What Happens If You Fall Through The Center Of The Earth?

[@DebunkedOfficial]

What's The LARGEST STRUCTURE In The World? 🤔 kzbin.info/www/bejne/iZrLlIiDjdpgraM 🏗

[@unaincreibleroca3427]

huh? just one like on the pinned comment? or is my youtube malfunctioning?

[@proffed3364]

WHAT

[@proffed3364]

1 COMMENT AND 3 LIKES

[@unduckablealex3048]

Yes

[@saul_goodman-v5f]

The Burj Khalifa.

[@PhillipSea]

1) Do this on the moon. I always thought a "jump through the moon" theme park would be awesome. 2) Why calculate the weight of the traveler and suit? It doesn't matter in a vacuum. 3) You would experience weightlessness for the entire trip, not just at the center of the earth. Thanks for making a fun video!

[@itsdonaldo]

Moon diameter is over 2000 miles. The temp at the center of the moon is between 1327-1427 degrees C. We have to do it on another planetoid

[@OgdenM]

3) actually you will feel like you are weightless but since you are still moving (and very fast at that) and have mass.... One tinny move even in a vaccum and you go slamming into the wall. This is because changing positions means your Center of mass changes which changes the way you are falling. Youd need some propulsion system to keep you in the center of the tunnel at ALL times. Even if it's dug through the axis like the video suggests.

[@oldnelson4298]

2) Because f = ma.

[@felixstuber8046]

​@Old Nelson That means, on the one hand, that you would experience a greater accelerating force if you have greater mass, but on the other hand, more force is needed to accelerate you by the same amount. You can do the in depth calculations if you want and see how the mass cancels out. Or you watch a video of a vacuum chamber where they let fall a bowling ball besides a feather. They reach the ground simultaneously.

[@oldnelson4298]

@@felixstuber8046 Hmmmm, you may be right.

[@michaelquigley1411]

As a fan of physics I have contemplated this in the past. I have to tell you that during your video I was waiting patiently to see the graphic of our adventurer falling through the Earth non-stop and popping out each end of the tunnel. I laughed and laughed and thoroughly enjoyed this clip. Great job.

[@DebunkedOfficial]

Thank you 😊

[@ncard00]

This is why the meaning of life is 42…

[@spvillano]

Only one inaccuracy. The faller would be weightless for the entire fall, as anything that falls in a vacuum is.

[@michaelquigley1411]

He may "feel weightless" but he won't "be weightless". "Weight" is a function of gravity. If there is gravity acting on a body then it has a weight. You might be thinking of friction caused by an atmosphere. In a vacuum he would be free falling in a frictionless environment.@@spvillano

[@spvillano]

@@michaelquigley1411 freefall in a gravitational field is about as weightless as one can get within that field. At least until we come up with a spacetime straightener. ;)

[@diemme568]

actually, weightlessness is felt during the *entire* fall ! (if and when - like in the video's example - the air resistance is zero and the terminal velocity is only due to gravitation: those 28.000 or so km/h) and not only at the earth's center. But ok, we understand that you meant that even something *at* *rest* at the center of the planet would experience weightlessness...

[@nugboy420]

I may be mistaken but isn’t it the feeling of weightlessness due to falling at a constant speed or something? With terminal velocity being due to air resistance there is nothing to stop the acceleration. Even in this case there is as earths acceleration 9.8m/s^2 (I’ll call x) is on the surface and the closer you get to the center x decreases. You are still gaining speed here, however it is less of a gain than before.. even here you feel yourself gaining speed.. Once you hit the center of the earth (tho you would be traveling at a velocity too fast to realize it) your acceleration would be 0. Then as you pass thru the center, gravity starts working in the other way, so -x in which x will increase as a function of how far away from the center and blah blah we know that. My point is brought up because skydivers in air reach terminal velocity but don’t feel weightless, the moving air seems to remind them they aren’t weightless and are falling towards the ground… I’m assuming the zero G planes get around that by the plane itself hitting terminal velocity and having the people inside not effected by wind resistance? Not sure. Also the space station is in a constant rate free fall around the earth hence the weightlessness. This ties back in to the center of the earth. As the jumper’s acceleration lowers towards 0 the presumed weight of said jumper will get lower and lower, though their speed will still be great. (Relate to the plane and skydiving references above). Again this is myself hypothesizing so yeah. If this opens up a discussion I’d like to hear because I know I’m wrong on some parts cuz I think I might be misunderstanding some other things I have learned relative to a problem such as this. Idk I’m smart tho and came up with a hypothesis. Sorry for long response but I’d love to see what I got wrong or if I was right in any instance.

[@fizzmaister]

@@nugboy420 no, you're quite wrong. Any object in free fall will experience 0g. A way of looking at this is to do a force diagram. When you stand on the earth, you're being pulled down with a force of 9.8m/s/s times your mass. You are resisting this force by applying an equal force against the ground. You don't actually feel the force of gravity. You feel the force of you pushing against the ground. I can go into a bunch of stuff about relativity, but suffice it to say, you don't feel gravity because it's not actually a force, but rather the curvature of spacetime. Now take a skydiver. The moment they step off the plane, they're weightless, as they're free falling and only accelerating due to gravity (which you can't feel). However, as they accelerate, they face more and more air resistance, until they reach terminal velocity where the air resistance equals gravity, and they fall at a constant rate. This is the same situation as if you were standing on the ground, and you feel 1g. If the skydiver is going faster than terminal velocity (for example diving headfirst, and then switching to a high drag position, they'll feel more than 1g as they decelerate. The space station does have a (more or less) constant speed. However, it does not have a constant velocity. Anything in a circular orbit is experiencing force at 90 degrees to it's forward motion, resulting in the speed staying the same, but the direction constantly changing. Astronauts in space are weightless because except when engines are firing, they are in a free fall, and only gravity is affecting them. 0g planes work by flying a parabolic trajectory. It's the shape as if you throw a ball into the air with some forward momentum. Again, because it's following a free fall trajectory (and using engines to counteract air resistance), the inside is at 0g during the parabolic section of the flight. Likewise, falling through the earth (in a vacuum) would cause you to be in free fall for the entire duration, and you'll feel weightless for the whole trip, even though your acceleration due to gravity is changing the whole way though.

[@diemme568]

​@@nugboy420 "fizzmeister" here below explained it - but it's a bit complicated. here a *simple* way to understanding the point: *a)* think "free fall is indistinguishable from quietness": that's because every molecule, every atom, every particle of you is pulled downwards with the same, identical, acceleration rate. there is no special point where the "force of gravity" is applied, causing compression or traction somewhere that could be "felt". it's applied EVERYWHERE so you don't feel anything. Everything that's in in free fall feels "still". (examples: the ISS, any satellite - natural (moon) or artificial and any planet in orbit, any star around the centre of any galaxy, etc... - they are all in free fall, only perpetually missing the center of gravity causing the *fall* ) *b)* fall in a *medium* , however, is *not* *a* *free* *fall* . Some surfaces compress or stretch due to the medium's resistance. the wind blowing onto your face and body, when you spring form an airplane, compresses the side facing down, and tractions the side facing up. these forces can be felt, and they cause an acceleration upwards. this force becomes equal to gravity at terminal velocity. then, you no longer accelerate downwards. (but you're still travelling! still falling!) particular case: if the "medium" is the floor, then terminal velocity is reached every time the feet compress enough to decelerate your "fall" into your feet. (in this case the limiting factor isn't velocity, because your feet are solid, not fluid. It would then be the "hub", the path (1/2 cm ?) that you have to travel in order to compress your feet enough: hub completed, force is enough --- you stand *still* ) so the real distinction is between the media (plural of medium) decelerating the fall: a solid compresses tissue via *length* whereas a fluid compresses tissue via *velocity* and quietness is reached at terminal compression length, or terminal falling velocity. ... but feeling the force has always to do with compression of tissue (or traction, if you hang down) in free fall, nothing compresses, or is subject to traction. you don't feel any force.

[@nugboy420]

@@fizzmaister makes sense thanks for explaining. I appreciate lack of sass I wasn’t sure if any of it made sense. In my head it did lol.

[@DeuceGenius]

Why would there be 0 air resistance anywhere on earth except under water

[@DebunkedOfficial]

Did anyone spot the Wilhelm Screams?! 😱

[@HHHjb_]

Yes they are used all over in many movies

[@kaneryu]

You mean hear? I of course, can see sounds myself /s/s

[@jibijay]

Always. It sticks out like a sore thumb. Dare I say, least convincing scream created.

[@phoenix0166]

Yes

[@dylanbetts2928]

5:17

[@EmilyTienne]

Assuming there is air in the tunnel, there would have to be friction as well. The friction would prevent the object from falling all the way through to the other side. Each swing in the opposite direction would become progressively shorter until the object would come to a dead stop at the center.

[@akotarakz]

I was imagining the same 😄

[@GRosa250]

He said the tunnel was a hypothetical true vacuum (unlike outer space) so the object would oscillate indefinitely, unless it was contacting the side of the tunnel.

[@EmilyTienne]

@@GRosa250 A hypothetical true vacuum, meaning both ends would have to be sealed off to prevent the atmosphere swooshing in. Then I could see perpetual oscillation, provided there was no contact with the sides.

[@_WOR]

@@EmilyTienneWhat race are you? 🤨

[@EmilyTienne]

@@_WOR The human race.

[@volkeru2718]

7:45: What has the mass to do with the velocity in a vacuum? References to Giovanni Battista Benedetti (1530-1590), Galileo Galilei (1564-1642) and Robert Boyle (1627-1691). That one would feel weightless all the time has already been mentioned in another comment, however the center would be a place where there is no acceleration and thus, after stopping somehow, one could float there in weightlessness.

[@OgdenM]

Also one thing about a moving mass in a vaccum : Change the shape or position of the center of the mass in anyway and it's gonna change the way it's moving/ trajectory (in this case falling). Ergo, move your hand and you will slam into the wall shortly after. Heck, sneeze and you go splat etc etc. So you'd need that propulsive system no matter what... Even with a whole through the axis. Oh speaking of the axis, it's not like it's in a stable position either. It's constantly moving because the planet isn't a perfect sphere which basically means the axis of the planet has its own orbit... (ergo the axis wobbles and moves in relative position to the surrounding space) And since you are in free fall, you are not effected by it. Oh and speaking of being in free fall, not being effected by things AND orbits... The planet moves quite a bit in it's orbit around the sun in the 45 mins of your fall... I don't think you'll be connected to that movement either because of free fall and that would also slam you into the walls.

[@volkeru2718]

@@OgdenM Hi Michael, I don't think that changing your position, moving your hand etc. could change your momentum or angular momentum while in free fall in a vacuum. Sneezing or even breathing could of course, both being like rocket engines... But it is very unlikely that your nose would not be fully enclosed while being in a vacuum and you would still be able to breathe or sneeze 😉

[@ALDZK20]

This was one of the biggest questions ive had, glad you made an in-depth video about it

[@DebunkedOfficial]

Thanks for watching 👍

[@marmac83]

I see what you did there! In depth!

[@445Vicious]

Debunked's videos are truly a gem I'm glad to have found this channel full of scientific explanations with a little bit of sass Entertaining like nothing else, hope you can always keep going!

[@DebunkedOfficial]

Thank you, those are such kind words 😊

[@tempusfugit9009]

@@DebunkedOfficial I sub bc of comments like this. that whole freedom of speech thing is great.

[@ilmaio]

How silly! Weightlessness will happen as soon as you start falling, and will continue as long as your fall is unimpeded; a free falling body in a gravity field experiences no weight. That's phisics 101.

[@inshort58]

I've always wondered this! Thanks!

[@DebunkedOfficial]

Happy to have answered your quandary!

[@rubycelica]

what a great video that is! i enjoyed watching every minute of it, thank you for producing such a gem!

[@DebunkedOfficial]

Thank you! That’s such a kind comment 😊

[@themaskedcrusader]

interesting fact: a round-trip through the center of the earth takes exactly the same time as an orbit around the earth at the same altitude. Neil deGrasse Tyson mentioned this in one of his interviews. I can't remember who he said did the calculations though.

[@johnmcgimpsey1825]

You can do the calculations yourself. If you're in orbit, you can represent your velocity vectors as two component vectors - the first in the direction of the axis of your hole and the second perpendicular to the first. Both vectors are only affected by gravity, so your speed in the direction of the hole axis in orbit is identical to that of falling through the hole, therefore the time spent during an orbit is equivalent to that of a round trip through the hole..

[@mann_idonotreadreplies]

@john cool story bro.

[@yassinee.3463]

@@mann_idonotreadreplies Shut up

[@doc_ds]

@@mann_idonotreadreplies cool enough to get you to respond

[@aby0ni]

Didn't know that but it actually makes sense since orbiting is like continuously being in a fall without touching the earth, here you don't touch the earth because you're in a hole, in space because you you have tangential speed that keeps you constantly sliding away from earth. Like how a sine wave is the plot of a point moving around in circle but viewed from a side. How about a hole in the shape of a circular loop around the core?

[@biblomatic]

I was waiting for weeks for your new content. Love the host Love the facts Keep it up

[@ruirodtube]

You’d feel weightlessness all the way, not only at the centre of the earth. Like astronauts do when flying a « zero-g » dive.

[@michaelquigley1411]

I have to challenge this. Weightlessness is achieved when centrifugal acceleration equals the acceleration of gravity. Hence, our adventurer will either feel acceleration or deceleration. But for the brief moment he pops out and stops at the end of each fall, he'll feel weightlessness.

[@ruirodtube]

@@michaelquigley1411 the first part of your comment is only true if maintaining stable distance from centre of earth. In this video the subject is falling towards the centre of the earth thus feeling like a passenger of a “zero-g flight”. He’s accelerating at the same rate as gravity is pulling, therefore feeling weightless.

[@CodeKujo]

@5:45 It's much worse than that. Gravity goes down as you get closer to the center. The good news is that means the pressure does not keep increasing at the same rate as it does above the surface, but the bad news is that the reduced gravity and increased pressure will result in slowing down as you fall. It takes *much* longer than a day to reach the center, and you'll be stuck there once you arrive. @8:03 Fun fact: You'd actually experience weightlessness the *entire fall*. Weightlessness isn't the lack of gravity, it's the lack of "restoring force". Being in freefall is indistinguishable from being in 0g.

[@truhartwood3170]

Yup I was looking for a comment already saying this and here it is!

[@trevordick272]

Why does gravity go down, the closer you get to the significantly larger mass at the centre of the earth? Wouldn’t it constantly increase until you pass the core, then reduce as you continue through and past it to the other side?

[@truhartwood3170]

@@trevordick272 at the surface of the earth, the entire mass of the earth is below you, so you have maximum gravity. As it says in the video, you experience no gravity at the centre of the earth because you have an equal amount of mass pulling you in all directions equally, so it all cancels out. The farther you fall, the more mass above you pulling you up, and the less below you pulling you down.

[@truhartwood3170]

@@trevordick272 Even though gravity is decreasing the closer you get to the core, if you're in a vacuum you'd keep accelerating faster and faster until you reached the centre, then you'd start slowing down once you past the centre. That being said, while your velocity is increasing, your acceleration is decreasing due to the lower gravity. You'd be accelerating the fastest at the surface, and would have zero acceleration at the centre, with acceleration dropping smoothly all the way down until you reached that point of zero acceleration at the centre. If you're confused about speed increasing while acceleration is decreasing, think of being in a car - you accelerate the most at first, and as your speed increases your acceleration decreases. You might get to 30 in 3 sec, and then to 60 in another 6 sec. for example.

[@truhartwood3170]

@@trevordick272 considering your question more, the density of the crust is only about 2.5g/cm³, whereas the core is around 13g/cm³, so you're right that the mass of the earth isn't evenly distributed from crust to core. And you're right that the gravity you'd experience from the core would increase the closer you got to it. I'm not a physicist but you may be right that you may initially increase your acceleration at first, maybe through the crust and maybe even the mantle, which is around 4.1g/cm³. But the outer core's density is around 11g/cm³ so not that far off from the inner core. And the outer core is 2,260km thick, so certainly once you got into the outer core your acceleration would start decreasing. And the inner core is another 1,200km thick, so your acceleration would be going down all through that as well as you got more and more of that super dense outer and inner core above you. So you might be partially right that your acceleration would increase the closer you got to the core, at least through the crust and maybe part of the mantle. But definitely once you hit outer core your acceleration would start decreasing. Where that point is would take way more computing than I know how to do or want to do!

[@christopheredale]

Very nice job on how you snuck in the sponsor “Norton’s VPN” within the video/storyline

[@jeffchabotte]

The problem is also that your starting point needs to be slightly further away from the core. Imagine your antipodal point is higher than your starting point, so you come up about 3 ft short of exiting the tunnel. Also, if you launch above the vacuum seal, why not just have it close begins you?

[@marmac83]

It's a youbtube video man. Also not taken into account was that the earth is not a uniform, consistent material. There are clumps of higher density so there would not be a sufficiently even force exerted to pull from all directions when the centre is reached. Heck, the faller would still likely hit the side of the hold and disintegrate before ever reaching the centre.

[@RichM3000]

True. Finding out there's a mountain on the other side would be a disappointment.

[@ScubaDude1960]

Jump when the moon is above the opposite end of the hole 😊

[@rogerjrusa]

I LOL’d at the end especially. So entertaining and informative. Thanks for this gem.

[@MeetRayka]

You answered the question that i thought no one had except me in my childhood

[@MrHarald75]

Guys! As you are falling you always experience weightlessness. Not only at the center of the earth. Also, your mass does have no effect on your rate of acceleration.

[@michaelquigley1411]

I have to challenge this. Weightlessness is achieved when centrifugal acceleration equals the acceleration of gravity. Hence, our adventurer will either feel acceleration or deceleration. But for the brief moment he pops out and stops at the end of each fall, he'll feel weightlessness.

[@MrHarald75]

@@michaelquigley1411 If you were in a box or closed your eyes, you could not tell on what point of your path you are or which direction you are going. You'd feel wheitless=falling all the time.

[@moosefactory133]

I LOVE videos like this. I have thought about this very same theoretical scenario. I have another one, if there was a massive size planet, one as big as a galaxy cluster and you had a hole dug through the center of it, how close could you approach the speed of light falling through it. What would the speed graph look like. At first is would be going up exponentially but at what point would the rate of descent start to slow down as it starts approaching the speed of light?

[@maryhaddock9145]

Excellent! Thought about this 40 years ago and it's brilliant to see it animated and in such a humorous way. Very funny.

[@Quickened1]

Your research and presentation are always top notch! Your personality makes learning fun... Thanks for your hard work!

[@ДаниилКадетов-и9з]

There is no need to use human mass to calculate max velocity (or travel time to the Earth center). SHM are written around acceleration, speed and position. Not around force. And if we write second law of motion for gravitational force: m*a=G*m*M/r^2 where m is mass of accelerating object, then we can see that a=G*M/r^2. Mass of accelerating object is irrelevant. Of course it only work if m is really small compared to M, or else we will need to take into account not only acceleration of m caused by M, but also acceleration of M caused by m. In our case acceleration of Earth caused by one human body is not that significant and can be ignored.

[@cjraymond8827]

I have actually pondered this question over the years. Thanks for answering it.

[@antipoti]

7:45 the mass of the object does not influence the acceleration therefore the maximum velocity calculation should not involve it. Still nice video.

[@Neil-teamBrigade]

Brilliant, fun and funny. Love 'em! Extra kudos on the sponcerships that are done so well, I actually enjoy watching them.

[@DebunkedOfficial]

Thank you!

[@rompevuevitos222]

That segway was great, gave me a genuine laugh

[@DebunkedOfficial]

😁

[@dagmaramaya1354]

You won't keep going back and fourth forever. You lose energy at each end and eventually just stop in the middle.

[@lesterkan]

Your videos are always fun to watch!

[@diyeana]

lol I had to keep pausing since I'm at work, but I greatly enjoyed this video. I'll have to watch it again tonight because I know I missed things.

[@SuperScottCrawford]

This was utterly amusing. I love that it just gave the straight, albeit impossible, answer.

[@darmajid9670]

8:05 You'll feel weightlessness not only at the centre but through whole journey.

[@aintquitewright1480]

Right. You are literally in free fall. Weightless.

[@darmajid9670]

@@aintquitewright1480 exactly

[@maxpower1337]

Strange feeling I think.

[@kiernanmooney6210]

“…or you could just, grab on to the side or something” was somehow one of the most encouraging things ever said.

[@marscaleb]

One thing I'm still curious about: If the tunnel wasn't a vacuum, you'd have an increasing amount of air pressure that slows your terminal velocity, and you'd also have a steadily decreasing amount of gravity, which also lowers your terminal velocity. So if you just had a sufficiently capable pressure suit, how far would you actually fall? Unlike the vacuum, you don't just spring between the two sides, because you lose momentum due to gravity. So what's the furthest you'd fall before going back to the middle?

[@Rumpel-r4d]

the graphics are soo cool !!! and towards the end, when the stick figure jumps endlessly up and down, I completely lost it !

[@rockosgaminglogic]

The air density would continually increase and lower your terminal velocity as you went down, so after passing through the center you would have almost no energy to come out of the center and fall back in. The assumes no temperature effects or other pressure effects like turning the atmosphere liquid.

[@RichM3000]

True. With increasing air pressure and decreasing gravity, the diver might not reach the center, becoming buoyant but with velocity at a certain point, then losing that velocity due to air resistance (like a diver in the ocean).

[@MGZetta]

I mean, if air exists in a vacuum, sure.

[@rockosgaminglogic]

@@MGZetta because you're below Sea Level? LOL

[@RichM3000]

@@MGZetta The hypothetical situations here had many parts. Some included our atmosphere and some stipulated a vacuum.

[@MGZetta]

@@rockosgaminglogic because the video you watched explained the vacuum tube more than your brain cell numbers. Lmao.

[@tzerpa9446]

The way to avoid this would be to allow an easier access to all types of weapons. People should be able to purchase Iron Dome equivalent systems to protect themselves, as well as nuclear weapons as a deterrent.

[@toddhunter3137]

I've sometimes tried to imagine what it would be like and just assumed that you'd get stuck in the centre for ever. The movie Total Recall (the newer one) has an interesting take on a journey through the earth. 👍

[@dr.zoidberg4032]

But the real question is if i jump (feet down) wouldnt i come out at the other side feed up? So other persons would stand on their feet and i would "stand" on my head ?

[@Aviator27J]

I was hoping you'd mention that the 42 minutes 30 seconds would be the same travel time falling through a hole dug from any point on earth to any other point, providing the same features (straight, vacuum sealed, etc). NY to LA would cause you to accelerate and decelerate slower, so despite the hole being shorter, you wouldn't reach the same insane speed. Also, it's funny that the max velocity at the center of the earth happens to be almost the same as orbital velocity in LEO.

[@TheRadiastral]

Actually it's not funny, but completely logical, since in both cases it's the mass of the earth causing the acceleration. The max speed while falling through the entire earth (and I mean through the center, along the diameter) is the exact same speed you would need to be in orbit at (or right above) the ground level, assuming no air, of course.

[@RichM3000]

It would be more of a slide than a fall.

[@DANGJOS]

​@@TheRadiastral The reason is a bit more involved than that, but still relatively simple. But the consequences of it means that this would only be true if the Earth was uniform in density. Because it isn't, this means that the maximum speed would not be the same as orbital (circular) velocity.

[@hiddenself]

To explain the forces, the spring should be attached to the center of the Earth, not to the edge.

[@ExecutionSommaire]

Fascinating, I wonder how much of the strongest material possible we would need in order to keep the structural integrity of the tunnel at various depths. Sounds like a nice little engineering challenge.

[@nidhishunnikrishnan3079]

The temperature at the centre of earth is comparable to the temperature of the surface of the sun (just beneath the corona). So there you go.

[@firetime75]

Звучит как нереальная задача!

[@richjohnson8261]

There were a couple of good laughs in this one along with the good information. Good job.

[@hiddenself]

With air in the tunnel, the terminal velocity would decrease as the pressure increases and the gravity decreases, so you would stop softly in the very centre.

[@BrankoDimitrijevic021]

Small correction: you would experience weightlessness all the way, not just in the center. That’s the reason why gravity is not a force, BTW: a force would feel like weight.

[@licoTheChick]

love your videos!!

[@DebunkedOfficial]

Thank you! We really enjoyed making this one!

[@philosophusbellator]

One of the most entertaining videos I've seen in a long time!

[@DebunkedOfficial]

Thanks! It's great to get comments like yours 😊

[@curiodyssey3867]

'one does not dsimply bore a whole through the center of the earth'

[@MohammedAlfaleh]

Great timing My daughters were asking me this question, I will forward this video to them 😇

[@masterpython]

And somehow they managed to make a version of Total Recall with one of these tunnels in it.

[@DebunkedOfficial]

Indeed! 🤔

[@RobertR3750]

Just discovered your channel. Love your delivery, graphics, and analysis. Well done!

[@Lyken30]

Placing aside the currently impossible suits my theory would be... 1.) As you are falling you will mercifully begin to lose consciousness and be fully unconscious way before you burst into flames while being crushed. 2.) Though you've been long dead there will be an unavoidable point/consequence where the heat and pressure win out over your now unoccupied meat shell. You will be absolutely burned and crushed absolutely. Reducing you to powder. 3.) Plot twist! Life anew! All this will take place well before you reach the mantle. Still, the pressure at this relatively shallow point should (will) be enough to keep the dust cloud, that is you, together. This "area" of you will continue to be more and more compressed. It's here that I should remind everyone that humans are carbon based life forms. So all that remains of you now will be the carbon you was made of. Know what else is made almost entirely of carbon? As carbon dustball you falls farther and farther, heat and pressure continues to increase to near unimaginable amounts until... the Earth literally turns you into a diamond. How many carats you end up being will be determined by your overall body mass (height... weight... muscle density...). You're reborn as a diamond. All diamonds mined on the Earth's surface started as carbon deep within the planet under extreme heat and pressure. They then make their journey to the surface via lava tubes/magma chambers erupting. You may be lucky enough to do the same. Talk about your conflict and blood diamonds! I'm 5'8" with athletic build so I like to think that I would be around a 4 carat (since I can admit I'm not perfect) *near* flawless diamond. My new selfie y'all = 💎

[@Soniboy84]

Wait, does it mean if we drop some coal into the hole on one side, it'll come out as diamonds on the other?

[@thomasg4720]

No, cause the air in the tunnel limit your/the coals speed, so you have not enough energy to come out of the other side and after a few iteration get stuck in the middle.

[@Lyken30]

@@Soniboy84 No... The coal would probably be diamond before it reached the gooey lava mantle but that's where it's journey would end (possibly only temporarily). The mantle is a viscose molten lava fluid. In this video's scenario the only way you would pop out the end over and over is if you don't interact with anything at all. An unobstructed free fall. Because if any resistance is met it will take energy away from your forward momentum. Meaning you would never come out of the other end due to loss of forward momentum. That's why this video need to use magic suits, tunnels (to stop any physical interaction with mantle and core. It also needed to be a vacuum tube. Even in my scenario the diamond made from you doesn't make it past the mantle. That's why I said you might get lucky. Luck referring to being shot back to the surface via lava tubes. Only way "diamond you" will ever see the surface again because you never make it past the mantle. In my scenario there's nothing preventing it from, at least in theory, happening. In fairness, the creator of this video was trying to bring you back alive with no injuries so precautions like suits, vacuum tunnel, no contact with mantle or core were required. Unfortunately there isn't a material on this Earth that the tunnel could be made out of that the mantle and core wouldn't instantly destroy with heat and pressure. Nor are there any materials the suits could be made of to protect you. In my scenario there is a 100% chance you would die to death. It's a one way trip (unless you get turned into a diamond and hitch a ride to the surface in a lava tube 100K to millions of years from now.

[@mann_idonotreadreplies]

Cool story bro.

[@Lyken30]

@@mann_idonotreadreplies That's the product of being bored with a built in good thought process.

[@Imagine_Beyond]

When you are in free fall you will experience *weightlessness* during the *whole* trip! Not just in the center of Earth!

[@OneAndOnlyZekePolaris]

Looks like the "world's" best ride.

[@traveler804]

just came across this channel today.. great presentation, entertaining and engaging.. will definitely be showing my three sons 🤣🤣

[@DebunkedOfficial]

Thanks very much!

[@neilclarkwork]

I disagree with the air pressure argument. If you dig through the earth, you aren’t creating more atmosphere so it should still weigh the same amount. For example, when I am standing on flat ground, the atmosphere above me is less distance than the atmosphere to all sides of me but I’m not being squeezed more on my sides by the air than I am on top of my head.

[@timmo971]

Gravity isn’t pulling on you sideways. It is vectoring towards the centre of the planets mass. It is why you would be crushed at the bottom of the ocean. Infact I would not be surprised that atmospheric gases themselves be crushed together so much they liquified and even solidified.

[@ehb403]

It’s the weight of the air column over you. In your tunnel, you’d now have a taller column over you; while it’s true that the entire atmosphere would have contributed to filling the tube, the impact on the distance to the top of your column of air would be negligible. Of greater impact is that the increase as you descend would be reduced as you approach the core so the increase halfway down would basically be half as fast as at the surface and only 1/4 as fast 3/4 of the way to the center; although denser air weighs more so even this is a simplification. Math homework everybody!

[@changsangma1915]

@@ehb403 ......what of sort of speculative math?! A result from calculated computer simulation of the hypothetical scenario or a really good imagination flex with numbers sprinkled over to mean something that has no ounce of empirical proof?! The guess are just as good as the video tried, but lack all sorts of believability on a irrelevant scientific thought process...like making a hole through a planet is even logical to begin with.

[@ehb403]

@@changsangma1915 no speculation. Read Newtons “Principia”, gravity decreases linearly to zero as you descend into a spherical body. Not saying the TOTAL would not be higher, only that as you approach the center the INREMENTAL contribution would decrease to zero. Also, that no “extra” air is created to fill the hole - it reduces the atmosphere outside the hole.

[@changsangma1915]

@@ehb403 .......is that the best you could use your intelligence to make tangent response to deflect from the questions put on the so called debunk of the most unrealistic piece of sci fi argument?! It falls on the line of arguing Star Trek wrap travel physics....speculative guess game.

[@Siddharth-c1s]

some one give his man the best VOICE ACCENT/ VOICE ACTOR / VOICE every award

[@cyrooski4]

My friend actually did all the calculations for this problem and said that if you drop a steel ball down this hole it would almost make it to the other side but not quite and would start back towards the center and as it approached it's starting point it would be a little further away than it was on the other side of the Earth and as it oscillated back and forth it would keep traveling a shorter distance until it finally was going back and forth through the center very close to the center and eventually would stop in the center. So I'm not sure you have your physics right. This friend of mine developed three patents on quantifying photons for Bell labs.

[@cyalknight]

There is almost no such thing as perfect vacuum. You would probably loose some speed by touching a wall or the few atoms you bump against. Suggestion, have a higher entrance platform and a lower exit platform or rope to grab. If a large shuttle, have wheels that engage with rails once most all speed is lost.

[@jakeg3126]

Yea he got that part wrong

[@thesage1014]

This thought experiment has bothered me for years. Thank you.

[@lucidmoses]

Never thought this idea needed debunking. Well... I guess there are flat earthers out there so maybe.

[@nicholaosskiadas9083]

I am neither a round or a flat earther, I don't know what the trouth is. But forgetting all I have learned in school, spherical spinning earth with gravity, seems questionable.

[@lucidmoses]

@@nicholaosskiadas9083 I can't follow you down the conspiracy theory rabbit hole. It’s not about who tells you what. Science is about sorting out all the conflicting stories by figuring out the truth of reality. You do that with test and experiments. Then you publish the results for all to check by explaining exactly how you did the test. They are not selling you anything and it’s up to you if you want to know the truth or not. If you don’t believe them you can do the test yourself. There are lots of different ways to check if gravity exists and how it works. All the different ways prove the one Theory of gravity is correct. Compare that to the conspiracy nuts. For any one aspect the have an explanation. Trouble is they have to keep changing their explanation for different aspects of the same thing. So what does it prove when their explanations contradict their own other explications. Yet most of them don’t even prove what they set out to prove if you examine them even slightly more closely then they present. It’s all a house of cards that comes crumbling down if you just think about what they said. So it’s up to you. Your either interested in the truth about reality or don’t want to think about it.

[@ct6502c]

@@nicholaosskiadas9083 conspiracy theorist nut

[@nicholaosskiadas9083]

@ct6502. 6502 are probably the loose screws in your brain.

[@ct6502c]

@@nicholaosskiadas9083 Go back to looking for your magic "dome" or "firmament" or whatever. 😂

[@ViperNg1990]

9:28 the spring anchor point should be in the middle of the earth. As you are getting closer to the middle. The tension force gets smaller and smaller. Till you pass the anchor point. The the tension point will start to build up gradually again. From your video. Anchoring from the entrance starts to build up tension the moment he leaps into the hole.

[@drcyb3r]

If you travel through the earth indefinitely, wouldn't that be "indefinite energy" which is impossible? I think it would behave more like a spring and have you bouncing from side to side but each time you would fall back further away from the surface and you would end up floating in the middle of the tunnel.

[@RichM3000]

The moon orbits the earth on the same principle. It is gradually moving from the earth, but it isn't losing energy like a spring system.

[@drcyb3r]

@@RichM3000 Outside of the earth there is a vacuum or at least no air. If you would travel through the earth, there would most likely be air and thereby friction.

[@RichM3000]

@@drcyb3r Partway through, the video specifies a vacuum. With air resistance, the jumper might not even make it to the center due to extremely high air pressure and lower gravity.

[@Theone-ry4de]

@@drcyb3r Pay attention to the video my guy

[@michaelquigley1411]

Your converting potential energy to kinetic energy on the way "down", then vice versa on the way back "up". But total energy remains constant.

[@alexneigh7089]

7:40 What does the way of the falling object have to do with the rate of acceleration?

[@dr.ronbernard9927]

PLEASE…I pay for no ads on you tube. Burying an ad into videos is a violation of the contract I have with this service.

[@MadScientist267]

I've always had this figured out but stopping short of the vacuum. In air, everything else assumed, you'd eventually come to a stop in the center but it isn't a "linear" thing as in the case of the spring analogy. Meaning the "spring" gets weaker as you get to the center. It isn't just storing less energy, it also *can't* store as much energy (due to the surrounding mass cancellation effects). The result is a dampened wave that will want to go on forever. The air drag will have less and less effect as the wave loses amplitude, and the motion will be more like a "drifting bobbing" until the last little bit of energy is taken by tiny amounts of drag. The video also overlooked gravitational drag, the force that causes the moon to lock with earth... but really all that changes within the video is "all of eternity" to "nearly all of eternity" lol.

[@unofficial2480]

Who played Dig2China in my backyard?

[@geogeo1261]

It's impossible to pass from the centre because there are many Menatersaourus and they will eat you alive!

[@dustinplatt6882]

Idk. It'd probably hurt or something. But I'd rather fall through the Earth rather than have a conversation with anyone.

[@sandboy5880]

Edgy asocial kid.

[@markC-888]

Maybe the best take on this thought experiment yet seen. Ty

[@sinchrotron]

7:46 how tf weight of the nasa space suit with a human inside matters on a acc/speed? Are you serious?

[@steverevers]

This AD is so seamlessly implanted into the video, smooth

[@monkeyaround2066]

Correction to @8:04, if it is truly a vacuum, there is no air drag and so the moment he jumped into the tunnel, he is already experiencing weighlessness despite the fact that he is accelerating. He will continue to experience weightlessness until he passes through the center of earth. Actually, even after passing through the center of earth, he will still experience weightlessness as long as only Gravity (and no force) is acting on him. Einstein's theory of relativity heavily relies on this phenomenon - Gravity is not a force. Imagine you jump into the tunnel with a skateboard on your feet the entire time, except that the skateboard is actually a scale to measure your weight. Your weight will be zero the entire time until you have passed the center of earth.

[@hf6553]

Is the oscillating back and forth from one end to the other actually true? I always imagined it that once you pass the center of the Earth the gravitational force will be acting in the opposite direction you were initially falling which would cause you to start slowing down. This slow down would make it so that you don’t actually reach the other end before being pulled back towards the center of the Earth again. With each passing of the center, your velocity and maximum distance away from the center would gradually decrease until eventually you just get stuck at the center. I’m having trouble understanding why or even how you would be oscillating back and forth from each end for all eternity.

[@mooseyard]

Because without air resistance there’s no friction to carry away energy, so you would in fact keep repeating the same oscillation forever. It’s the same reason the planets have been orbiting for billions of years without falling into the Sun.

[@DJcyberslash]

I thought it said it would take more than 1 day, but then said it would take 21 minutes to get through the first half.

[@DetroitShadows]

Was wondering the same thing because I’ve heard about the 42 minute timeframe for the fall and was confused when he said a day to reach the center. Glad I’m not the only one who caught that.

[@DJcyberslash]

@@DetroitShadows Smart man 👉🥇

[@saemi74]

That was brilliant. I´m starting digging right now

[@DebunkedOfficial]

😆

[@PatchCornAdams723]

Karl Pilkington was right then, when he said you could fall through the Earth in 42 minutes.

[@Chris-gx1ei]

Also Worth noting: With Air Resistance you wouldnt technically make it fully to the other side because as you said you'll lose your potential Max-speed to the air around you while falling, meaning with less speed due to the air resistance you might be in the end just stuck in the pipe Because of your lacking Acceleration you might in the end be stuck in that pipe for giving that Impulse of your kinetic energy to the air molecules around you, and with less kinetic energy you would end up in a Position where you will have less Potential energy than in the beginning when you jumped

[@viorelbostan9414]

I loved the video very much! Very well described! I agree with nearly all the things said, but not with the last, he will not fall for the eternity, his max distance from the center of the earth will decrease every time he will fall down again, there is air resitance and the change of gravity (that is higher at the center) so he'll fall few times and then stop at the center forming a perfect ball of liquid steel(if won't also transform in gas due to the high temperatures). But again! Great video💪🏻💪🏻

[@megal0nyx]

Thank you so much for the answer. I been asking everyone this for like 4 years and finally, I got answer!!!!

[@Agrumes_pixelz]

The way the sponsor was smoothly introduced, I just had to sit right through it 😮‍💨

[@MrSergecj]

7:40 it is absolutely does not matter what mass the object has, the speed of the object during the whole “journey” will be the same regardless of the object weight.

[@sikliztailbunch]

If you drill that hole wide enough, the entire earths atmosphere would fall into it. That would FUBAR us all

[@hata6290]

WHAT HOW. Also what does fubar mean

[@sikliztailbunch]

@@hata6290 Well. Air has weight. That´s why we have an atmosphere. Gravity takes care that our atmosphere stays on the ground. If you dig a hole wide and deep anough, our atmosphere would just fall into it, leaving us with no air to breathe. Hence, Fucked Up Beyond Any Recognition (FUBAR)

[@SkibidiLabubu]

The first bit should’ve been “not looking your way”. That would be a perfect rhyme

[@maxxme6746]

When you completely stop, your velocity will be zero.😂 What a genius

[@kevino2783]

I remember using this thought experiment when I was young to get an intuitive understanding of how satellites stay in orbit, it's as if they are always falling.

[@peterbonucci9661]

Using a spring connected to the center gives the correct math for motion through the Earth. Fun fact: if you fall through the Earth with an initial velocity, your orbit has the exit the Earth at some point.

[@smokejaguar67]

f you were to fall through the center of the Earth, several things would happen: Acceleration: As you start falling, gravity would pull you towards the center of the Earth, causing you to accelerate. As you move deeper, the gravitational force would continue to pull you towards the center, increasing your speed. Momentum: As you pass through the center, your momentum would carry you upward, gradually slowing you down. The acceleration due to gravity would work against your motion, eventually bringing you to a halt at the farthest point from the center. Oscillation: After reaching the farthest point from the center, your momentum would start pulling you back down, causing you to fall in the opposite direction. You would oscillate back and forth around the center of the Earth, similar to a pendulum. These oscillations would gradually diminish due to the damping effects of air resistance and the Earth's interior. Friction and Heat: The Earth's core is extremely hot, so as you pass through the deeper layers, the increase in temperature would be significant. The friction from your movement through the Earth's interior would also generate heat.

[@PafMedic]

Best Part Of The Video…Explaining A Record Player😂🤣😂🤣😂🤣😂

[@MERO-VGIAN]

Definitely one of the best video have seen in KZbin 😂

[@JB-xe1nm]

The idea of being in the middle of that tunnel with all that enormous mass around you, gives me the creeps..

[@WardenclyffeResearch]

While falling, the force pulling you down decreases and a force pulling you up increases. Therefore the acceleration decreases very rapidly. I don't think the numbers presented here are anywhere near accurate.

[@alquinn8576]

the "force pulling you up" does not increase. the only thing that matters is the mass of the earth below you, since the spherical symmetry of the higher layers of the earth cancel out the upward force

[@enricoforster5309]

One question: since the atmospheric pressure rises with increasing depth it also means that the density of the atmosphere rises which means that you’re not only producing an incredible amount of friction heat it would also mean that your fall slows down to almost a standstill due to the density of the atmosphere. It may even result in you’re reaching a point when you’re just swimming in the atmosphere because you’re not heavy enough. Or is there anything wrong with my train of thought here?

[@Gavin-ii7ho]

its why meteors burn in the mesosphere and the way down because the atmosphere starts to get thicker, and they are moving extremely fast..

[@wkgurr]

A commenter here mentioned that the same that would happen to the falling person also happens to the air in the tunnel. The deeper you get the less gravity pulls on the air. When you're on the earth's surface the entire mass of the earth is below you. But once you start falling into the hole, the mass above you would increase and that mass pulls in the opposite direction from the mass that is still below you. At the center of the hole the air would be weightless i. e. zero pounds per square inch.

[@Kref3]

7:55 have you also considered in your calculation that with you going deeper and deeper the mass of the earth below you decreases while the mass of the earth above you increases? if only 2/3 of the earth are left below you and 1/3 of the earths mass is already above you, the gravity force pulling you towards the center will not be 1 g = 9.81 m/s^2, but only 2/3 of that while at the same time a gravity force or 1/3 g will pull you up again. You did mention that the gravity in the center will be zero. But did you consider the decreasing gravity forces when you calculated the 28,000 km/h terminal velocity?

[@alquinn8576]

there is no net upwards force due to the earth above you (because that same shell of earth is also "below" you on the opposite side). in a realistic model of the earth with increasing density in the lower layers, your acceleration will _increase_ as you fall from the surface (9.8m/s^2) until you are almost half way to the center (~10.6m/s^2), at which point, it will decrease roughly linearly to 0 at the center

[@robymaru03]

This chanel is actually good.

[@rilosvideos877]

Exactly what i expected 🙂 Will be difficult to cool down the tube in the inner core though liquick iron ...🙄

[@OneAndOnlyZekePolaris]

Someone did a video like this before. Almost the same script as well. But years ago.

[@NeptunesLagoon]

Max velocity is not 28kph… and lessening as the closer you get to the center… smh

[@TheRatLiker]

Ngl, all you need is a cooking pot hat, goggles, some spoons and wood.

[@jhunhior]

welcome back Stu! great video 😊

[@Thorz74]

Just amazing! Thank you!!