Why Gravity is NOT a Force

25 thoughts on “Why Gravity is NOT a Force”

1. 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.

2. Cosplay muppet science, Einstein blah blah blah

3. guys,take it easy.it's all just theory

4. so essentially, just think "Woo hoo this is great, I am weightless!" for the few seconds before you go splat on the ground. I will remember that 😁

5. If gravity is not a force, them how weight varies from one planet to other?

6. Explains Alice in Wonderland.

7. This great. All we have to do is stop the Earth. Then I can step off? Right?

8. ur th best

9. 2:31 Are these two people the same?

10. But since the man who falls of the roof experiences drag he doesn't feel weightless right

11. Drinking rum & Cokes while watching this video is what Isolation is all about.

12. 4:43 Flight mana telugu states lo start ayyindhi prndss 😂

13. You gained these understanding most Q's chap! gravity is NOT a force, not a prism, not barrier, not a shield to be a Force, its a BOND, between two or more things, the more, the more they rejoice, the conslustion of travel (imagenation like), a straight line that has an A to B segment point, is a bond, thus the most natural non instigated action result would be, that those Q's will rejoice to each other, if only two objects traveled oppisit direction of each other in a straight line(like a two way vehicle in traffic) out in space. What do you think will happen after a few eternities? They will parabolic back to what we call in a symbole drawing shape, INFINITY,. Evetually rejoice in a bond. That being said, take in Q: Gravity Is The Bond Between Two Or More Elements.

14. Okay, but why don't we fall experience the acceleration of the universe from its center when we are in freefall, then?

    If freefall lets us be a universal observer, then why does only the ground come up to meet us instead of up and away?

    The space station move in a helix to maintain its path around our curved space time on earth, and presumably so too does our earth around the sun, and our sun around the center of the milky way, and the milky way in relation to the greater universe at large.

    So if gravity isn't a force, because free fall makes you a universal observer, why doesn't the earth just shoot out from under our feet when that happens and leave us behind?

    I imagine we travel an absurd constant speed to orbit the sun in a year, and the sun likely bears an absurd speed to maintain its orbit around our galaxy.

    If we become a universal observer why wouldn't we watch and realize all of that, during free fall?

    It's confusing me.

15. The videos talking about 4th Dimension Tesseract , although geometrically and conceptually correct ,you think violates the einstein 4D spacetime (max speed all directions is c, ds agreed by all moovers,.. ), or could be possible? As they move one 4D space object on time, they talk really in a 5D spacetime environment.

16. It’s not even real….. no such thing… complete nonsense

17. Thanks veritasium

18. At even 9th grade we were tought newtons prespective of gravity..had no idea that we lack alot behind..

19. Is this principle of equivalence?
    Where Einstein thought that gravitation and acceleration are equivalent.

20. So how do UFO's fly?

21. Contradiction: you can't be an initial observer according to your theory. We still "fall" towards the sun and towards the center of the galaxy.

22. Better not tell the scientists who found gravitrons.

23. So, but, what if I',m standing in the center of the Earth? What do I feel?

24. It’s pretty sad that in 2020, people really still think space-time curves around an object and not towards an object. Wake up man, gravity pulls things inward 🙄

25. I noticed one problem, and correct me if I'm wrong. There is one way to tell the difference between being weightless in space and falling due to gravity. In space, if you push an object, it will continue moving in that direction until something stops it. If you're falling due to gravity (with no air resistance), the same is true if you push an object perpendicular to the direction of gravity, but not if you push it parallel, ala, up or down. It will move a little bit but then return to the rate of acceleration due to gravity, or "stop" according to your inertial reference frame.

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