Elevator Thought Experiment | Genius 

@@swaminathan_r1 no, but every scientist needs to start with a hypothesis.

Keep in mind, thought experiments that is consistent with the mathematical modeling of physics that he understood well beforehand. Otherwise he would imagine lots of things in the wrong way.

Cause it's destiny more than that curiosity is the fundamentals

@@princestevenii.772 true enough

That’s not how physics works. It’s mostly math.

Hahaha maybe that's why

😂😂😂

Einstein just imagined the scenery

@@notcool4314 Exactly, no lift falls free LOL

Ok

😂😂😂😂

lol

Me: *wut*

Noice!

HAHAHAHA

hahhaha

HAAAHAHAHAHAHAHAH SO FUNNY! because time is stubborn illusion

is that an actual quote from Einstein? Cuz that is bs! you need something to build on and the knowledge you acquired helps. Stupid!

he didn't say "knowledge is unimportant"! Plus, from what I remember, the quote ended with: "because knowledge has its limits...". It explains the relevance of his thought experiments ("Gedankenexperiment"), he predicted results by pure imagination that we could just proof and really know nowadays!

Knowledge is great and imagination is also great , but if someone had imagination + knowledge = creativity, ambition, genius, and greatness. Knowledge is tree and the imagination its leaves, knowledge without imagination = a dead tree.

Beautifully put with the tree metaphor. However, someone can't have greatness. that's a trait you can't have when your born. It's given to you, after you earn it

Hassan Ihssan well i have a bright imagination

Adarsh Kumar Edison just care about money.

You can't invent something from nature - gravity, nor can you manufacture some gravity and sell in a market :)

Justin Tesla Chan That means you didn't understand General Theory of Relativity. With Elevator thought experiment, he showed how one can switch on and off gravity artificially. We do that all the time in space station with circular motion.

what do you mean switch of on and off ? Actually, in relativity language, the space station isn't moving "with a circular motion". It is moving in a straight line in curved space/time. If it was circular motion there would be centrifugal force felt by people on board as a force away from the center. A ball being spun on a string is moving in a circular motion and you have to hold on (apply a force, an acceleration) to it to keep it from heading off in a straight line. That is totally different than a body in orbit around a body of a larger mass. The space station and the moon are falling (accelerating at 1 g) into a gravity well. On the space station it does not feel like you're moving in a circle. If the space station was moving in free space a light year away from our solar system it would feel no different on board. It would be a body moving in a straight line in uncurved space/time. That is the same as moving in a straight line in curved space/time.

👌👌

No one reply to this so i did

@@justignoremycomments716 and that i ignored.

@Donald Trump bills and twitter

and then explain to yourself how they would be possible

Ok

True, sometimes i feel stupid but when you find the answer in your own way with applied mathematics, you will feel how happy it is. It turned me from feeling stupid into curiosity.

True

R-mg= ma and mg- R= ma this is followed in elevator similar concepts that in pulling a roller is very easy as compared to push it reaction force supports in this query..

Technically relativity says that the only acceleration is from the floor. You're being accelerated constantly by the normal force keeping you up. The geodesic for an object at our speed and position relative to the earth is inward. When you free fall, you're finally just moving in a 'straight' line in spacetime. Our planet, meanwhile, is following the same 'straight line' in space that's curved by the sun such that the straight line maintains a mostly constant distance to the sun. Gravity is not a force on an object, but a distortion of spacetime. This also explains why quantum mechanics is failing to find it, since they're mostly ignoring Relativity and looking for a force-carrying particle.

@@tristanridley1601 they're not ignoring relativity. They're using the concepts from relativity and trying to quantize it like the path integral formulation using a modified action from GR but there are a lot of problems with these theories The thing is that mass and energy cause this distortion in spacetime but they're best described by quantum mechanics at a small scale so there must be some connection of gravity with it too If they do find a theory using a force carrying particle, it should produce einstein's equations in the classical limit

Geni-us yeah well after* i don't know if there is smth else btw i'm not american and in my contry English is actually our third language

Geni-us moi aussi je parle français c'est en fait notre 2eme langue , tu sais je suis du Maroc ce qui fait que l'arabe is our real language btw again i have a serious problem which mixing languages i can start talking arabic puis français and finishing with english words so ...

which is *

They must be commerce students

@@unknownguy8614 That sentiment is a sheer disrespect for students who pursue commerce, they do value innovation and imagination.

John Wheeler's quote is hard to beat.

How do spacetime tell matters how to move please explain im curious

oZzIbRiDgE GaMiNg I'll try explaining it with a E.g. Sun is a heavy mass which curves the space time around it... This curved spacetime around the sun dictates how matter surrounding it like planets move

Dhananjay Nanaware awsm pllz explain further

oZzIbRiDgE GaMiNg imagine space with no mass in it. This has a net called spacetime. It is perfectly straight until there is mass. Mass warps the spacetime around the mass making it curve. Mass will always follow spacetime so if something passes by it will move along the curve towards the other mass. This is what we call gravity.

ok

He is correct.

U are correct...i was also feeling same ,how acceleration and gravity becomes same..how he deduced that from that experiment is not explained properly 🙄

Yes, thank you for emphasizing this.

he imagine that elevator located in outer space

no u

We STILL don't understand. We are beginning , but not yet starting, to understand knowledge. We are about to scratch the surface . . .

# shdow haha

@studyxgene See it at 1:57.

Indeed the light spectrum, technically perhaps

@@fannypack7705 kya gaali deta hai

You just want to sound smart dont you?

It's a TV show. It's called "Genius Einstein".

nope rather GENIUS = ALBERT EINSTEIN

Isaac Newton =god of physics

@@harshitagrawal9357 nope. I think you really don't know real Geniuses... S. Ramanujan and Shakuntla devi.. ❤️

What about galileo?

Haddd hee yaar comparision karnee kee adat kahi nhi jaegi ham indians kii😂😂

and here you are bragging about his humility...if he was humble he would completely despise you...Indians just want to brag everywhere...

Ramanujan was not a scientist. He was a mathematician.

Non sense, u cannot determine everything through experiments

Real genius, can do experiments in their mind itself, which is more fantastic!

The force on the elevator has to be (m_elevator + m_you) * g. The force the elevator on you would be m_you * g. Not sure what your problem is here.

That was explained by Newton tbh

@@jaydeepgamit8506 😊

Possible.

The equivalence principle states that it is locally impossible to determine if one is accelerated or in a gravitational field. So if you are inside the elevator you won't know what is accelerating you.

the thing is the elevator and einstein are both accelerating at the same rate, that is "g" so if everything which is accelerating at the same rate as you then you would feel as if you were in a inertial frame

@@theboiyoulove5124If you are accelerating, you would not feel as if you are in an inertial frame, even if things around you are accelerating at the same rate because there would be an inertial force on you

by rate, he was referring to gravity being the only force acting on them... other than mass of course I would presume

Wait why wouldn't it be the same velocity ? Gravity accelerates everything ( no matter what their mass ) is at -9.8ms2 ... The force that each object would apply upon contact to the ground would be different though

« Exactly »

If time-space was one-dimensional.

Can you tell me the name of this movie

Genius by national geography

It's could be for some but not for most

U😂😂😂😂😂

Einstein brain is not hardwired for emotions

Kota Dagnino That’s not what this video is about, it’s dumbed down for a layman audience in a sense. Acceleration and gravity aren’t exactly the same thing. When einstein is saying that in this video, he’s talking about the elevator thought experiment where there are no forces acting on him, but it appears like there are. He’s saying that gravity is not a force like newton thought. He’s saying the elevator thought experiment where there are no forces is the same as gravity in real life, in the way that neither actually have any forces. This video is about something called the equivalence principle. Using this thought experiment, einstein realised that the gravitational “force” we see on objects is actually inertial motion. In other words, by showing that the two situations were equivalent, einstein showed that there was actually no gravitational force acting on objects. Inertial motion described by Newton was objects travelling in a straight line at a constant speed. This is newton’s law that states “an object in motion will continue in motion unless acted upon by a force”. Einstein however, stated that Newton’s idea of inertial motion was wrong. Einstein believed that inertial objects don’t NECESSARILY travel in a straight line at a constant speed. Rather, he believed that inertial objects travelled along what is called “Geodesics” in spacetime. “Geodesics” are the shortest paths in space time. Think of space time as being this one big x, y, z, and time grid. The technical term for this spacetime is called a “manifold” but that’s not really important. So einstein said that inertial objects travelled along the shortest paths on the spacetime grid. In a flat spacetime, the shortest path is just going to be a straight line at a constant speed. However, Einstein believe the presence of energy (and more specifically mass) CURVED part of the spacetime grid. In a CURVED spacetime, the shortest path is not a straight line, but a curved one. Think of drawing the shortest line on the surface of a ball. Obviously, the shortest path will not be straight since you’re drawing it on a curved surface. It just so happens that inertial objects switching to this new curved, shortest path on the curved spacetime will cause them to “accelerate”, but not due to any force. Rather, it just appears like that, even though the objects are actually inertial. EDIT: Just remembered that in the video there are forces acting on einstein. A better example of the thought experiment is where the elevator is a box moving upwards in space where there are no forces. Still, the thought experiment in the video is just a simple one used to show the equivalence of inertial movement of objects and gravity.

Exactly.

It took 9 years of thinking about Relativity for him to come up with this idea.

It was simple like he said, and now its easy to connect the dots, but he was the first to actually do it.

It's a series, and it's not available on DVD. I recommend Barefoot Gen. It's a movie about something Albert Einstein helped to make possible, and it's available on DVD. I hope you enjoy it.

No, gravity would still be there. It is by virtue of the Earth's mass, which bends spacetime, that gravity, or a gravitational field, exists. The bending of spacetime around it cause anything that gets close enough to the Earth to experience an acceleration toward it. It's misleading when physicists say gravity "disappears," in fact it doesn't. It's more accurate to just say you don't "feel" it, but gravity is still very much there. If the Earth had no mass-energy, THEN there wouldn't be any gravity because the space around it would not be curving.

@@josecasillas4081 If Earth have no mass and energy, would there even have an Earth? It would be "pff" and gone. Wasn't it?

Danial3W he doesn't talk like him

This is a movie

Correct: Mathematics cannot explain the probability and uncertainty principles of quantum-mechanics. Nor can it explain quantum entanglement. And yet physical and observational experiment can prove logic and reasoning despite the mathematics.

Shane Williams not