Why Gravity is NOT a Force

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 CasΓ©ta 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 NLcameras channel: ve42.co/gfl or his books: ve42.co/GFLbooks
Amazing VFX, compositing, and editing by Jonny Hyman
2D animations by IvΓ n 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


  1. Veritasium


    6 dagen geleden

    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.

    • Aqdas Ahmad Khan

      Aqdas Ahmad Khan

      12 uur geleden

      Thank you for this wonderful video. I was searching NLcameras since months and now you made me understand. Watched 2 times to understand and in future I will again come to this video.

    • Non Sicuro

      Non Sicuro

      2 dagen geleden

      I had to stare at it for a solid 2 hours before i got it

    • Adonai Blackwood

      Adonai Blackwood

      2 dagen geleden

      @K.L. 🀯 amazing question! I think its because of the air/enclosed atmosphere on earth...and a free-falling person would interact with that "material" and it would feel that opposite friction from the air like a force against their skin & hair, etc... I've had to watch this video several times & surf thru some comments to get a lil bit of perspective. It’s a dizzying topic, but very interesting nonetheless!

    • Gol D Roger

      Gol D Roger

      2 dagen geleden

      Then why on the opposite side of the Earth don't feel they are left behind and floating in space?

    • Jim Larsen

      Jim Larsen

      2 dagen geleden

      Tell us. I know you think you understand what you thought I said, but what I said was not what I meant. 😞

  2. earlgrey


    3 minuten geleden

    That was the biggest pile of scientific bunk I have ever seen. I feel like the kid who said the king had no cloths.

  3. Xaeus Borg

    Xaeus Borg

    12 minuten geleden

    Gravity is a Tension, not a Force. Now I'll watch the video.



    12 minuten geleden

    Isn't it ironic that space time can be represented in a spiral form of a helix. And our DND is also represented as a double helix also. Everything that exists on earth , also exists everywhere in the universe. The earth is accelerating in a spiral at a rate of 9.8 newtons. Gravity is accelerate motion

  5. Shubham Das

    Shubham Das

    17 minuten geleden

    Why and how matter curves spacetime ❓

  6. Shouryaveer Mehta

    Shouryaveer Mehta

    22 minuten geleden

    Can you please also link the other videos of yours related to this in the description (particularly those that are featured in this video)

  7. Vikas Dhiman

    Vikas Dhiman

    26 minuten geleden

    After watching this video, I'm feeling under me that something really pushing me upwards rather than a gravity that pulling me downwards.

  8. Sagnik Banerjee

    Sagnik Banerjee

    36 minuten geleden

    16:57 He sabotaged the lights..

  9. Иван ΠŸΠ΅Ρ‚Ρ€Π°Ρˆ

    Иван ΠŸΠ΅Ρ‚Ρ€Π°Ρˆ

    38 minuten geleden

    Hey, Derek. Great video, first of all. I have a question, how does this fit in with the discovery of gravitational waves in 2015? I'm 3 years into uni (astrophysics) and the professor is talking about gravitational waves in a very Newtonian fashion. Hope you see this, thanks!

  10. No Body

    No Body

    43 minuten geleden

    @ Veritasium >> Methinks you fail to realize the gravity of this topic!

    • No Body

      No Body

      33 minuten geleden

      BTW, I subscribed! I was impressed with how stupid you proved me to be!



    45 minuten geleden

    You changed my perspective of the world

  12. greg55666


    46 minuten geleden

    I don't see the proof that gravity is not a force. I get all the relativity stuff, but not how the means it's not a force. In other words, it seems you fail to explain why "inertial frames of reference means no field." Also, how/why is electromagnetism different than this?

  13. Andrey Lebedenko

    Andrey Lebedenko

    46 minuten geleden

    I can measure the red/blue shifts of the CMB and this way I can tell whether I'm moving or not.

  14. Marije Bijl

    Marije Bijl

    46 minuten geleden

    Well, I feel inertia, for sure!

  15. Parth Joshi

    Parth Joshi

    52 minuten geleden

    So i looked up and it occurs that no, an accelerating charge(stationary with respect to ground), does not emit radiation. But it should, right? Or is it that we measure the radiation using equipment that is also in same state as the particle and hence no radiation is observed?? Then, but this also means that radiation emitted is also relative. That seems weird to me! Edit: I read the resolution given by Rohrlich and now has a general idea why we do not observe the radiation. But can you explain this using your methods(which are very understandable to me :-) )

  16. Kate hardy

    Kate hardy

    54 minuten geleden


  17. Parth Joshi

    Parth Joshi

    58 minuten geleden

    So using this concept, can you make an explanatory video regarding things like satelite orbits and other similar topics? Or suggest a place to learn it??

  18. nrgins


    Uur geleden

    If gravity is not a force, and a satellite orbits the earth only because space is curved around the earth, and the satellite is actually going in a straight line, then that makes total sense. But it doesn't explain why the satellite is eventually pulled to earth. If there is no gravitational force pulling it in, then it should just continue to orbit at the same height indefinitely. Or, if it runs out of momentum, then it would just stop. For gravity as curved space to pull the satellite in, one would have to go back to the curved-well model, where the ball eventually falls into the well. But the videos rejects that model as being misleading, because it implies that gravity is a force. So if there is no force acting on the satellite, then what makes it eventually be pulled into earth, instead of just remaining on a curved trajectory indefinitely?

  19. Nick nack patty wack show

    Nick nack patty wack show

    Uur geleden

    Oh ya I needed this. Mmmmmmm. GOOD knowledge

  20. L Jena

    L Jena

    Uur geleden

    This is truly a masterpiece. This is the reason why we need educational content on YT, so that we can know that the rules of physics are changing and not all of the theories we study in our curriculum hold true.

  21. Rafael Rahman

    Rafael Rahman

    Uur geleden

    Okay from 8:27 Newtonian physics tells that I do a gravitational force on the floor and the floor does the same force but in opposite direction to me, so I don't accelerate. But in general relativity, if there is no gravitational push, then how come the floor is still pressing a force on me? How is it I'm accelerating now? I just didn't understand, if anyone could help :)

  22. Wolfy Kitty

    Wolfy Kitty

    Uur geleden

    This video made me cry and I can’t explain it

  23. Andrew Seba

    Andrew Seba

    Uur geleden

    Took 101 years for me to see that photo of the eclipse.

  24. Wolfy Kitty

    Wolfy Kitty

    Uur geleden

    I love the dedication 🀩 this man went to space for a video and cloned himself 🀩🀩🀩🀩🀩🀩🀩🀩🀩🀩🀩🀩

  25. Jan Bohm

    Jan Bohm

    Uur geleden

    So the stars are not where we except them to be

  26. Stefano Stankovic

    Stefano Stankovic

    Uur geleden

    I loved this video ❀️ please keep this theme of playful learning, especially the rocket .πŸ˜‚

  27. Matthew Geiger

    Matthew Geiger

    Uur geleden

    But doesn’t matter bend space time so doesn’t that mean that it’s a gravitational force!

  28. mousesanya


    Uur geleden

    Ok, no Gravity force. It's quite understandable. But the main question - Why does mass create this space-time curvature then? And Why do scientists searching for gravitons?

  29. Stefano Stankovic

    Stefano Stankovic

    Uur geleden

    5:04 Google is crying now. Are you happy πŸ˜‚

  30. gpreux


    Uur geleden

    I'm absolutly not contesting the General Theory of Relativity, but I'm wondering two things: - Einstein started developing the theory based on the fact that when someone experiences a free fall, he doesn't feel any force. But considering that each atom of our body is attracted the same way by gravity, if it were a force, don't you think we could feel any force on our body anyway during a free fall? - One often talks about spaghettification of an object getting to close to a black hole. I would expect that if this is due to a distortion of spacetime, a spaghettified object would just appear that way the same way we can do an affine transformation, but would not feel anything. Whereas if it is a force, the difference between the extremities would destroy the object. Thanks in advance for those of you who can help me better understand these two cases.

  31. Pip Grace

    Pip Grace

    Uur geleden

    As the planet glides through space, it's flow - guided by every other curve accelerates.

  32. Pip Grace

    Pip Grace

    Uur geleden

    I think it makes sense that an accelerating particle would give off electromagnetic radiation. It's like static electricity. Planets create a whooole lotta static energy careening through space! When are one of you knowledgeable types gonna do an Episode on Quartz Crystal?

  33. Truvuz


    Uur geleden

    If Gravity is not real, what force curves the spacetime around massive objects?

    • Truvuz


      45 minuten geleden

      @Jesse Newton is the curvature the effect and gravity causes it? The guy in the video says gravity is an illusion. An illusion causes spacetime to curve?

    • Jesse Newton

      Jesse Newton

      Uur geleden

      @Truvuz Gravity IS the curvature of space time

  34. Cole Sweeten

    Cole Sweeten

    Uur geleden

    im only 14 but in wuld be cool to meat destin from smaterevryday and the action lab and vertaium in irl i love science

  35. girish biradar

    girish biradar

    Uur geleden

    You lost me at that mathematical equation

  36. troy stiles

    troy stiles

    2 uur geleden

    Gravity is a lie , bouyancy a density are the physical laws that pertain to downward force , SPACE IS A LIE !!!!!!!!!! WHAT DOES FIRMAMENT MEAN , ENJOY YOUR LIES while there is still time . Space is fake all images are CGI

    • Jesse Newton

      Jesse Newton

      Uur geleden

      You’re cgi

  37. Thicc Krump

    Thicc Krump

    2 uur geleden

    Well there are no straight lines in nature, only curve-linear.. gravity would be non-point specific dielectric acceleration. It is not a force. Field theory looks at these problems, I'm still baffled as how people still think gravity is a force πŸ˜‚. General relativity gives "general" picture of the world.

  38. Yogesh Tiwari

    Yogesh Tiwari

    2 uur geleden

    so this is why fruits fall on ground, i mean the ground accelerates towards the fruits since the beginning of it, but when its ripe, its not as much attached to the tree, and once the tree let it go, Bam, the ground slams into the fruit...

  39. Smear


    2 uur geleden

    well it's just a different way to think about it honestly

  40. Gioacchino Alessio Capizzi

    Gioacchino Alessio Capizzi

    2 uur geleden

    I am thinking about electromagnetic radiations as gravity force: what if we discover that the electromagnetic radiations it is a misconception because it happens just relatively to our perception? Within the reality of relativeness, the perception of something is everything to what is meaningful.

  41. QWERTY Tango

    QWERTY Tango

    2 uur geleden

    This has just rekindled my interest in physics.

  42. Preston Stone

    Preston Stone

    2 uur geleden

    Super interesting. I have a question. What causes spacetime to bend? The whole video I was having difficulty accepting the absence of gravity because my assumption was that gravity was bending spacetime.

  43. Matheuskbr


    2 uur geleden

    Na espera da legenda em portuguΓͺs

  44. Zywl


    2 uur geleden

    If gravity can be understood as a distortion of space-time, magnetic fields can be considered a distortion of something?

  45. AKASH K


    2 uur geleden

    Legends say if you are watching veritasium during your online lectures you're gonna make difference. πŸ€™πŸ€­

  46. musicm61


    2 uur geleden

    the graviton is the most essential element in the universe, The most fundamental of all elements in the universe is undeniable. The graviton is the only boson that can exist without any adjoining quarks and that alone through entanglement makes it the most important boson in the creation. the reason there is no light coming from a black hole is as the elements get closer to the enormous amount of entangled gravitons all quarks are ripped from their bosons, so photons no longer exist nothing exists yet the only boson that does not have adjoining quarks survive.

  47. Niklas


    2 uur geleden

    Great video! Just want to let you know that "Einstein" is actually pronounced differently (I am German...) in fact the "st" is pronounced like "shhht"

  48. fox dos

    fox dos

    2 uur geleden

    STOP!! falling man cant experience weightlessness, how could he /she plumitting toward the ground . How much heavier could you feel.so i contest Albert and say no, falling from a building and floating in space are very differnt. gravity isnt a force, there is only really one force , lets call it God Force, or just the force. Gravity uses that force to work , same as electromagnetics or electrogravitics or both strong and weak nuclear .

  49. Eziman96


    3 uur geleden

    Gravity...so I still have to spend certain amount of energy just to counter this illusion..say like to stay in orbit. πŸ€”

  50. john wayne

    john wayne

    3 uur geleden

    Just at the moment, while the rocket accelerates (and /or changes the direction), the pilot WOULD recognise that, while bouncing or smashing to the hull. This phenomena is called inertia.

  51. RPK


    3 uur geleden

    This is a hypothesis.

  52. Sean Sanford

    Sean Sanford

    3 uur geleden

    Question: On the moving forward while standing still part. Is it the case that time moves forward, away from mass and that falling is just being left behind in TIME? So while standing on Earth, the Earth is pushing you through time at the speed you would be falling in it's gravity?

  53. Marcell KristΓ³f BΓ©kΓ©si

    Marcell KristΓ³f BΓ©kΓ©si

    3 uur geleden

    Phoebe be like: I KNEW IT!!!!

  54. Darshan Phy

    Darshan Phy

    3 uur geleden

    Why is this video's view still stuck at 3.4M.

  55. Bilbo Baggins

    Bilbo Baggins

    3 uur geleden

    Question: If I am in a spaceship in an orbit around the planet, that is only stable, because the ships thrusters keep accelerating it. Will I be pushed to the bottom of the ship (where the thrusters are)?

  56. Steven Morgan

    Steven Morgan

    3 uur geleden

    they use this for training astronauts in planes controlled descent for getting used to weightlessness.i guess we still don't know what causes gravity at one time it was considered to be the mass of the planet and control spin then it was theory it was the planet's core of iron which causes a magnetic field.now they saying gravity is caused by waves.

  57. Mo Rafiee

    Mo Rafiee

    3 uur geleden


  58. mrsiecosie


    3 uur geleden

    There is always resistance even in space.

  59. mrsiecosie


    3 uur geleden

    My theory is that we if space is a vacuum and gravity is not a force time is constant. When we enter space from our planet we are moving. The universe is also moving. So what is actually still? If we were still. The universe would just fly by us.

    • Jesse Newton

      Jesse Newton

      Uur geleden

      Everything is relative. Speed, acceleration, and time are all relative.

  60. jarcher


    3 uur geleden

    This video raises the question of why we still teach children about gravity 'pulling' objects towards it. The analogy of dropping a ball is often used to explain it. As a former teacher, it was hard to explain this as it wasn't logical. The immediate response from children is 'How is the Earth pulling the ball down?, which is a valid question. However, this explanation is logical; the ball isn't moving; everything around it is, including you - the observer.

  61. el Bond

    el Bond

    3 uur geleden

    Surely no one should be re wiring their light switches by themselves? Awesome vid otherwise.

  62. Berndt Barkholz

    Berndt Barkholz

    4 uur geleden

    What nonsense... every normal educated person can understand that the principle of equivalence is an illusion and that gravity IS a force... what do you feel carrying a 10 kilo load... a warped space... or a force pulling in your arms ? Veritasium... I thought of you as an intelligent person ! The so called "free fall" (hej, a FALL is always limited in time, but not an orbit around earth !)... further are you in an orbit in space moving 90 degrees to the gravitational fall lines, when you fall from the roof you move with the gravitational fall lines... You are spreading nonsense my friend ! A man falling from the roof IS accelerated... are you blind... or just a foolish BELIEVER ?!

    • Jesse Newton

      Jesse Newton

      Uur geleden

      Gravity is not a force, it is a property of curved spacetime. When you fall off a roof you are following curved spacetime, not a gravitational field. Also, speed and acceleration do not exist if you have nothing to measure it against. It is all relative.

  63. Nerumanil


    4 uur geleden

    Yes it is true that Gravity is nit a force like the the electromagnatic force but the way you explained it was wrong!

  64. Abdul rahman El Chammaa

    Abdul rahman El Chammaa

    4 uur geleden

    You could also just say the word force is an illusion. I think you are confusing annotations with the practicality of how we are. in this universe that is. If we look at the example of us standing on our feet. Whether we like it or not, we are exerting a force to keep us on our feet. This force can be also equated to the amount of energy we are burning in our body in order to stay put on our feet. This energy thus can be equated to the instantaneous force required to stay on our feet. now what is this force countering then? call it gravity or whatever. or call it force or whatever. Nothing is a force anyway, but rather phenomena of the universe, or the earth we live on, exert a force, one of these is gravity. Saying gravity is not a force is like saying a rocket is not a force. Ya well neither are forces. They exert forces.

  65. Patrick Chen

    Patrick Chen

    4 uur geleden

    13:14 why does an external observer (presumably stationary) see a straight line of light? The rocket would still be accelerating, so if the light lags behind after being fired, wouldn't an external observer also see a bent line of light?

  66. Space Cadet

    Space Cadet

    4 uur geleden

    Cute ship. Did you consider mass producing them for sale?

  67. Randy Ortega

    Randy Ortega

    4 uur geleden

    Then what holds the moon to orbit the earth without gravitatinal force? Same with the planets orbiting our sun. Are you trying to tell that Isaac Newton is incorrect?

    • Jesse Newton

      Jesse Newton

      Uur geleden

      Gravity is a β€œproperty” of curved spacetime. A massive object like a planet curves spacetime. The moon is essentially β€œfree falling” into the earth.

  68. Smackdab smackdab

    Smackdab smackdab

    4 uur geleden

    So your frame of reference doesn't move but does everyone have the same sized frame of reference?

  69. Edward Ingram

    Edward Ingram

    4 uur geleden

    So if there's no force of gravity, what compels a mass to go to the bottom of a spacetime warp?

  70. Camque The Blue Cat

    Camque The Blue Cat

    4 uur geleden

    e e e everything i have learned is a LIE

  71. Anthony Paull

    Anthony Paull

    4 uur geleden

    I see you've been channelling your inner Everyday Astronaut

  72. Rajdeep Purkayastha

    Rajdeep Purkayastha

    5 uur geleden

    Gravity is not easy to explain, but you explained it so amazingly plus you have put so much effort into making this video is just commendable. Loved it. ❀

  73. Luc Gauthier

    Luc Gauthier

    5 uur geleden

    All my house is ContrΓ΄l by Lutron smart switch, it’s working very well. You can do IFTTT with them , that’s very clever.

  74. Sourabh singh

    Sourabh singh

    5 uur geleden

    I think you distroyed the dimensions concept as well... πŸŽ‰πŸŽ‰πŸŽ‰

  75. Kshitij


    5 uur geleden

    11:37 why I didn't ask this question to my physics teacher

  76. TrumanHW


    5 uur geleden


  77. 3 Pizzas to go

    3 Pizzas to go

    5 uur geleden

    Watched for the first time, 99 to go



    5 uur geleden

    Space and time 2 concepts πŸ™Œ πŸ˜‚πŸ€£πŸ˜‚πŸ€£ even einstein new he was referring to a concept... what deluded sheep. πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ¦„πŸ¦„πŸ¦„πŸ¦„πŸ¦„πŸ¦„πŸ¦„πŸ¦„πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘

  79. Andrew


    5 uur geleden

    Great video, one question, what is causing us to be constantly accelerating?

  80. ruffex


    5 uur geleden

    Throwing your helmet like that will render it unusable

  81. Marlon Cornejo

    Marlon Cornejo

    5 uur geleden

    so basically non sentient matter have perception and are aware of their surroundings? or is matter actively responding to an effect of their surrounding because of a change within their own field/dimension?

  82. A.C. J.

    A.C. J.

    6 uur geleden

    @Veritasium Okay, okay, okay. I will consider gravity is no more, it is all acceleration, so: a)What about magnetism, is that an illusion, too? b) Also, all objects spinning are throwing things off them, not into them, so why aren't we being elongated and thrown off Earth? c) Earth spins at 1670km/h = 0.4638km/s, meaning if I jump for 1 second, I should stay still, while Earth will move beneath me for 0.4638 km. Why doesn't it happen?

    • Narf Whals

      Narf Whals

      5 uur geleden

      a) kind of. Magnetism is a relativistic effect of electricity nlcameras.info/wiki/aoqwg5540Ye9sGU/video b) earth's spin has a minuscule effect at the equator, you are very slightly lighter at the equator than at the poles. The spin is not what causes the acceleration, the electromagnetic interaction between the atoms in the ground and your feet is. c) for the same reason you don't get left behind when you jump in a moving bus. You are already moving the same way as earth's rotation and that momentum is conserved.

  83. Manoj Kumar

    Manoj Kumar

    6 uur geleden

    Hi Veritasium. Your explanation is simple and precise. I would like to suggest you to add gravitational waves with your explanation . Thank you

  84. GD lifesteal

    GD lifesteal

    6 uur geleden

    hey thats the explanation flat earthers used to show how gravity would work on a flat earth. guys veritasium is a flat earther

  85. MD


    6 uur geleden

    What about the tidal forces?

  86. ChompChompNomNom


    6 uur geleden

    If the floor is accelerating upwards, why doesn't the floor fly up?

  87. MVP_KZ


    6 uur geleden

    Mind blown, are they really twins? :)

  88. hero hero

    hero hero

    6 uur geleden

    Trust me it went over my head despite how well this guy is explaining.

  89. Oscar Dziki

    Oscar Dziki

    6 uur geleden


  90. Jack O'Toole

    Jack O'Toole

    6 uur geleden

    Would this theory be invalidated if you were in space moving at a constant velocity and sucked into a black hole, you would still be a body travelling at a constant velocity, until you go in (assuming feet first) then your feet accelerate at a different rate to your head as you pass the even horizon?

    • Narf Whals

      Narf Whals

      5 uur geleden

      @Jack O'Toole Your feet and your head are still both inertial frames, just not the same one. They try to follow different geodesics because the curvature around a small black hole is very different across small patches. That is what causes tidal forces.

    • Jack O'Toole

      Jack O'Toole

      6 uur geleden

      What I meant to say is surely you can prove gravity is a force: as you approach a large body of mass you accelerate towards it. Your frame of reverence is inertial right up until you hit it. Whereas if the body of mass was a black hole your frame of reference would no longer be inertial as your feet would accelerate at a differing rate to your head (assuming you went in feet first). If anyone could clarify that I’d be much appreciative πŸ‘

  91. Chakravarthy C

    Chakravarthy C

    6 uur geleden

    Ocean is not a force either. .

  92. Narayan lfalee

    Narayan lfalee

    6 uur geleden

    bwain feel big got

  93. Chris D

    Chris D

    7 uur geleden

    "Are you watching this in an inertia frame reference?" _Jumps on my bed_ Yes.

  94. michael burkhardt

    michael burkhardt

    7 uur geleden

    at some point the guy will have touched the inside of the space capsule as it changed course. just a brush of a sleeve on the interior to keep him centered in the capsule is displacement; force vector

    • Narf Whals

      Narf Whals

      5 uur geleden

      He doesn't need to be centered because he is accelerating at the exact same rate as the rest of the rocket. Nothing inside the rocket tells him there even is a planet.

  95. Quang Tuan

    Quang Tuan

    7 uur geleden

    you are pretty cute mate :*

  96. Biruk Ephrem

    Biruk Ephrem

    7 uur geleden

    Check this video. A more elaborated version of this video. nlcameras.info/wiki/sKjcl4GhqIW_uJg/video

  97. Uncanny void

    Uncanny void

    7 uur geleden

    It makes sense, also I'm very curious on perspective. A different Perspective can change the whole world view. I question most of what I study and some of what I study instinctively feels wrong to me and I feel stupid to ask my teacher of everything because the replys to my questions are mostly questioning my view point rather than trying to explain it. (I feel stupid for trying)

  98. Som Abhisek

    Som Abhisek

    7 uur geleden


  99. yousaf sohail

    yousaf sohail

    7 uur geleden

    You Explained it very Well... This video is a master piece for School & college students to understand the Gravity...!

  100. GKE


    7 uur geleden

    But wait - why do astronauts onboard the ISS feel weightless when in fact they are in a constant free fall?

    • Narf Whals

      Narf Whals

      4 uur geleden

      Because you are weightless in free fall. That is the happy thought.