what program to pick, it could be a useful investment to spend some time checking what is taught, consult the relevant text books, and look for feedback from past students. From there, you can improve your chances in finding the program that would actually suit your needs. To be truthful, my favorite for physics is a private one (the IB). Maybe because they're here to make money, they focus on the pedagogical quality of the content, giving them a competitive edge...

[@codaroma]

the field has infinite reach

[@PhysicsMadeEasy]

Absolutely, but after a certain distance it is so small it can be neglected: Note that when I discuss case II and Case III, beyond the dashed line around the planet, I didn't write g = 0 but g is nearly zero ;-). Still the GPE has a finite value, so another value, like a KE can be bigger... That's why I chose to discuss escape velocity using energy concepts instead of velocities and distances.

[@frowningJoker]

I was gonna watch the whole video, but at the beginning you missed an "s" in the word "understanding". There are millions of "content creators" on youtube, and if you want to stand out, and pull in more viewers and subscribers, show us that you take it seriously and at least do a spell check before posting anything. I hope that helps.

[@PhysicsMadeEasy]

@@frowningJoker that hit hard, because I do take it seriously. Thanks for letting me know. Imho, you should not stop at that: your statistics might be a little poor for an opinion. mistakes can happen when you are alone doing everything. I do understand your point though and thank you for sharing it with me: unfortunately, I do not think I have the resources to avoid these kinds of mistakes, or maybe i need to simplify the graphical format of the videos, so I can focus more on the triple checking of the production. If you like this topic, you should still check the video despite the initial typo.

[@charlesreny9789]

There are millions of content creators, but only a few dozen discuss physics. People come here to understand concepts. If you find spell checking important, I hope you'll find the essence of this video even more so.