Why Gravity is NOT a Force

  Ganger 3,672,634


16 dager siden

The General Theory of Relativity tells us gravity is not a force, gravitational fields don't exist. Objects tend to move on straight paths through curved spacetime. Thanks to Caséta by Lutron for sponsoring this video. Find out more at: www.lutron.com/veritasium
Huge thanks to Prof. Geraint Lewis for hours of consulting on this video so I could get these ideas straight in my own brain. Check out his NOpost channel: ve42.co/gfl or his books: ve42.co/GFLbooks
Amazing VFX, compositing, and editing by Jonny Hyman
2D animations by Ivàn Tello
Filmed by Steven Warren and Raquel Nuno
Special thanks to Petr Lebedev for reviews and script consultation
Music by Jonny Hyman and from Epidemic Sound epidemicsound.com
Rocket made by Goodnight and Co.
Screen images in rocket by Geoff Barrett
Slow motion rocket exhaust footage from Joe Barnard at BPS.Space

Veritasium 10 dager siden
Here's a question I've seen a lot in comments: OK, I'm accelerating up but then shouldn't someone on the other side of the globe fall off? No, here's why: Either watch again from 8:28 or read what I've written below... Spacetime is curved - it curves the opposite direction on the other side of the Earth. Neither us on this side of the Earth nor they on the other side are changing our spacial coordinates - we're not moving up, they're not moving down - Earth isn't flying into one of us. BUT we both ARE accelerating. In curved spacetime you have to accelerate just to remain stationary. The traditional definition of acceleration is something changing its velocity. In general relativity you have to embrace a new definition of acceleration: it means deviating from a geodesic - not going on a straight line path through spacetime. Near the Earth a geodesic is a parabola so unless you're moving in a parabolic arc (like on a zero-g plane) you are accelerating. This definition is the same as the old one so if you're accelerating in deep space then your velocity is changing. *BUT*... if you are near a large mass you are in curved spacetime, now acceleration your velocity is changing. You can stay stationary relative to Earth's surface and still be accelerating. This is because your acceleration should be measured not relative to the Earth's surface but relative to free-falling objects - they are inertial observers. Imagine this - I'm in deep space and I make horizontal rows and rows of stationary golf balls. Then I hop in my rocket and accelerate up through them. Just think about what that looks like. Now my rocket is back on Earth just sitting there. I freeze time for a sec and make horizontal rows and rows of golf balls up into the atmosphere. Now unfreeze time. What do you see? If you just look at the golf balls and the rocket ship it looks the same as the situation in space where the golf balls were stationary and the rocket was accelerating. Einstein's point was the golf balls have the better claim as the "stationary" thing since their experience is just like the golf balls in deep space - no forces experienced. The rocket on Earth is just like the rocket in space. It feels a force and hence an acceleration.
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GMAN 009
GMAN 009 4 sekunder siden
"According to the general THEORY of relativity," the LAW of universal gravitation, "is incorrect." ...
Zordan Rk
Zordan Rk 8 minutter siden
Flat earther come here ...😂😂
맨고급 24 minutter siden
Alastair Archibald
Alastair Archibald 31 minutt siden
What do the LIGO results mean? It was claimed they had detected gravitational waves.
nide pengyou
nide pengyou 43 minutter siden
So what energy is constantly accelerating Earth? Your theory sounds good, but doesn‘t fully add up IMHO.
George Simpson
George Simpson 44 minutter siden
There are a few problems with this argument. Anyhow, it was recently announced that gravity does exist. And it's not because we are moving through space-time. There are no particles or 'gravitrons' as once thought, but gravity is a WAVE. It's that simple. They found evidence of this and it was all published recently. A photo was taken in deep space where they actually got a photo which showed that Gravity is a wave. I think it was about 2 years ago now. This is what an American Scientist told us back in the late 1980s, Robert Lazar said that Gravity is a wave, and there are two kinds of gravity, A and B. Now all accepted by Science. He also said that the US government has Alien Spaceships in storage, and that they use gravity propulsion systems. It's all classified above Top Secret. They are so compartmentalized in their structure that the scientists have made almost no progress in over 50 years of study. He also mentioned they use Moscovium ( AKA Ununpentium) as a power energy and gravity source, and that he worked with it. I showed this data to scientists 30 years ago and they laughed at it, and said it does not exist. It's NOW on the Periodic table. Lazar was right , and he was not lying. He had inside information which was years ahead of even todays standard understanding of physics.
Hardware Loaded
Hardware Loaded 56 minutter siden
this vedio is exact copy of this one nopost.info/throw/s8jNhWWWzH17Zrc/video&ab_channel=PBSSpaceTime
Camilo Alberto Fernandez Fernandez
Camilo Alberto Fernandez Fernandez 57 minutter siden
Blowing minds as always through truth... Thank you very much!
Don Peate
Don Peate Time siden
But aren't quantum physicists postulating that gravity is one of the 4 fundamental forces of the universe? (Gravity, weak force, strong force, and electromagnetism) Of course quantum physicists look at relativity the way General Relativity looks at Newtonian physics don't they?
Trent Landwehr
Trent Landwehr Time siden
This sounds like a flat earth argument to me? Not why I am subscribed to this channel and I am not sure what they are trying to push 🤔
minhaz meher
minhaz meher 2 timer siden
Tell me one thing that's why gravatiy didn't force equal everywhere like in mountain and under ground. If gravatiy it's not a force then why Earth center zero gravity. If only we are exl upward then 9.8 force we can feel everywhere . Reply me.🇮🇳
Akshay Shetye
Akshay Shetye 2 timer siden
Gravitational force doesn't exist as only Space time is curved... Cool But bro Massive objects are infact responsible to CURVE the space time. Thats why Gravitational force is observed isn't it?
kdmq 2 timer siden
4:07 Is your "planet" a picture of Ganymede? lol
charles dupee
charles dupee 2 timer siden
... but like where does the energy to accelerate everything on the earth come from
John Wilson
John Wilson 2 timer siden
Aren't geodesics called Great Circles? The Magic of a Mercator projection map is that a single compass bearing will get the ship and its sailors from one place to another with minimal calculation, and easier instructions to the Helmsmen. A ship or airplane following a Great Circle course has to change its compass bearings at certain times to stay on course and reach the destination as planned.
Shivam Meena
Shivam Meena 2 timer siden
I'll one up you, all force is a illusion
Anujit Maity
Anujit Maity 2 timer siden
Thanks for the video 🔥🔥🔥 so how do u explain the tidal ups downs??
boogaloo 2 timer siden
Young Min Park
Young Min Park 2 timer siden
Why are the human bones dissolved in space without gravity? I ask you if the cells of our body might feel gravity as a force, not an illusion.
Psicanica 2 timer siden
So what do you call the force emanating from matter that acts on and cures space?
RGB Kat 2 timer siden
best video on gravitation
Seven Aries
Seven Aries 2 timer siden
When he talked about the falling guy seeing people accelerating up my mind exploded
Allen Cramer
Allen Cramer 2 timer siden
If you are not sleeping, you are awake.
D Sherman
D Sherman 2 timer siden
Still don't get why mass is attracted to mass if there is no gravity. I mean, that's our basic understanding of how planets form. Orbiting dust eventually argh.. this is where I lose interest in this everytime. Yeah, I didn't finish the vid either..
RGB Kat 3 timer siden
good vfx
Allen Cramer
Allen Cramer 3 timer siden
I think the rocket in the beginning was fake. I could be wrong, but, I'm leaning that way.
Katumba William George
Katumba William George 3 timer siden
Well said. My only question is, what does the 42 in the logo stand for?
Corpo Climb
Corpo Climb 3 timer siden
I was watching Friends episode yesterday. So Phoebe proved it before anyone else. When she said to Ross "I don't know, lately I get the feeling that I'm not so much being pulled down as I am being pushed" Maybe She is right about Evolution too 😮
Christian Earle
Christian Earle 3 timer siden
So, gravity is not a force and gravitational fields don’t exist? So does that mean gravity doesn’t exist? If there isn’t gravitational fields, then there’s no gravity because what is gravity without gravitational fields?
Darksilverjesse 3 timer siden
as much thought and effort went into this, I feel as though you found some college student's hypothesis on a master's degree... I wouldn't pass the student based on your interpretation or presentation. Gravity is a force, in the same manner as magnetism is a force. gravity is merely the atomic magnetic field where magnets are... magnets. I mass is a congregation of molecules and atoms, each with their own field, as the fields collide they draw upon each other, binding, growing, the "mass" of the field never changes, but rather (like fluid) shifts to the remaining empty space, as matter gets denser, the field gets squished outwards; drawing in more matter. It is only when you leave the pool of gravitational force that your own matter's field is stabilized around yourself. think of a drop of water on the surface of a coin, now drop that coin into a test tube of water, the water in the tube will rise from the addition of the matter "the coin" and the water that was on the coin. if you were to draw the coin out of the water, maintaining an ideal surface, you would draw out the matter, and the water, still tensioned on the surface of the coin. Gravity is a force, it is an atomic bonding force. Just because the coin still feels water on the surface as it falls to the bottom of the vial, the same as it would sitting suspended in the air, doesn't change the fact that it has water. What this video discusses is merely the relative equalization of inertia, where the gravitational force matches the force your own body emits.
Januar Tanzil
Januar Tanzil 3 timer siden
ok this whole thing will be a lot easier to understand if the earth is flat.. and spacetime is also straight.. lol
Chris Allen
Chris Allen 3 timer siden
Jesus...science has made such basic principles so unnecessarily complicated its ridiculous. How about we just say that gravity is an expression of electricity (since we know the universe is electric). All the ''forces'' in physics are all a derivative of electricity, just at different magnitudes/scales.
Mr.Amit Sharma
Mr.Amit Sharma 3 timer siden
if i want to fly statunary i maens not in tuch of grond not flying up not going down (if i want to do this means i should go 9.8m/s upwars continusly ??)?
SG 3 timer siden
This is bunk (for many reasons). Thumbs-down. :(
Nikul Patel
Nikul Patel 3 timer siden
If space itself is curved around a planet, then why does a moving spaceship turns so much and light bends only slightly? Should not things moving at various speeds bend (turn) equally?
David. 4 timer siden
is this what DMT feels like?
Shreyash kadu
Shreyash kadu 4 timer siden
This man goes in space,his rocket crash on a planet and then he reborn to teach us physics... But we are still in lockdown...👍🏻
Chris Ruberg
Chris Ruberg 4 timer siden
Wait. What. That was Sydney Uni main lawn !
Jared Gambrill
Jared Gambrill 5 timer siden
if gravity isn't a force, what did LIGO detect?
Low Waste, High Melanin
Low Waste, High Melanin 5 timer siden
This hurts my head so much
yashraj vaidya
yashraj vaidya 5 timer siden
If gravity is not a force then how asteroids passing near a planet gets attracted towards it
mikenco 6 timer siden
OK, explain two people falling off roofs on the opposite sides of the planet!?
mikenco 6 timer siden
Is it like a river, i.e. we're all 'going with the flow', hence why we're stuck to the planet surface?? If so, what happens to all the SpaceTime when it congregates in the centre of a massive object, like the Earth? Does Space Time has Mass?? This video is a real eye-opener, but creates more questions than it answers.
DangerousPie03 6 timer siden
This video and Vsauce's "Which Way is Down?" contain some secrets of the universe, I'll tell ya hwhat.
DangerousPie03 6 timer siden
So, staying still is the real acceleration?
rick Fischer
rick Fischer 6 timer siden
So, what exactly is our velocity through space-time when we have no velocity through the three spatial dimensions? Is it then our velocity through only the time dimension? And is that why time changes when we do have a velocity through the spatial dimensions? OMG, this is starting to make sense.
Steven Bingham
Steven Bingham 6 timer siden
Sorry, I don't buy it. If there's no gravitational field, then how can space/time be "curved" by a body in space. Further, how can that body create a greater curvature relative to is size/mass?? I think we still fail to understand the secrets of the universe because of the limits of our puny perception.
Radomire B
Radomire B 6 timer siden
wait now what about gravity waves? They said they found those not long ago
Alan Pereira
Alan Pereira 6 timer siden
I knew I wouldn't understand anything. I wasn't wrong. haha
Axmed NapoLi
Axmed NapoLi 6 timer siden
So this was basicaLLy a debate whether gravity is an iLLusion or not
TheJaggs YT
TheJaggs YT 6 timer siden
Man that Spaceship, thats some grade A low poly Blender shading Dude!
TheJaggs YT
TheJaggs YT 6 timer siden
Shouldve watched the hole vid before commenting.
Marlin Pals
Marlin Pals 6 timer siden
Gravity is a manifestation of implicit valence bonds.
MicroMicro 6 timer siden
oooo no one cares
Barry Butler
Barry Butler 6 timer siden
GAB- Could matter simply displace the fabric of space causing a area of compressed space around that object that diminishes with distance , and we as matter are like an area of low pressure in an area of high pressure being drawn toward the earth which is a much more extreme area of low pressure due to size and composition much like low pressure systems in the atmosphere tend to be drawn to each other often combining into a single area of low pressure which would make gravity more like buoyancy ( varying areas of condensed space) than acceleration ?
Peter Thrun
Peter Thrun 6 timer siden
Problem is that people around a circle, like the equator are all accelerating, supposedly, in the same direction, so if the earth isn't expanding, which it isn't, how are all the people in the circle accelerating in the same direction? And if everybody around the equator jumped off a roof at the same moment, how are they all not falling at the same time?
d w
d w 7 timer siden
True, Gravity is NOT a force. Gravity is an energy field that acts on mass by constantly accelerating it downward at 9.82 m/s^2, and this translates into a measurable downward force that we call weight.
Russ Hamilton
Russ Hamilton 7 timer siden
OK so if gravity is not a force why should it only propogate at light speed? Wouldn't it be infinite. But then again if it does not propogate at LS how could you get a stable orbit? Wouldn't the satellite be constantly pulled toward where whatever it is orbiting was rather than where it is or is there some sort of cancelation effect that I don't know about?
Joe Smith
Joe Smith 7 timer siden
Elephant in the room: I don’t think that’s a real rocket. In fact, I don’t believe you went to space at all. There I said it.
Eric Bykov
Eric Bykov 7 timer siden
This is idiocy. The gravitation that attracts everything around to the massive objects are nothing like to the high velocity objects that pushes down things on the surface or insides. This hipe-douche tries to compare “hot” and “big” with each other
Duggy Dugg
Duggy Dugg 7 timer siden
large masses exert gravity on things close to them.. the scientists postulate that all matter attracts all matter... But that there is little noticeable effect unless the item is large such as the earth... rather than worrying about this question we should be concentrating on stopping in government borrowing that creates massive unpayable taxpayer debt... the plastic tsunami threatening to strangle us the loss of drinking water pollution
Anttu Murikka
Anttu Murikka 7 timer siden
that is wrong, if you measure 0.000000000000000000000001 accurace two falling ball they falling is little difference, we know that all
David Ferguson
David Ferguson 8 timer siden
How fast do gravitational effects propagate?
giggleherz 6 timer siden
If you mean does time have any effect on gravity it seems it does not. So a fast spinning windmill will still feel the same affect as if it was rotating slowly.
Pedro Salles Souto Ferreira
Pedro Salles Souto Ferreira 8 timer siden
Spectacular and deeply appreciated
Torah Bear
Torah Bear 8 timer siden
Except for the buoyancy principle, and aether that Einstein denied.
James Shannon
James Shannon 8 timer siden
It's difficult for me to follow. I had to stop and go over things quite a bite. But it did answer a few questions I wondered at. Thank you
Jonathan Chairez
Jonathan Chairez 8 timer siden
I insist, why do two bodies with different weight or mass fall witt the same speed or acceleeration? It is not a trivial question, it's fundamental to understand the nature of gravity. Mr. Veri. Thanks.
Joseph Pomaville
Joseph Pomaville 9 timer siden
Ok if we are accelerating upwards through space time on the surface of the earth where is the ewnergy for this acceleration through space time coming from?
Noel Roberts
Noel Roberts 9 timer siden
So, an inertial observer feels weightless and can have "things" in her frame of reference, as can someone who's not an inertial observer. The inertial observer feels weightless because they are moving through Spacetime (or even staying still?) at a constant velocity (and thus no acceleration). Constant velocity means there's a vector / direction which is a straight line in their inertial observer view. Now two things can happen: 1) Effect visible to external observer, no effect on person in the rocket: No large mass bodies around, so travel continues in a straight line (non Geodesic?). A large mass object is around, impacting Spacetime, such that the inertial observer travelling through that affected Spacetime still feels no change. It still feels like they are still moving in a straight line (and feels no acceleration in any direction), but appears curved to an external observer (which now would be a Geodesic?). 2) Effect visible to external observer, and an effect on person in the rocket: Force is applied to the rocket, causing acceleration, thus causing a deviation from the inertial observer's view of a straight line, and loss of a sense of weightlessness, and they can thus feel the change to their course. This means a deviation from the straight line Geodesic. A couple of questions: 1) If there's theoretically no large mass bodies around (or any other mass) then is the trajectory still a Geodesic? Is that a silly question, since there's mass everywhere that the trajectory is always a Geodesic? 2) Is it possible to not be moving, and be "still"? Or is that also a silly question, since there will always be "movement" relative to something, and it depends on what the reference is?
mito 7 timer siden
Both questions are rather intuitive. The definition of a geodesic is just a name for a trajectory/path. And second, applying force (e.g. acceleration) to an object will change its trajectory. The latter question is simply answered by another. By what frame of reference would qualify something as non-moving/still? Motion itself is always relative, as it genuinely has no meaning if it cannot be compared to anything else.
Pat Di
Pat Di 9 timer siden
In one episode of FRIENDS Phoebe told Ross that gravity does not exist, that she feels rather pushed up than pulled down and of course Ross argued. Turns out she was right :D She also said she doesn't believe in evolution, so now I am just waiting for lil green men to come around and tell us we have been planted here lol :D
Mykola Ivanchenko
Mykola Ivanchenko 9 timer siden
Also if acceleration would be applied to every particle in the rocket the same way, then once again there would no force, according to this theory. So basically if we are in the acceleration field it is not somehow a force :) is it really so? Seems like there is a lot of fus around definitions
vibhor kohli
vibhor kohli 10 timer siden
Considering this view of gravity, how does one explain the minuscule growth in height during sleep?
Nova Sama
Nova Sama 10 timer siden
Ok so i understood everything u said..hardly..but i did....but something really doesnt click...i just cant imagine curved spacetime...the whole accelerating even tho nothing is pushing me just doesnt make sense....i get the fact that if something pushes me it would seem like its pulling me towards it but i cant imagine how earth is not moving towards me but its still pushing me....maybe in a future video you could explain that but now the..big things atract small things seems to make more sense to me..even if its wrong
Magnus 10 timer siden
How does this match up with quantum gravity, gravitons, celestial movements or string theory?
megatedium 10 timer siden
I guess the clone machine plans from the Science Asylum leaked thru spacetime.
Fuch Zenn
Fuch Zenn 10 timer siden
you can't prove that gravitiy isn't a force.
mito 7 timer siden
Well, if I drop a ball and something happens...
Scott Tillman
Scott Tillman 10 timer siden
This is too complicated for my small brain. But, as a skydiver, I can tell you that body movement while falling are does not feel weightless.
sbcontt YT
sbcontt YT 10 timer siden
If this is the current conclusion then can we say that quantum gravity debate is over?
Yuvan Hardowar
Yuvan Hardowar 11 timer siden
Ok, ok, hold on... When I'm drawing free body diagrams in my exam, is the acceleration due to gravity [of a falling object] there or no? Do I put upward arrows on everything else? 🤔😂😂😂
Uday Sharma
Uday Sharma 11 timer siden
Is it okay to say that the object which we think is falling has actually stopped accelerating upward along with us?
Christians Pray for USA
Christians Pray for USA 11 timer siden
These people are the same people that believe in the evolution, that explains how they can believe this stuff !
Christians Pray for USA
Christians Pray for USA 8 timer siden
@SpottedSharks these are the people that show the Earth sitting on some kind of mythical net ! Why would this fouce only be on the southern hemisphere, why is it needed to hold the Earth up ! The Earth is floating through space orbiting the sun !
Christians Pray for USA
Christians Pray for USA 8 timer siden
@10d20 Unpainted Minis even if a person ever created a chromosome, who is going to program it ? Chromosomes have a lot of *very specific* information in them *specific enough to determine your finger print for the rest of your life* , but skin cells last less than 1 month! Human's chromosomes have enough information to fill an entire home wall library, and more, with this *extremely specific* information !
Christians Pray for USA
Christians Pray for USA 8 timer siden
@10d20 Unpainted Minis "all point mutations" that have been studied on the molecular level *turn out to reduce the genetic information* NOT increase it" Dr Lee Spetner, biophysicist and physicist ! the same type of evidence has been observed by scientists, Dr Michael Denton and Dr Don Batten, with the same conclusion ! *So pond bacteria could never* become even a snail regardless of the number of generations !
10d20 Unpainted Minis
10d20 Unpainted Minis 9 timer siden
@Christians Pray for USA Bathe in my milk! Soy, almond, or traditional. Use my sponge, I will watch you. Offer open to men only.
Christians Pray for USA
Christians Pray for USA 9 timer siden
@10d20 Unpainted Minis The strongest destructive force controlled by man* is tearing apart one of God's smallest building blocks ! Forcefully changing unstable atoms can destroy a city, forcefully changing more stable atoms (hydrogen) can destroy a small country !
Christians Pray for USA
Christians Pray for USA 11 timer siden
When did Einstein have a rocket to test his theory ?
Christians Pray for USA
Christians Pray for USA 11 timer siden
Life is not the twilight zone ! Come back to reality !
SoyBoyGaming 11 timer siden
Sitting in couch ourdoors? Video downvoted.
David Nemati
David Nemati 12 timer siden
It would have been better if he had clarified and contrasted the Newtonian and relativistic definitions of "force", preferably pretty early on in the video. A Newtonian force causes the velocity of something to change, while a relativistic force causes something to diverge from a geodesic, as defined here. (Until nearly halfway through, he had not addressed that at all, and I was getting furious at it.) I'm glad he added his pinned comment!
Newhistory 12 timer siden
This means Earth is flat???
Jason Doelker
Jason Doelker 12 timer siden
Gravity is not a force or an illusion...gravity is an ATTRACTION...exactly as two magnets attract. That is all.... simple as that. You want more of a reason....a planet of electrostatic force from molecular motion attracts to all things .living and non living, with electrostatic force of own molecular motion. The closer the objects are to each other, th
Wesley P
Wesley P 12 timer siden
i dont think so. just because someone made some equation doesnt make it correct. also your absolutely terrible at explaining ideas. we live in a universe with more then 3 dimensions and no one really ever tries to account for matter interacting interdimensionally. also time is an illusion. it doesnt exist. so it cant be part of any equation.
Lvi Israel
Lvi Israel 12 timer siden
For a sponsored show about physics, there is a glaring flaw in the smart switch instructions, therefore the smart switch will not work that way. I'll explain: the general steps are 1)turn off the power [safety first!] 2) disassemble/uninstall old switch 3) assemble/install smart switch. It won't work=> you never said to turn the power back on. Just messing with you- the myth of gravity is very intriguing. The man who fell will not crash to the ground.... the ground crashes in the man.
Kareem Salessi
Kareem Salessi 13 timer siden
5:30 ISS is fake!!! 7:00 rockets canNOT work in "Vacuum of Space", because Rockets tailspin as soon as they enter "Vacuum-of-Space", thus they can NOT go anywhere!!!! Go, figure out!!!! 14:00 light bends::: NOpost::: ("Bending of light | Laser bending demonstration | Science Experiment video")
10d20 Unpainted Minis
10d20 Unpainted Minis 10 timer siden
Bathe in my milk! Soy, almond, or traditional. Use my sponge, I will watch you. Offer open to men only.
Keith Brookes
Keith Brookes 13 timer siden
How is the gravitational constant, "G" derived from F=Gm1m2/r^2. ? If all the stars in the sky are moving how do they appear to remain stationary relative to each other from an observer on earth's perspective?
Gummi Baum
Gummi Baum 13 timer siden
Grad explained, thank you
Osama Al-Khanchi
Osama Al-Khanchi 14 timer siden
I just watched this to remove it from my recommendation permanently
RW Green
RW Green 14 timer siden
This is some of the same logic the flat earthers use. No gravity but the earth pushes up!
James West
James West 14 timer siden
So, the Moon is not causing the tidal changes with the force of its gravity?
Narf Whals
Narf Whals 11 timer siden
No. It is causing the tidal changes with its spacetime curvature influencing the geodesics. But it is much easier to model with a force.
uhm179 14 timer siden
8:32 no, thats the Second Coming
oiuet souiu
oiuet souiu 14 timer siden
bruh as a currently struggling physics student, this has just thrown away everything ive learned so far
Narf Whals
Narf Whals 11 timer siden
@oiuet souiu But no force changed your direction. You were walking on what is a straight line from your perspective the entire time. The tiny change in direction is what defines the curvature and can be measured with parallel transport.
oiuet souiu
oiuet souiu 14 timer siden
step, your direction has changed by some angle which is so negligible that you will not notice it. So its not gravity pulling both of these persons together without a force, it is ju
Radek Svoboda
Radek Svoboda 14 timer siden
Then why does light not follow straight paths in space time?
Radek Svoboda
Radek Svoboda 2 timer siden
@Narf Whals A thought experiment: Two parallel mirrors, 100% reflective. in close vicinity to massive object. Does a beam of light reflecting between the two mirrors start to move towards the object? As we know, particles follow the straight paths independent of their mass. So on Earth, will the beam look accelerated at 9.8m/s2 toward the Earth?
Narf Whals
Narf Whals 11 timer siden
It does. Straight paths just aren't what you expect them to be. Light bends around masses.
yossieven 15 timer siden
so, trying to bend my head around this... is this explanation the same thing? nopost.info/throw/q5uxmZ_YtJlyqsk/video&ab_channel=TheScienceAsylum
Narf Whals
Narf Whals 11 timer siden
Yes. Hes just using an analogy. The motion arrow turning is the same thing as the geodesic.
Иван Грушин
Иван Грушин 15 timer siden
Space-time curvation is about the light, not about a body at low speeds.
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