Why Gravity is NOT a Force 

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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 SLtv 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



9. okt. 2020

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Komentarjev 100   
Veritasium Pred 13 dnevi
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.
adorable Pred 4 dnevi
adorable Pred 4 dnevi
adorable Pred 4 dnevi
adorable Pred 4 dnevi
adorable Pred 4 dnevi
Mr. Quiroz Astorga
Mr. Quiroz Astorga Pred 9 minutami
What if i'm a metal touching a magnet? I know magnetic fields do exist, so how is this different from the accelerating rocketship / standing up on earth analogy?
javal Gandha
javal Gandha Pred 34 minutami
This video was brilliant and Profound. Thanks Derek. Keep up the awesome work.
Tyson Zion
Tyson Zion Pred 35 minutami
Those bastards lied to me
JeTeL Pred 43 minutami
those are some serious accusations here; so, how exactly is spacetime curved around/under/for/.../ myself, when i am standing on the surface of planet? maybe simple picture, animation...because it just doesn´t seem to make sense at all, no matter how i put it...
cobra3289 Pred 43 minutami
If gravity is not a force, what force is pressing my body to the ground?
Patrick Harvey
Patrick Harvey Pred 48 minutami
Javier Albinarrate
Javier Albinarrate Pred 59 minutami
Answering 7:49 "Are you watching this in an inertial frame of reference? do you feel weightless?" I am sitting at the toilet right now, does that count? I certainly feel a lot less weight than a few minutes ago.
Fook Billgates
Jamaluddin Khalifa
i thought i'd NEVER understand relativity... and this video gives me hope that i might JUST about be able to understand it...
bouytt guyt
bouytt guyt Pred uro
So we are stuck to the earth because earth is moving which pushes us to accelerate on the ground? sry I’m not that good in science 😅
MrRexQuando Pred uro
Love your videos! So I think 3 things kind of blow this up: 1. Convection 2. Spinning masses 3. Negative free-air gravity anomalies discovered on Mars If you can create your own reference frame (such as an IMU) doesn't this go against the very example of pass by a planet? If this weren't the case how would our solar satellites navigate other than optical references? If a spinning mass and it's apparent change in gravitational influence doesn't invalidate the whole space/time thing I don't know what does. Spinning or not it should have the exact net effect as the attracting body has no awareness of the spin.
bouytt guyt
bouytt guyt Pred uro
I identify as an inertial observer
Alan Brewster
Alan Brewster Pred uro
he filmed himself pedaling on stationary bike
Binod RR.Empire
Binod RR.Empire Pred 2 urami
Plz Read :::Can i please know why an object is said to accelerate by 10m/s every second while falling from height,,,If the earth is accelerating instead of the object.If earth is accelerating then the earths acceleration must increase 10m/s every second.Is it??Plz do answer.I am satisfied with this definition of gravity but not fully.
bearbro 123
bearbro 123 Pred 2 urami
whos here cuz of community montessori ICP
Mihai Ciocoiu
Mihai Ciocoiu Pred 3 urami
Could you please buy markers that don't make that noise? Great video and all, as always. Thanks!
rolmops Pred 3 urami
I just had that "aha" moment. Gravity is, in a way, an effect of time. You can't stay in an inertial reference frame around mass, because that would require you to stay in the same spot in space and time relative to everything (or nothing). The bigger the mass of the body you stand on, the more you accelerate away from a straight line in space time, and the more time dilates from an other non-relative observation point. Need to find a better way to explain this, but gravity as an effect of time (and thus space-time) makes sense
hEY you
hEY you Pred 3 urami
well it will be a 50 years before it is learned in schools.
Jeremy Acton
Jeremy Acton Pred 4 urami
Some scientists point out that was actually shown that the sun did not bend distant starlight with the curve of its local spacetime as 'predicted'. It was a refraction effect that occurred only in the solar photosphere, and 'gravity' did not bend light.
Pablo Escobar
Pablo Escobar Pred 4 urami
Electric Universe explains it simpler.
Cholo Segovia
Cholo Segovia Pred 4 urami
I just realized on the second half of the video how cute he is. lol But kidding aside, I learned a lot from this video. And it's weird how when a question comes up in my mind, he addresses it right away lol
Jeremy Acton
Jeremy Acton Pred 4 urami
But WHY do massive objects curve space time? Why and HOW does matter tell space time how to curve?
troll randon
troll randon Pred 5 urami
It is a force
Daniel Kim
Daniel Kim Pred 5 urami
If anyone wants an actual physicists point, check out Fermilab's latest video, Dr Don explicitly says this is wrong @11:00
Tahsin Maria
Tahsin Maria Pred 5 urami
Einstein: That's it. Gravity is not a force Newton: Wait. Do I know you?
Daily Dose oF Fun
Daily Dose oF Fun Pred 5 urami
what will it look like for a person in the 4th dimension? when you showed the earth as a 3d object but we look at things in the 2d (like a mat). so thats how it curved, the path of the plane
HarisShahzad Pred 6 urami
I identify as an inertial observer
Jackie Lim
Jackie Lim Pred 6 urami
So we are stuck to the earth because earth is moving which pushes us to accelerate on the ground? sry I’m not that good in science 😅
callmeadmin Pred 7 urami
If gravity is not a force or forcefield, then why is it still spreading at the speed of light from the source, like light or magnetic field? Or is the whole concept of force wrong?
James Fagan
James Fagan Pred 7 urami
Time travel is very possible because the particles of nurobotic science are starting to dollypopper inminatos fhiberlosserpoppy in gravity and solopoppyjijjing faster than the speed of light, mossylip digger the big leap solos
James Fagan
James Fagan Pred 7 urami
Pure genius
faiz ur Rehman Ansari
Marvelous 👍👌👏👏👏
bzdawek Pred 7 urami
If ISS is travelling in a straight line and it appears to be orbiting the Earth due to curved spacetime, why it's impossible to put light into orbit?
Dávid Kovács
Dávid Kovács Pred 7 urami
Can I use this for my power point presentation?
cobra3289 Pred 9 urami
Gravity is a force , he is just playing your mind by this explanation.
ProgM Pred 9 urami
If gravity is explained as earth and people on the surface both move at the same speed and acceleration, then why does human skin sag downwards with age?
stew360 Pred 10 urami
@Veritasium But acceleration has a direction , and the problem isnt that we are acelerating but the whole " spaceship " explanation wich is way to simplistic to apply here and do not explain how a sphere could accelerate in all direction to create uniform gravity across a spherical object ... isn't it ? Please make a video that make sens explaning how a sphere not a spaceship can behave this way ?
The One Ton Hammer
The One Ton Hammer Pred 10 urami
If acceleration continues unabated, don't you achieve the speed of light over time?
wow7 Pred 10 urami
The old-school definition of the word "force" is a push or a pull. Gravity pulls you. Ergo, gravity is a force. Also, the argument that Special Relativity and General Relativity are different because one talks about how Speed bends space-time and the other one talks about how Gravity or Mass bends space-time is simply two different ways of looking at the same thing, i.e., the curvature of space-time. And the curvature of space-time extends indefinitely into space-time, and does what a gravity field does. For clarity's sake, it can be called a gravity field. Semantics is not science. Also, the speed of light is changed by a gravity field. What is the speed of light inside of a black hole? Just saying.
Jaime Feraer
Jaime Feraer Pred 10 urami
If there is no gravity I am 0 grams
You Learn Education
You Learn Education Pred 11 urami
This video was much needed because the common perception of Einstein’s gravity is much misleading. This video explained the true view
You Learn Education
You Learn Education Pred 11 urami
Gravity as understood by Einstein is simply moving in a straight line path through four dimensional space time. No acceleration required. Because space-time is warped, and thus time is warped with space, when moving in a straight line through its curvature while no forces act on you, a point in time in the future is correlated with a lower position in space, so your next moment in time is downward.
You Learn Education
You Learn Education Pred 11 urami
This video helps explain veritasium. sltv.info/label/esd2lrKvbphrems/video
You Learn Education
You Learn Education Pred 11 urami
But veritasium, the standard model of particle physics states that gravity is a fundamental force.
Might jump out of a roof to make einstein's imagination real
Ajay kaja mobile
Ajay kaja mobile Pred 11 urami
Which means our solar system is moving international space station also moving but why they feel zero gravity
Geri Acheson
Geri Acheson Pred 12 urami
Why does the window washer "fall" if there is no gravity?
the infinite
the infinite Pred 12 urami
why things eccelerate towards earth once it enter the atmosphere if there is no gravitational force then things should not gradually get faster from the empty space to the atmosphere to the earth the speed should be the same since earth it self is whats moving
the infinite
the infinite Pred 12 urami
but then how u explain things been lighter under water
Henry Monroy
Henry Monroy Pred 12 urami
My problem grasping/believing this is that this only SEEMS to work on a flat plane. Earth is a sphere, and cannot accelerate in all directions at once w/o expanding. Please help me understand where my misconception is, if there is one.
the infinite
the infinite Pred 12 urami
he has a point..its the same weightlessness u feel when u traveling in a car and it's max out u aint move but u feel like u floating ..that because the car is moving faster than the earth is spinning ..i could be wrong but it makes all scence to me.
IWashMyOwnBrain Pred 13 urami
This video is an ad.
Nico Cruz
Nico Cruz Pred 13 urami
5:26 Hey Kim K... head due north in 3 2 1! 😉
Dylan Bonneau
Dylan Bonneau Pred 13 urami
I’ve just released a video on a framework for physics I’ve been chipping away at. Oddly enough, there are plenty of dissidents in the field of physics who object to relativity, pointing to numerous paradoxes in the current model. Check it out, Derek! With an open mind, you might be compelled by some of my later points.
Gustavo Morales
Gustavo Morales Pred 13 urami
This is in your top 3 of videos! Thanks Derek!
Myungkyu Pred 14 urami
12:30 kicked in the face while floating in space.
Trentin JJ
Trentin JJ Pred 14 urami
I feel bad for the man whole fell that high
khalid9999k Pred 15 urami
Video explains : There is no gravitational force because there is no gravitational force? Lmao
Xboomer1 Pred 15 urami
Gravity is not a force. Gravity is the effect of mass on spacetime. It is not a "fundamental force"... it does not reconcile with the Unified Field Theory, and therefore should be excluded from the equation... NOW, you can unify the Electromagnetic force, the Strong Nuclear Force, and the Weak Nuclear Force... there are specific bosons for this. It would appear those bosons are the "unifying factor", the lowest common denominator. AND YET... there is the HIGGS Boson... if the mass of the Higgs Boson were greater, the stronger the gravity would be in the universe... and yet it still does not reconcile??? Maybe another reason? Gravity is NOT an attraction force, nothing is really pulling on you, you are falling in a warped space towards the center of that warped space, the center of the Earth in this case.... objects FALL... but are not attracted... two steel balls, 1 inch in diameter, 1 to 2 inches apart in space will come together in about 20 minutes... NOT because of particle attraction, or electro-magnetism... but because the overlap areas of curved spacetime... and FALL into each other... we and objects are not attracted to the earth... all objects are surrounded by the negatively charged electrons of their atoms... THUS, like poles do not attract... but objects do become close... that is because they FALL in spacetime. There does not have to be a Higgs Boson for this to happen, in my opinion... but then I am not a Physicist, or Quantum Physicist.... and it took me YEARS to get my head around this. I independently came to notice this, in the early 2000's, as I had watched some shows on this...and the shows kept saying..."the gravitational force", or "the force of gravity"... but another show said what Einstein said..."Gravity is the EFFECT of mass on spacetime"... mass curves spacetime... and THUS, gravity is not a force... the "weight" of a mass... causes spacetime to curve, it is not the electro-magnetic charge of the particles attracting objects, those evidently cancel out... the effort of the mass of a ball, indents the cloth... this effect is what we call gravity. HOWEVER... there is "Gravitation-AL..." and that is not the same as Gravity. "Gravitational" is a polarizing motion, or energy... there is an area in the universe that is an area of striated space, polarized... because of this "gravitational force"... that moved through that area. Gravity itself may not be movement, or motion, but affects it, setting up Potential Energy...but "gravitational force"... IS... the energy of that movement... there are GRAVITATIONAL WAVES... in space... waves are motion... a kinetic energy wave... a wave in, on, or through spacetime. Spacetime is a medium. I did not believe that gravitational waves, or even the Higgs Boson, existed before their discovery. I thought..."Gravity does not act that way, gravity does not move OUTWARD in a wave, gravity SUCKS...right?" But GRAVITATION-AL... is not the same as Gravity... It moves... but I don't think that makes it a "fundamental force" with gravitons, and such, but I could be wrong... I don't think there are "space-tons, or time-tons", or particles...Why... because we are told "two objects cannot occupy the same space at the same time"... and yet space expands, and time moves forwards.... movement is action. Action is Energy... but energy does not have to be particles which emit a "force". Electro-magnetic Force, is the movement, and alignment of electrons... do your iron filing experiment...... Now drop those iron filings on the floor... did they align? I hope that helped somewhat...
Markus Patients
Markus Patients Pred 16 urami
Gravity is more of an attraction, as with similar proteins. This action can be seen in a bowl of eaten oatmeal filled with water and a bit of dish soap, left to stand or sit for a few hours. You will notice clumping in suspension.
Dalton Chambers
Dalton Chambers Pred 16 urami
If gravity isn't really real then what are gravity waves??? and how do you explain those???
Taylan Antmen
Taylan Antmen Pred 16 urami
Wow man! Thank you very much! The effort, the time, the expertise and lots of skill needed to create this video is overwhelming and you did it perfectly! Not just the educational content but the production, script, editing as whole is as good as the best documentaries can get. Very well done! Keep up amazing work!
Gustavo Weckesser
Gustavo Weckesser Pred 16 urami
Wow you´re smart!!! LOL
Jonathan Bieß
Jonathan Bieß Pred 16 urami
you are a murderer... you just killed my brain...
Marko Djurdjevic
Marko Djurdjevic Pred 17 urami
Gravity force makes me more comfortable after this idk if im expanding flying upwards or want to jump of the building
adam driver
adam driver Pred 17 urami
Question please, if I may? "In curved spacetime you need to accelerate just to stand still" Is there anyway you can visualise this please?
LeftHookOuch McArm
LeftHookOuch McArm Pred 17 urami
More evidence for flat earth. The flat earth disc is accelerating up... when you fall off the roof, the flat earth disc is hitting you since it is accelerating up. How could this happen on all points of a SPHERE AT THE SAME TIME? flat earth: 1 science: 0 🤡
Sara Cooper
Sara Cooper Pred 18 urami
the next time i fall off a roof i will try to picture the ground moving towards me instead of the other way around. i need a video on how the moon does our tides. my head hurts.
Spiritual Scientist
Spiritual Scientist Pred 18 urami
This is easier to understand with Fractal Gear Field Theory
evgeni dimov
evgeni dimov Pred 18 urami
very stupid explanation :(
dog dog
dog dog Pred 18 urami
what about tidal force?
Jason Gillin
Jason Gillin Pred 18 urami
No gravity. All mass and buoyancy!
Denman Fite
Denman Fite Pred 18 urami
Already one error: You're ALWAYS "in" a gravitational field. The extent to which this gravitational field has a meaningful effect on your position, however, is important to note.
PinkySuavo Pred 18 urami
I've seen the quote "gravity is NOT a force" was in Eugene's youtube video in around 14:38: sltv.info/label/m9ls4NPVl5GkmJo/video I higly recommend it!
Samuel Lhermitte
Samuel Lhermitte Pred 19 urami
go check @scienceclick 's video about geodesics. It's in french but it's just one of the best youtube channel. ( I think he launched an english channel ;))
Jean Cédric Huet
Jean Cédric Huet Pred 19 urami
If gravity doesn't exist, then what are gravitational waves?
Anthony Rocco
Anthony Rocco Pred 19 urami
"Earth's gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body. That's what gives you weight. And if you were on a planet with less mass than Earth, you would weigh less than you do here." Direct statement from NASA. I don't know what you are really trying to prove here, it's like a Hippie saying time doesn't exist.
Anthony Rocco
Anthony Rocco Pred 19 urami
Planets have different GRAVITATIONAL FORCES based on their mass and density. The solar system orbits the way it does based on the gravitational forces or the sun and planets. If objects become too distant from the forces keeping them in orbit they leave our solar system because the FORCE is not great enough to keep them inside the orbit any longer. Please explain this "phenomenon" in terms of GRAVITY IS NOT A FORCE. Einstein himself said that claiming gravitational fields did not exist was on of the biggest blunders he ever made.
Anthony Dunn - DCHS
Anthony Dunn - DCHS Pred 19 urami
Here's a silly question: What force is warping the space-time? I guess you can say that mass warps space-time, but by what mechanism (force) does it do that?
Radioactive element
Radioactive element Pred 20 urami
This is the best explanation of general theory of relativity I've ever found. I hate that "ball on a trampoline/fabric" example everywhere. I wondered why that wrong explanation is given everywhere. Now i feel relieved.
Sultana Shanno
Sultana Shanno Pred 20 urami
I literally Watched this Video Twice and Thrice to Understand What Exactly he Is Saying... Yep Absolutely Mind Blowing Concept .. But I knew It Earlier But didn't had a Good Explanation for That. And Thats Why I watched the Video Thrice ... Cause Einstein Once Said ... "If U can't Explain Something Simply, It simply Means That U haven't understood it Well enough..." (Sorry for Changing SomeWords from the Phrase )
bouytt guyt
bouytt guyt Pred 20 urami
If Gravity has no force, why does Jupiter's moon Europa, have huge surface cracks caused by Jupiter's gravitational pull ???????
Matus m
Matus m Pred 20 urami
Someone else saw that? 12:32 ? :D
bouytt guyt
bouytt guyt Pred 20 urami
if space time bends light ,then lighthas noass how?
CyberGolem Pred 21 uro
I believe a missing component in the geodesic pedestrians example is mentioning great-circle/orthodrome distancing. It's inferred but not explained. No mistake, the example is sound, just incomplete. Without understanding orthodrome distancing, two people could walk parallel to each other and never cross paths if they're navigation is a small circle.
05r Pred 22 urami
Can't believe he stole Captain John's spaceship
Wlhlmknrd Pred 22 urami
Am I the only one thinking that he kind of looks like Elon Musk?
Mike Hood
Mike Hood Pred 22 urami
A magnetic field like our earth has ions and ions when right spin absorb into body and left spin ions don't And they repell each other That is the force that is gravity so it is a force just Not well known 🌇🌃
Vishwaas Manjunath
Vishwaas Manjunath Pred 22 urami
Isn't the space time around massive objects curved because of gravity? Or is there another concept/force or explanation video for that?
Jai Sahni
Jai Sahni Pred 22 urami
I like how he keeps reiterating with different examples, that really helps sink in the point.
mike louis
mike louis Pred 23 urami
gravity is north polarity ether field based on the south polarity dominant vibration of earths harmonic mass amplification. It creates an ether pressure differential within all matters south polarity matter dominance, resulting in a magnetic attraction effect. Therefore antigravity can be achieved with monopole electro magnetics. Every twist or turn in the ether causes a magnetic phenomena. Everything is magnetism and matter.
Stefaan Codde
Stefaan Codde Pred 23 urami
Bogus, gravity is a force, fact is all people fly around at incredible speed, those who are living near the poles fly at slow speed, the those who live at the equator at very high speed. Without gravity we would all fly to space; those living in the equator faster then those living at the poles.
Russian Bot_017
Russian Bot_017 Pred 23 urami
Then law of attraction is a myth.
Isuru Senanayaka
Isuru Senanayaka Pred 23 urami
after seen wired s##t like this video, i stared to suspect everything i know for certain. ( everything i though i know for certain )
Andrew Chamberlain
Andrew Chamberlain Pred dnevom
It seems to me that spacetime envelops the globe, because no matter where you go on the planet the acceleration's the same.
ziz nator
ziz nator Pred dnevom
think of gravity instead of as the density of space and the curved space analogy gets easier to understand since it removes that visual problem of the curved sheet example. rather than space being curved like a sheet, you experience more space around objects of larger mass because they themselves are more space. as you travel in a straight line "experiencing" space you experience more space in the direction closest to the object of mass basically like a wave traveling through a varying density of air.
RandomClick Pred dnevom
So thermodynamics is a lie too?
RyllenKriel Pred dnevom
Gravity is a force until it's not a force unless it is a force, but let's not force the issue. Gravity matters only in the presence of matter, but that's relatively relative to relativity!
Ajay Singh
Ajay Singh Pred dnevom
If it is true then why a start collapses into itself when it run out of fuel? And become a black hole
Kamal Sharma
Kamal Sharma Pred dnevom
if space time bends light ,then lighthas noass how?
Yogendra Bijwe
Yogendra Bijwe Pred dnevom
How many times is he going to change the thumbnail of this video
Greg Bayley
Greg Bayley Pred dnevom
There are 2 factors at effecting a moving particle. Newtons Gravitational Laws and Einstein’s laws. The author gives me the impression that he is trying to convince us that Newton’s laws are now void and irrelevant.
Greg Bayley
Greg Bayley Pred dnevom
Continuation of my previous post: I think very large masses effect the trajectory of very small masses as well as the factor of relatively. On earth, if someone came and sucked out the iron core of our planet many things would happen. Putting all other catastrophic, apocalyptic events, went you went to bed and weighed your self on a spring scale you weight 200#s. After your morning coffee and a good health dump you were down to 45#s. That’s a Newtonian change. On the moon you weigh 35#s. That is Newton not Einstein. If it took you 3 months to get to the moon and back you supposedly were now 3 months younger. That is Einstein. Your DNA has decomposed and your bone structure looks more like your grandmother’s according to the Russians. I hope that makes it more confusing. It took me 2 years to get through one year of under graduate physics. I decided to skip the theoretical gibberish and became a “guess and test” engineer.
Identity is character not group
air resistace tho
Which Way Is Down?
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