What is Escape Velocity? | Physics | Extraclass.com

[@dayanithi9359]

Discussing the competitive exams question in the lecture is sounds like adding spices to u r dish🥰🥰🥰🥰

[@Extraclass]

That's the idea finally someone understood it

[@TheNoiseySpectator]

@@Extraclass So, following a food recipe is the same as doing a physics formula. (Except for doing exponents and roots.) That may be a successful approach to teaching grade school children to do physics calculations. 😏

[@jcdevelopment696]

Literally learned in five minutes what my physics teacher's failed to teach me for a semester

[@AngusMcAlister14]

A semester? What hahaha.

[@ALEX-gr7dx]

Liar. It takes a period for any teacher. You were irresponsible and not listening

[@monjurulislam2132]

same here

[@novablast1695]

its your problem and not the proffessor

[@iamcase1245]

Wrong. He could be telling the truth. I've seen professors teach different calculus subjects so badly entire classes can't understand. @@novablast1695

[@poojapandey9994]

Excellent thanks for the clear concept👍👌

[@Extraclass]

Thanks

[@faiyzaaijaz]

Thanku so much sir .,really got help stay blessed sir...

[@ayushi3361]

This video make this topic more INTERESTING🦖🔥

[@physicsandcomputerinformat3104]

Nice

[@tishakhalkho4172]

I am the first subscriber of your channel As it clears all my doubt 😊

[@vlp7]

Wow! How could you explain this smoothly and easily. Thanks a lot!!❤️

[@random-e5c]

By his mouth

[@vlp7]

@@random-e5c omg thankyou so much for telling me this very important thing! I'll learn it by heart!😊

[@NitishYadav-wh6sb]

Hiii

[@happysoul7304]

Simple and clean visual..tq so much ❤️

[@republicofbikers9820]

Very simple explanation I love the way

[@lanang4811]

Thank you ❤

[@adityaadit2004]

Can you explain why did you compare the two equations, GPE and KE in the first place?

[@rscoops3986]

Kinetic energy has to be greater than or equal to the potential energy in order to overcome the Earth's gravity and escape it's sphere of gravitational influence.

[@pulse9749]

Nice explanation .

[@Extraclass]

Thanks

[@juhiverma5062]

Nice explanation

[@ablene_teklie]

The explanation is easy but most of the questions raised based on this topic are really hard.

[@muhammadizhar2985]

Superb videos of ur channel sir👍👍👍

[@Extraclass]

Thanks

[@colonyofweirdos182]

the definition was cool. i'm impressed..

[@JacintoPintoAquinoRêgo94]

Is the scape velocity the initial velocity or a constant velocity??

[@ExamPass999]

Thank you sir I understood nicely

[@dencybk]

Potential energy derivation: P.E measured from earths surface is P.E= mgh. Newtons Gravitational force,F(i.e mg)= GMm/r2. Hence g=GM/r2). P.E is hence = m* GM/r2. r= GMm/r

[@santoshwithpencil]

Wow! Nice explanation.

[@Extraclass]

Glad you liked it!

[@Ahmad-wv2yz]

what a nice explanation.

[@Extraclass]

Thanks

[@akoterryeyong8259]

Thank you so much ❤❤

[@aditimore5332]

Nice explanation 😊👌👌👌

[@mohamedjamaludeen7214]

Impressive 👏👏👏

[@Extraclass]

Thanks

[@sheikhayman6063]

Crystal clear 👌

[@filmy5895]

Underrated 🖤

[@Extraclass]

Thanks

[@jaat79420]

Nice 👍

[@supriyode8716]

how is the example of cannon ball and bullet similar to rocket ? The rocket has an engine that can actively apply force whereas the projectile like bodies cannot. Why does the rocket need to be limited by escape velocity?

[@willoughbykrenzteinburg]

It doesn't. The definition of escape velocity is not the velocity needed to escape; it's the INSTANTANEOUS velocity needed to escape. If you have a rocket with unlimited fuel, you could escape Earth going 1 mph the entire time. You could theoretically climb a really tall ladder and escape Earth's influence. Escape velocity is the velocity needed INSTANTANEOUSLY at some distance from Earth that - if given no more power/thrust/work/ etc., would never return to Earth. When you read about the parameters of a planet, one of those parameters will be "escape velocity". This figure is ALWAYS from the surface of that planet/moon/astronomical body. This does NOT mean you have to reach that speed to escape. It's the *_instantaneous_* velocity needed to escape from that distance from that body. Escape velocity decreases the farther you get away from a body. You could theoretically escape at any speed - - given you have enough fuel to continue burning.

[@rockwithyou2006]

@@willoughbykrenzteinburg you are right. I would use the word "initial velocity" instead of saying instantaneous velocity. Thanks for your comment. The videos around this topic on youtube really blew my mind about how wrong people are the positive comments they are getting. Im glad someone like you pointed out.

[@ritparent7239]

@@willoughbykrenzteinburg So...escape velocity is really the initial speed that is attained at the surface of a planet after a relatively short burn of accelerant. Much like an object that is thrown...once it leaves the hand/arm, it immediately begins to slow down. Or a bullet that leaves a gun...the muzzle velocity is the fastest it will ever travel. After that, friction continually slows it and there is no longer any force propelling it forward other than its initial inertia. Correct?

[@vamshimusic8623]

Xlent explanation it's aa very easy to understand

[@clintton888888]

My question is , at what distance from the surface of the earth that the rocket need to reach this velocity ? eg. what is if I keep accelerating till I reach 1/2 way moon but my velocity not reaching the escape velocity and I switch off my rocket , will the rocket escape the earth?

[@Extraclass]

Ok

[@abhishektyagi4047]

flyingbeast has the same question

[@johnrogan9420]

There is a point in space...800 million miles out where the gravity would fall the object to a distant place and not back to Earth.

[@clintton888888]

the question confuse me. it shd be the gravitation force on the bullet as it reaches its max height. The acceleration of bullet at the max height shd be zero as the bullet is not accelerating not decelerating at the max height.

[@Extraclass]

Ok

[@Hariskhan-z5t]

Sir ap please is topic par aik lecture banayai 'Motion of System of Particles and Extended Rigid Bodies'

[@blastofclass-forsecondryle9027]

Wow its great sir

[@Extraclass]

Thanks

[@vaibhavisaxena4535]

Excellent ❤️❤️

[@BenjAtheism]

how can you differentiate escape velocity and just because the object reach outer space? we float in outer space right?

[@willoughbykrenzteinburg]

Many people don't understand why people float in space. It's not some magical thing. You float because you are in free fall. Things in Earth orbit are VERY MUCH under the influence of Earth's gravity. It's just that they are moving so fast SIDEWAYS - - as in - - across the surface of the Earth, that as they FALL, they are moving so fast that the Earth's curvature continually curves away from them, so they more or less stay the same distance from Earth; however, they are very much in free fall. This "floating" is just a consequence of free fall; not because they have escaped Earth's gravity. There used to be a ride at my local Six Flags. It was a free fall drop. It only lasted 2-3 seconds, but we used to put pennies on our knees, and when the ride dropped, for those 2-3 seconds, the penny would just seem to float. That's what happens in free fall. It's just that things like the International Space Station are in a constant state of free fall - - that's essentially what an orbit is. They are just moving so fast sideways that they never get closer to Earth - because the Earth continually curves away as they fall because they are moving so fast sideways. That's why things "float" on the space station. Everything is in free fall. The station, the astronauts, any materials they have up there. So from that perspective, things all seem to "float". They aren't free from gravity; they are very much under the influence of gravity. Gravity is what is keeping them in orbit. They haven't escaped gravity. But your fundamental question - - and Albert Einstein noted this in his General Theory of Relativity. There is no difference between being in free fall (as in orbit) and just free floating in space with no gravity acting on you whatsoever. They are identical states - - which is what led him to conclude that gravity was not a force, but a curvature of space. It gets crazy, but that's the gist. Escape velocity is not needed to get to space. Escape velocity is needed to literally get so far away from some astronomical body that its gravity no longer has an affect on you. Nothing in Earth orbit has reached escape velocity. We HAVE sent probes that have reached escape velocity (i.e. Voyagers).

[@michaelsobolewski401]

is there maybe a hover point

[@Ahmad-wv2yz]

plz make a video on momentum

[@Extraclass]

Sure

[@zwei8481]

thank you sir

[@AbdullahKhan-pk9hg]

well explained

[@vasilisgreen]

How is a shot with an initial speed and no propulsion applied beyond the barrel related to a rocket with a constant propulsion and a constantly reducing mass=>constantly increasing acceleration? The shot loses speed due to gravity but the rocket has a force of propulsion. How does that work?

[@laldintluangachhangte3061]

This is not a super advanced explanation,

[@MuhammadUmairShaykh]

Excellent

[@RashmiSingh-wb6vp]

Brilliant explanation is this a video course if it is than I want to purchase it. I have joined many coaching institutions but understanding nothing or maximum 30% there but this video cleared it instantly

[@muhammadshahrukh8740]

How you compared both equations?

[@Extraclass]

Check video

[@dhruvsingh7621]

@@Extraclass its just like "Sir, i am not getting the question!!" And his reply is "Read the question carefully"

[@mischatucker6088]

How does this relate to rockets? They are not fired out of a cannon. They use thrust throughout the entire flight. This mean they could potentially escape a planets gravity at any speed the enough fuel correct?

[@johnrogan9420]

Fuel...bingo..werner von Braun calculated 3 rockets the size of the Empire State Building filled with rocket fuel would be needed to reach the moon.

[@johnrogan9420]

Slowing a rocket 🚀ship down requires even more fuel than getting it to Mach 34 escape velocity.

[@johnrogan9420]

Good take.

[@ritparent7239]

@@johnrogan9420 You mention Mach 34. Is that the "escape velocity" for Earth? A bullet has no other force propelling it forward other than its inertia at the time it leaves the muzzle of the gun, so...a bullet would need to have a muzzle velocity of 34 times the speed of sound to escape Earth?

[@musikaaffection8570]

Nice ✌️🥰✨

[@danyalmughal4871]

Can i get the powerpoint file for above animation???

[@kanwarjitsheenu13]

R remains Constant or varies ??

[@OPTIMUS-l7y]

Can you tell how you make this kind of animated video please 😢

[@michaelsobolewski401]

what if you are going through the exosphere at 100/m/sec with unlimited thrust?

[@aminakhaled2127]

Thank you

[@Extraclass]

Welcome

[@Extraclass]

Share this with other

[@lakshana4744]

Nice video 👍🏻 and I am a new subscriber for your channel

[@Extraclass]

Thanks

[@brendanfan3245]

Why 1/2 mv2 = - GMm/Re? and why there is a negative? Because 1/2 mv2- 0 = - GMm/R2- (- GMm/RE), Replace R2 with infinity, then you have V escape, the formula you use is not right.

[@ihadto6127]

Why did you equate kinetic energy and potential energy while deriving escape velocity? Can anyone say me please!

[@BOY-gr6dr]

in order to get value of escape velocity which is ve2

[@chelseabibek3331]

Cool one

[@launch4]

From my limited understanding escape velocity is basically a measurement of how strong a body's gravitational force is by measuring the minimum initial velocity needed to balance out the ever decreasing pull of it's gravity well. Other than that however I question it's usefulness in real world applications. Space rockets don't immediately leave the ground at escape velocity, they accelerate gradually, plus there is aerodynamic drag to account for, plus the fact that you're not getting into orbit by going straight up.

[@balijosu]

Something that's in orbit hasn't reached escape velocity.

[@rockwithyou2006]

yes, this video is absolute BS. I am in my mid 30s and studied physics years ago and can't help but comment here to make things clear. You could theoretically go at a constant speed of lets say 1m/s upward and still escape earth (ofcourse you need propulsion to achieve a constant 1m/s speed upward to counter earths gravity) Escape velocity is the minimum initial velocity needed by an object with respect to a mass (like planet earth) without further acceleration for it to never come back to that mass (earth) again. which means if you shoot a cannon at 11.2 kms per sec from earth it will escape the earths gravity but it will ofcourse slow down as it goes up. The cannon ball is not going to travel at that speed constantly as it goes up, it will slow down and almost achieve a velocity of 0 wrt earth at the point where it escapes earth (if it was shot at 11kms/s). A rocket (which is propelled by burning fuel) however, does not need to even achieve this speed. A rocket is capable of propelling itself and can theoretically even go at lets say 1 m/s in order to escape earths gravity, as long as it can get that propulsion for enough amount of time.

[@aidanvega9778]

anyone know how these graphics are made?

[@Extraclass]

Our illustrators use various tools to create these.. you can find relevant information on people teaching graphics and animations

[@farhadiba5956]

Q. If the radius of earth is 6.38× 10^6 m and the acceleration due to gravity is 9.8m/s^-2 . calculate the escape velocity from the earth's surface?

[@divyam.arya864]

11.2 km/s

[@balijosu]

(Assuming no atmosphere)

[@magicpipe5457]

I'm missing something here. If we launch a rocket which have a propulsion system (and not a bullet or a rock) in a vertical trajectory, cant it escape at any speed we want? The rocket just need enough fuel to maintain that speed for the required time to leave the orbit.

[@brandonb7496]

My thoughts exactly. Had the same question.

[@bikeradam]

Maybe rockets don't work in space?

[@rockwithyou2006]

yes you are right. This video is BS Escape velocity is the minimum initial velocity needed by an object with respect to a mass (like planet earth) without further acceleration for it to never come back to that mass (earth) again. which means if you shoot a cannon at 11.2 kms per sec from earth it will escape the earths gravity but it will ofcourse slow down as it goes up. The cannon ball is not going to travel at that speed constantly as it goes up, it will slow down and almost achieve a velocity of 0 wrt earth at the point where it escapes earth. A rocket (which is propelled by burning fuel) however, does not need to even achieve this speed. A rocket is capable of propelling itself and can theoretically even go at lets say 1 m/s in order to escape earths gravity, as long as it can get that propulsion for enough amount of time.

[@ritparent7239]

@@rockwithyou2006 So...escape velocity is really the initial speed that is attained at the surface of a planet after a relatively short burn of accelerant. Much like an object that is thrown...once it leaves the hand/arm, it immediately begins to slow down. Or a bullet that leaves a gun...the muzzle velocity is the fastest it will ever travel. After that, friction continually slows it and there is no longer any force propelling it forward other than its initial inertia. Correct? So the term should really be "initial blast velocity to escape"...right?

[@aminaaslam8069]

Thank u...

[@ganant23]

I cracked jee in 2014, And man I can still solve this question in 2021 hahaha.. Classical physics is fun

[@kxromi_chxn]

hey which iit r u innn???

[@ganant23]

From IIT Varanasi

[@kxromi_chxn]

@@ganant23 damm icc

[@ganant23]

@@kxromi_chxn yes

[@Ridham_257]

Can u guide.? ​@@ganant23

[@TheNoiseySpectator]

I was more hoping to learn what the value of Ve actually _is,_ but Okay. Noteworthy is that this shows if you fire a bullet straight up, it stops and falls back down, and then hits the ground with as much force as when it was shot out of the gun barrel. So, it is just as deadly if it hits someone on the way back down, as if they were shot a point blank range. ☹️

[@ElectricGun100]

What goes up must come down, mostly

[@Extraclass]

Thanks

[@pranavswarupi5235]

What abt that negative sign ?

[@chris4814b]

It sounds like this is assuming a projectile without it's own propulsion

[@timholstpetersen79]

This is simply not true for rockets that continually burn fuel and have a constant force driving them away from the planet. For objects fired by something like a cannon, yes! They are not propelled... meaning they have no further force propelling them away from the planet after they exit the cannon. The "Escape Velocity" is completely true for those... but for rockets it is completely different. In fact... a rocket could leave Earths gravity a one mile an hour (or less) given it had enough fuel. While practically infeasible, it _is_ theoretically possible. Think about e.g. the F-35 or Harrier jets. They can hover, or rise slowly. Given enough fuel... say like a very slow moving rocket.... or just a very small (and very efficient) rocket, they coul leave Earths orbit at a very steady slow pace.

[@delayedcreator4783]

exactly what i'm thinking. if an object is moving upwards with a constant speed of 500m/s it will be able to escape earth gravity right?

[@kajalkumari9869]

Sir ,escape velocity depends on

[@emc2501]

lots of backgroung music is there...but video was good.

[@childmolestr]

kaynetic ⚡ energy

[@kanwarjitsheenu13]

Why it is not possible for any rocket which is constantly accelerating and have speed of 500 km/ hour to cross the earth's orbit ??

[@Sahl0]

what is capital G? in equation?

[@BINOD12345_--...]

6.67 * 10-¹¹

[@escapefelicity2913]

Get rid of the background noise

[@Schemez-16vhiphopbeatz]

So if we flew fast enough straight we could fly over the curve..

[@brandonb7496]

If your energy source was sufficient, why couldn't a ship just travel at any speed upward. ?

[@snehamishra7427]

Umm... I was unable to understand from a part😭 as I'm just in class 8! But I wanna learn as much as I can😭😭

[@kashishyadav2712]

Sir I have a question Does the sun have its gravitational force? If it has so it's very big than the planets so why does it not attract the planets towards it Actually I am not having so much confidence to ask this question to my teacher

[@someonealone708]

Yes sun has it's gravitational force .... Due to it's gravitational force all the planets are revolving in a fixing orbit and in a proper order .

[@vipsaju]

You can't control a rocket with bullet. Rocket has propulsion and bullet doesn't have. So escape velocity is applicable for only projectiles.

[@willoughbykrenzteinburg]

This is not true. Escape velocity is the instantaneous velocity needed to escape the gravitational field of an object. The fact that you are under propulsion is irrelevant. If you shoot a rocket straight up and give it enough propulsion to travel 1 mph the entire way up. It keeps burning and burning and burning. Once it reaches a point where the escape velocity is 1 mph, you can shut down the engines, and you'll never come back.

[@rockwithyou2006]

@@willoughbykrenzteinburg vipsaju is saying the same thing as you. You both are saying the same thing. And you both are right. BTW he meant to say "compare" instead of "control"

[@willoughbykrenzteinburg]

@@rockwithyou2006 He is not saying the same thing. He is saying that escape velocity doesn't apply to something under power - and this is categorically false.

[@lwm-laughwithmemes2006]

🤩

[@muhammadusama3870]

Music very loudly. No anything understands ...

[@Extraclass]

Okay

[@kirkyi6412]

would it not be simpler if ve is greater than gravity of the planet?

[@alisa_UA_]

Backgound music is super annoying and distracting.

[@saleemullakhasim8365]

Gentlemen, you have not bothered to disclose the true value of ESCAPE VELOCITY As to how much it is in kilometer/second. Without the value a.person can't imagine.

[@khajapathan8677]

🇮🇳 Indians - Like ♥️ 🙏 Other Country - Reply 🗯

[@monika_gurjar3]

Please remove background music 😩🙏

[@bobscott117]

It's not escaping the earth's gravity it's just fast enough to fall around the the earth. It's called orbit. You can't escape earth's gravity ever in our solar system

[@willoughbykrenzteinburg]

you are vastly misunderstanding the difference between orbit and escaping.

[@bobscott117]

@@willoughbykrenzteinburg you can't escape the earth's gravity! You are poorly mistaking

[@atomicdmt8763]

i dont get it............a rocket is not a bullet................ seems like a poor example.

[@janchan2258]

turn off music plss

[@idonaveh5343]

Nope. Didn’t get any of that

[@sahilkoreca8536]

vip

[@willieevans6586]

How can a hunk of metal leave the atmosphere and the gas doesn't

[@xela79]

Bro, are you being serious🤨?

[@willieevans6586]

@@xela79 serious enough not to believe what I'm told by Masons I'm not that dude that just believes what I'm told but you can enjoy that life though

[@balijosu]

Fuel.

[@willieevans6586]

@@balijosu nothing

[@balijosu]

@@willieevans6586 Yet somehow we're sending probes out into the solar system... funny how that works.

[@dhritikrishnakamila3864]

Sorry sir..but rocket never goes with even half of the escape velocity

[@jayyt9820]

cause bro its continously accelerating

[@davidkennerly]

The music is annoying as hell!

[@FFWorldHD]

Bgm itni irritating hai

[@pac613]

That rocket had to crash in Africa of all places ,Africa can’t even get a break damn

[@oq17]

Rockets aren’t fired from canons - they have propulsion systems , so in theory they can escape at any velocity . Why not explain it not from that context . I’m sure there is still relevance , but the answer is more nuanced . I still don’t get it .

[@Extraclass]

Agreed, the answer is a bit more nuanced. When you fire something from a canon or with a propulsion system, whether something will escape earth will depend on the net force acting on the body due its motion. On getting fired from a canon, the only force acting is gravity while in propulsion system there are upward thrust and gravity both acting. Net of these forces will determine if the body will escape or not.

[@neenaparikh5252]

too much music i cant focus wtf

[@Extraclass]

Okay

[@boptah7489]

" Escape velocity" is absolute physics nonsense. You cannot escape gravity. Even if you use a continuously applied force for ever. you will still be influenced by gravity.

[@balijosu]

Gravity will still be pulling you back, but if you've exceeded escape velocity, your velocity will asymptotically decrease to a positive value.

[@boptah7489]

@@balijosu There is no such thing as 'escape velocity'. You can never escape Earths gravity. It extends to infinity. and while you are not accelerating towards the Earth, you are resisting gravity and so are losing energy. .

[@balijosu]

@@boptah7489 While the gravitational field extends to infinity, the amount of energy lost diminishes asymptotically. The knowledge you're looking for is just a Google search away...

[@boptah7489]

@@balijosu unless the object is being propelled by continuous force , then it will be depleted by gravity, Gravity is a continuous force. ie. a mass with momentum will always lose against gravity. Google is a very poor source of facts....avoid.

[@balijosu]

@@boptah7489 I recommend you talk to some physicists. Your intuitive notions might seem reasonable, but they're wrong.

[@johnrogan9420]

Jeff Bezos can achieve escape velocity with Mach 3...1800 mph...NASA needed 25200mph to do the same thing!

[@fourlegged_chicken]

source?

[@sH-ed5yf]

Nope He didnt left orbit. He only reached about a hundred km.

[@robinmeade7573]

This stupid music is unfit of this video. Am I watching some sort of infomercial?

[@josephdennie6503]

What an idiotic explanation of escape velocity that doesn't show the true value

[@Falaknaaz-r9n]

nice explanation