Is Gravity a Force?
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- Опубліковано 29 сер 2024
- Albert Einstein taught us that gravity is not a force. But what does this really mean? In this video I explain the difference between mass and weight, and how Newton and Einstein differ in their notion of "acceleration" and "force". The difference was indeed well illustrated by Einstein himself in his famous thought experiment of the elevator, that is the basis of the equivalence principle. Don't know what the equivalence principle is? Don't worry, I explain that too -- and all in only 4 minutes.
Support me on Patreon: / sabine
Who doesn't plan to visit a black hole? I know I do!
So how do you do that planning?
Are you sure you plan to... maybe you just hope to?
@@ZeroOskul It's the very last item on my bucket list.. :)
@@tungstikum Well, good luck!
u might as well go see the unicorn in the fantasy ZOO along with the griffin because the big bang dark matter and black holes are not real they are theories that in the future will be proven to be false, the big bang and expanding universe didnt happen(Red shift is false, Halton Arp), black holes are Z-Pinches on a galactic scale that create a plasmoid at the center of the galaxy(Wallace Thornhill), and dark matter the 95% of the missing mass of all galaxies that hold them together and make them spin at the same rate is what we in the ELECTRIC UNIVERSE call Dark energy in the form of Plasma energy in what we call DARK MODE PLASMA its all a dance of different electrical affects that drive this universe,,, FROZEN MAGNETIC FIELDS IN THE DEPTHS OF SPACE,,,,, WTF ??? what demented moron thought that up ? ,,,, we all know in physics to make a magnetic field u need to make massive amounts of energy flow through an object or through space itself to create magnetic fields without that flow of charged particles u will not have a magnetic field in space,,,, gas clouds in space are not the same as a magnet that is made on the earth,,,,, thats the mistake that all u cosmologists cant seem to figure out,,,,, WAIT 5 MINS and we will see someone in the field of cosmology say "WE ARE SHOCKED AT WHAT WE ARE SEEING" ur papers are filled with these types of comments,,,,, Take Comets for instance Sabine Hossenfelder what do u say a comet is and lets make it easy take comet 67P/Churyumov-Gerasimenko because we have some awesome images of it now WHERE IS THE ICE OR SNOW ???? its a rocky body being eroded away electrically there are no masses of ice just under the surface and the jets we see are reproducible in the vacuum chamber here on the earth in a lab,,, they say the jets stop when the sunlight stops touching the surface as it rotates,,,,, but we see in the nasa images that thats not true there are these white areas on the comet on its dark side thats more proof of electrical etching,,,, as in the moon IO's so called volcano its not that again is an electrical discharge,,,,, if it were dust and debris in an atmosphere we would not be able to see through it rather in that image we can see through that so called dust cloud that my friend is an electric discharge in glow mode as are the etching out of comets
@@shockwave326 gryphon.
"If you wanted to be very annoying, I mean very accurate." :P . That's a jewel, right there.
Just see my comment here agreed
"Pedantic" might be the term she didn't know the word for.
@@michaelhutson6758 : (nah, too international, appears in dozens of languages including German: "Pedantisch")
@@michaelhutson6758
Or, 'rigorous.'
Michael Hutson she might not need vocab lessons from randoms in the comment section
Best physics lectures on UA-cam - simple, direct, informative and expertly explained.
Gravity could be considered as a force, but not that Newton and most of scientists thought !
Newton [and most of scientists] made confusions, but Einstein [and his fans] was [are] completely wrong !!
I'll prove it soon.
Greetings from Paris.
professeur essef, in mathematics (active for over a year on UA-cam and Wikipedia, in astronomy and astrophysics)
@@lecinquiemeroimage "Einstein [and his fans] was [are] completely wrong !!
I'll prove it soon." Good luck with that.
@@bartonpaullevenson3427 It's already done!
P.S : I also remind you that general relativity had been undermined by the famous French mathematician Jacques Hadamard, a century ago (please go to google, and type "general relativity - question of the singularity").
Sure, but I never got the answer! So is it a force or not?
@@prof_huNever, because nobody knew gravity! In fact, it's a pressure, which becomes force comes into contact with any mass body. I'll say more later, in my last future conference in astrophysics.
The way she correctly pronounces Einstein's name is so satisfying...
And for people who don't know the correct pronunciation, hearing the correct pronunciation is so annoying. It's weird ain't it?
Everyone who knows basics of German pronounces his name correctly.
It irks me when people talk about Harvey Weinstein and say "wine-steen"
@@Kyrelel An easy way to remember is to remember how Bruce SpringstEEn's name is pronounced and how that is pronounced differently from stEIn (for those who always get confused)
It's easy for her, as she is German.
Glad you're feeling better, Sabine!
Thanks :)
@@SabineHossenfelder
Did you make an experience like this one to loose weight ?
ua-cam.com/video/ECNGHWpiX7w/v-deo.html
@@SabineHossenfelder you're very pretty in this video by the way
You filmed this speech with no cuts. Impressive
I did! Lucky day!
@@SabineHossenfelder No, luck has nothing to do with it. It's because you're sharp as a whip. 😉
And no annoying, distracting, unnecessary (usually bad) background "music" to obstruct the reason why I came here - for the SCIENCE.
This lady is terrific.
Oh, and by the way, I am a musician as well as a man of scientific/mathematical learning - so I love good music, in its correct place.
@@davidbrown8763 yes-yes-yes! being a musician the ever present "background" music makes me mad! There are videos with really interesting content that I can not watch because some stupid music is just to distractive or interfering. And think about it: This is music that should not be listened to! How absurd is this...?
@@SabineHossenfelder
Have you seen the experiment where someone filmed the movement of light and slowed it down like a trillion frames per second?
And when they played it back light was still moving.
That's fast!
Bravo!!! So clear, simple, and straight to the point. You are indeed the physics teacher every dull head should have. 🎉❤😂
When I read the comments of Sabine's videos, I pronounce Einstein in her voice.
Is there any other way ? :)
In her voice, or with her accent? With the thoughts in our heads? (actually no ones "voice"). Just being precise :-)
I have that with the word matter. She says it as if it doesn’t really matter, or if she doesn’t really know what’s the matter about matter. 😃
She´s pronouncing it correctly. As it is a german name, the "s" before the "t" is spelled "sh". No accent here.
@@esteelvauce7288 I could be wrong but it probably depends on which part of Germany you come from.
This is one of the best explainers I've seen on YT. Thanks! And I love the superdry humour :D
With according curves!
It’s a poor description, she fails to explain how the spacetime mechanism makes us drawn to the earth.
@@jaccounts4659 Correct & planets are 3 dimensional, with mass warping space. So, gravity is a force & the basics of multi-dimensional space-time.
@@michaeljones7465
Gravity is no force. But you need a force to stay still inside a gravitational field.
explaination: (doppler-effect)
If you are freefalling and you see light from the bottom coming towards you, you would not see a redshift. But if you are stationary on a tower and look down you would see the light slightly redshifted.
Now here comes the thing, if you are floating in space and light comes towards you, you dont see redshifting. On the other hand if you accelerate with a rocket away from the light you would see it redshifted.
If you compare the four scenarios, you can see that staying stationary on earth is like accelerating with a rocket ship in space and if you freefall on earth its like floating in space with no force on you.
This shows, that gravity is no force. It is just a movement of the spacetime towards the center of mass.
The only force you experience is the force of the ground pushing you against the movement of space-time.
So what causes the "force" according to Newton. The graviton doesn't exist so.....
Once again Sabine gives a brilliant explanation. Indeed Sabine has the ability to present a variety of problems in physics in the most clear way, so go ahead
"Once again Sabine gives a brilliant explanation."
She doesn't know what she is talking about.
it is bad enough that she has a messed up interpretation, but it is even force that he totally falsely claimed Einstein backed her nonsense. He said ovr an over that gravity is a force.
love how she says Einstein
It's the German way of saying Einstein: Aynshtayn.
Einshtein.
@@NowhereNear42 isn't that name of German origin?
@@freenational It is. The meaning is: one (or single) stone.
@Robert Burley Ineshtine. Ulbaird.
I must say in the name of science, that dress looks fantastic.
I had a Math Prof. that was a super tall & blond AND extremely attractive. Needless to say, I was NEVER late nor absent. Her Swedish accent helped to hear the equations.
not better myself
She is stimulating me intellectually and physically. It’s a win win.
not being annoying, but the dress is almost fantastic. the fit makes it fantastic.
Seems like everyone on this post wants to see the effect of gravity on the dress.
This is very helpful. Life on Earth kinda gets me down lately,so I'm planning on a trip to the nearest blackhole this weekend.Thanks a bunch.
I've recently discovered your videos and they are really excellent. Have you ever considered a video about Verlinde's argument of gravity as an entropic force? Would be really interesting to listen to your views about this topic.
Loved the dry humor, you just won a subscriber :)
In order to be unified with quantum theory, gravity needs to be a force. But if it is a force, then it has to be transmitted by a gauge boson (call it a “graviton”).
However, such particles cannot travel faster than light. And in a black hole, even light cannot escape. Therefore gravitons also cannot escape a black hole. But if gravitons cannot escape a black hole, what propagates the gravitational attraction to the outside of the black hole?
Just do the wavefunctions in curved space-time, ez :)
Gravity is a force rather than a curved spacetime for multiple reasons.
You need to modify quantum theory to account for this inconsistency
Law of Perspective ua-cam.com/video/vmVdPgkudC8/v-deo.html
only quantum gravity theory can answer your question
Where can I find your music episode which I know I would enjoy immensely, just like your serious humour.
Thanks Dr. Sabine and keep up the good work.
“bitch, mother, child, lover???”
😂 I like you more and more every time I see another side of your personality - and I learn so much from your excellent videos.
What?
@@mikef4775 Read the title balloon at the very beginning of the video. You have to be quick! :)
@@jimmurphy6095 ohhh I see hahaha
O.M.G. I've already found her extremely sexual. Now what do I do?
@@AlexKarasev She probably just likes the song, relax :)
Be well.
omg my fav musicians also like sabine
Your explaining skills of complex physics phenomena are admirably simple. Even a person like me with school level knowledge starts loving physics. Thanks.
"Your explaining skills of complex physics phenomena are admirably simple. Even a person like me with school level knowledge starts loving physics."
what she is doing is not physics. it is philosophical anti-scientific nonsense
Information bomb. Brain recoils, then recovers. Retaining, recalling, knowing. Instructor successful, student grateful.
Always love these videos. Presentation easy to understand even for me just a regular person.
The potato's mother wept when she heard her daughter was going to marry Marv Albert. "We wanted you to marry a doctor or a lawyer, someone important. Instead, you marry a commentator. boo hoo hoo."
1:29 "but weight.''
Great explanation of something I had not really thought about or understand but now seems clear. I may be mistaken but I don't recall seeing a graviton on the pictures of the standard model of elementary particles. All the other forces had force carriers, like photons for the electromagnetic.
"Great explanation of something I had not really thought about or understand"
it was objectively wrong.
*me, falling, calling for help on the phone* "Help, the floor collapsed I'm falling"
*them* "Nope, you just stopped being forced to fall up, now you're just flowing through the curve of space time."
=P
It's not the fall but the sudden stop!
Thank you. I like your videos because the conent is nicely explained without exaggeration. Also I like that there is no music played in the background. :-)
really love your videos Sabine, thank you for the content :)
Headin' for the heart of Cygnus, headlong into mystery. R.I.P. Neil
... I have mem'ry and awareness
but I have no shape or form,
as a disembodied spirit,
I am dead and yet unborn.
I am currently passing into Olympus...see ya there.
The X-ray is her siren song, my ship cannot resist her long, nearer to my deadly goal, until. . .
Neil's motorcycle books are very good reads.
The force does exist, I can feel it flowing through me
Trust the force, diego
May the force be with you my young padawan
It's pain was forgettable when getting my attention. Incomplete hospital testing maybe missed nutritional overage about dietary iron. I think feeling heavy indicates my organization inability to consistently access my dietary supplements, or else not keeping New Years' traditional greens plus its vegetarian pot-liquor. You know how iron cores can be.
May force be with you
I acknowledge the force when it is charming. Force say to trust myself to rewrite everyone into the stars' line up. How would I like the situation if I were about to be born this year?
Great explanation on why General Relativity doesn't consider gravity a typical force. I disagree that it doesn't matter, as I think that the general public would benefit greatly from having a more accurate understanding of how gravity works. If people simply understood that gravity is the interaction between mass and space-time that gives rise to the downward acceleration of mass in a gravitational field and that it is the Normal force pushing UP on our feet that gives us the sense of weight we normally attribute directly to gravity.
I absolutely LOVE your videos! And your sense of humor!
Thank you so very much!!! Your explanation "clicked" something inside and I had a moment of clarity. I get it and thank you. Du bist der beste!
Die beste. German is great for grammar nazis like me.
May be a dumb question but, if the surface I'm standing on is pushing me up, why do I take extra effort and consume more energy while I go up the stairs?
Glad you are feeling better.
Excellent video Sabine. I think your explanation made so much sense and clarified a lot for me. Very good narration and sorry to hear you were sick last week. Very best,
I liked your clear simple logical explanation of mass weight gravitational force ...looking forward for more such videos.
Fascinating Sabine's always well worth the wait...
You're really awesome.
The weight in the south direction is why I wear a bra everyday !
The nadir direction
the weight in the south direction is why i wear boxers everday !
Honestly, I think this proves gravity is a force acting upon all things rather than the floor trying to push you up.
@@drd1924 Maybe you should have a chat with Albert E.
The level of sarcasm....I love it!
My the force be with you
neon sword, or at least under you.
Maybe "may the curvature be with you."
Man, you rock. If only I had teachers like you in college I might have graduated. 😂
Come for the physics, stay for the dresses.
I come for the jokes, the light hearted delivery and the bubbly personality.
It's nice she doesn't limit her creativity to physics alone.
Shh, you said the quiet part out loud.
0:00 Only a woman can intertwine vanity and lecture in this masterful way.
@@ixglocTV She knows what sells.
I love the Meredith Brooks reference at the beginning :-)
Sabine is so easy to look at. And so smart.
Comedy, a lovely voice, wonderful outfits, and a physics lesson. I love this channel.
SMH man just say what you mean she's pretty and looks good in that dress just say it it's human nature you're allowed we all know she's hot
@Vlasko60 see my point exactly Human Nature is it gross to these modern "intellect's" at least when it comes to a man admiring a woman if it was any other variation you would be applauding
@Vlasko60 LMAO
You are awesome! Love your explanations!
This is the most accurate explanation of gravity that I have watch
compare to other videos misleading information some UA-camrs state that gravity is the moving upward of the ground they did not think acceleration upward is just only a basis of general relativity
because no one knows if we our falling or not!!
That general relativity fabric is always represented in 2d, like a sheet with a dip in it. In 3D, it could be a viscous fluid around a hot object. Near the object there would be less viscosity. Then if you got a ping-pong ball, it would “gravitate” toward the hot object being pushed by the viscosity gradient. That’s what I think gravity is, something pushing us towards the earth.
You are not that far off but the universe is expanding and matter interacts with space thus the space inside of matter is accelerating out from the Earth. Thus since you moment is always in the direct opposite direction of your frame of reference you receive momentum towards the Earth.
@@TheErraticTheory so you are saying the universe (and earth) are expanding towards me when i jump, giving me the illusion I am falling?
@@peters972 Except if you were on the other side of the earth, or elevator, you would be pulled.
Which is why saying the Earth pushes you is silly without saying that it pulls us to the barycenter of gravity (because we are close enough).
@@TheErraticTheory "the space inside of matter is accelerating out from the Earth" - I think the space is accelerating toward the Earth center, because if you are in free fall then you are not accelerating in relationship to local space and everything falls on the Earth.
Sabine... love you... period... happy to hear you're okay...
Physically love her? Or just virtually?
Dear Sabine, I apreciate your humour without laughter. Clearly not american laughing constantly for no reason, jaja. Thanks and love!
What if gravity were an emergent behavior due to a simple principle that mass seeks regions of slower time to conserve energy.
It's just an extension of the conservation of energy. Slower time results in a lower energy state.
woa
I think Kip Thorne has a similar theory that postulates that gravity is not a force but a result of the variability of time as a consequence of nearby mass
nobody proved the influence of time on energy, even if... there is something, some force to push the mass to another mass, you may hide it behind the word "seeks", but it is still a force.
@@marianskodowski8337 ...or "drag". If mass has the option of occupying a faster vs slower time region, it will appear to be "attracted" to the slower time but it's the slower time causing things to happen more slowly so that the mass favors the slower time.
Is serious hotness a force?
Leave the gravity be, love the dress. 🥰
I loved the explanation. I have no idea what it means. I love Sabine
Einstein used to be my hero in physics. Finally, I realized how many bad things he did to physics with his theory of relativity. Cosmology is trapped in field equations and can't get out of it. That's why we are in 'dark ages' in mainstream astrophysics.
Homo Quantum Sapiens Actually he is correct! Einstein won his Nobel prize for his paper on the photoelectric effect.
His paper on special relativity was never peer reviewed before being published in the esteemed physics journal annalyne de physique by Wein & Plank, because it was considered the genius Einstein had no peers!
His own professor Dr Hendric Lorentz always referred to special relativity in mock derision as “Einstein’s theory” because he knew if he had been given the opportunity to review his studen Einstein’s paper, it would never have been published!
Any system of logic that commenced with a false premise always yields a paradoxical outcome.
Example:-
Premise 1 -“All Dogs have 4 legs!” (true).
Premise 2. All 4 legged animals are cats! (False).
Therefore:-
All cats are dogs or all dogs are cats!
Clearly paradoxical!
In Einstein’s special relativity case the paradox was called “the twin paradox”. (Google is your friend).
The false premise in e=mc^2 is that it ignores the negative route solution (any negative integer squared yields a positive result).
So how does a single photon of light travel east (-ve) & West (+ve) AT THE SAME TIME, to satisfy e=mc^2 ?
Clearly paradoxical.
Not entirely Einstein’s fault - he was led astray by the earlier work of Mitchellson & Morley due to experimental design flaw of using 100% silvered mirrors to return the split light beams to the interferometer, in their linear light speed experiment.
But this responder you have attempted to mock in your response is so far ahead of yourself in physics theory - that you haven’t got the first clue! 😜😜👍😂😂🇦🇺
If people can’t get past certain things now, that is not Einstein’s fault. That is ours.
@Homo Quantum Sapiens Einstein was briefed by ETs. They abused him for own agenda.
Einstein is still pretty bad ass in my book.
@Homo Quantum Sapiens at far distances Newton, Einstein and Hubble dont fit at all.
Yeah, but as soon as you say something like "the mass CAUSES the curvature" it seems to bring inevitably the concept of force back.
Not really. You're probably thinking of the rubber sheet analogy. Rubber sheets have mass, so deflecting a real rubber sheet out of shape requires a force. Force is mass times acceleration. Space does not have mass, so its curvature is not the result of a force. Objects travelling through that space follow straight lines in curved space ( _geodesics_ , to use the lingo). Because they have mass, their apparent deflection in 3D space looks like the result of a force. But, then, consider massless particles like photons. They are _also_ deflected by gravity, which would be difficult to explain in terms of a conventional force.
@@ps200306 Ok, but what is a force qualitatively? I think unless you can eliminate the concept of causality or even function or "result" from the theory, you'll find it hard to avoid a force-like concept.
@@mithrandir2006 , oh sure -- that's why we were talking about the _force_ of gravity for hundreds of years before Einstein. A force is a mass times an acceleration, and that's what gravity looks like in 3 dimensions. But the key concept in General Relativity is that _spacetime_ (not space) is curved. An object in curved spacetime cannot travel through time without also travelling through space. That's why it looks like a force.
@@ps200306: I don't know much, I'm just an amateur. But you say the curvature of spacetime is not the result of a force. Ok, but it is the result or is dependent on a mass. How does mass manages to cause this curvature? Anything that causes a sucking or a curvature is a force.
Maybe I'm speculating too much now, but I wonder if the whole physics is the science of forces, and the universe is a set of forces.
Nicely packaged explanation of gravity. Everything about gravity tells us we're falling toward earth, but Einstein's theory turns all that on its head.
Why mass has the property of curving spacetime?
Add to that,that mass is interaction between matter and hex field.
Why should it have such property? What would be the mechanism it would bend space? What would space have to be to be curvable?
Higgs bosons/Gravitons
@Mike Doonsebury
and what exactly is mass without gravity? and no, finding a boson doesnt turn something into a force. thats nonsense.
Nobody has ever been able to answer that question: there's a Nobel Prize or a dozen awaiting to whoever can. It seems a hard nut to crack because I do not find even tentative explanations (hypotheses, draft theories) floating around, as physicists have drifted towards a quantum-based explanation for everything, including gravity that is not however working (nor IMO can work).
We don't even know if it's mass which curves spacetime but that mass is somehow inwardly (and intrisnically) curved spacetime, regular mass is somehow like black holes but less radical. In any case mass is nothing but energy, although not all energy is mass (momentum is not and does not seem to cause spacetime curvature, or does it?)
Sabine I really like your straightforward approach to these subjects like gravity and quantum mechanics videos of yours I have watched thus far. Icwill enjoy watching more of your videos!
THE CLEAR, TRUE, AND UNDENIABLE PROOF THAT ELECTROMAGNETISM/ENERGY MUST BE GRAVITY:
Gravity AND ELECTROMAGNETISM/energy are linked AND BALANCED opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. This NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual IN BALANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Time DILATION proves that electromagnetism/ENERGY IS GRAVITY, AS E=mc2 is DIRECTLY and fundamentally derived from F=ma. (This ALSO explains perpetual motion.) SO, gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Accordingly, the rotation of the Moon matches it's revolution. E=mc2 IS F=ma. Objects fall at the SAME RATE (neglecting air resistance, of course), AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/energy. It ALL CLEARLY makes perfect sense. BALANCE and completeness go hand in hand. THINK !!! ("Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/ENERGY IS GRAVITY.) The stars AND PLANETS are POINTS in the night sky. (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.) This explains the fourth spatial dimension, AS E=mc2 IS F=ma. Great !!!! Consider very carefully what is THE EYE. GREAT !!!
By Frank DiMeglio
How can anyone Disagree? Let's talk in the 4th & 5th dimensions about gravity. Your nice in your delivery.
Thank you for another fascinating video. You explained the theory of gravity so well that I almost understood it.
Catching up on old episodes. Can't go a day with a Sabine video!
Don't you mean "without"...?
No matter how many websites I've visited, until I was here, I understood nothing. Superb.
You look amazing Sabine! :)
So the bed I’m lying in is pushing me up ?
Against my free fall
it holds you up due to electro-magnetic resistance you experience when pushing on it..
Gravity pulls you downward electrgravitically, and the bed (or floor, chair, etc.) pushes you upward electrostatically. Since the two forces balance, you stay put.
Yes!
To me is light reffraction.
When you're laying in bed, you can feel a force under you. It compressed your skin, compresses the pillow under your head, etc.
Are the electromagnetic forces also some kind of curvature in some spacetime? They both honor the inverse square rule, which suggests that they have a similar "cause". (Is there a video discussing this?)
Thanks for this, I've always wondered why calling gravity a force is so ubiquitous since learning about relativity. Now I understand that I was being a pedantic asshole.
Gravity is a force rather than a curved spacetime for multiple reasons.
@@kacemrochd6425 and which reasons are that? can you elaborate your claim further?
@@satrickptar6265 The first reason is that when we calculated the perihelion precession of the planet Mercury as well as the planet Venus using a simplest extension of the Newtonian gravity theory together with the modeling of planets in terms of masses as spherical objects, it turns out that the obtained values for the perihelion precessions of these planets are in perfect accordance with the observation.
As you see we do not use the spacetime curvature effect in our calculations to obtain the theoretical predictions of the perihelion precessions of planets in perfect accordance with observation.
The second reason is that we are trying to unify gravity with other forces such as nuclear forces, electromagnetic forces, etc.
I think for the success of the general relativity that the spacetime and the force approaches of gravity are two sides of one money.
Annoying.
Go easy on yourself... give yourself Time.
[You're welcome.]
@@jacksp1787 Let me tell you that the concept of gravity as a force results from the fact that the observable universe is spinning around a center of mass rather than is expanding at an accelerationg rate. In fact the equation describing the Hubble law and the equation describing the Newtonian velocity are two sides of one money since we derive them from each other using the simplest algebra.
I'm going to say "Einschtein" from now on.
I hope so, Jo!
Love your videos thank you for the upload I have learned so much from you. ❤
You look great, Sabine.
Gravity: force or farce?
I thought about it this way long ago: If you accelerate (anywhere) you always feel a drag effect, but not so with freefalling. Thus gravity itself cannot be a force directly on you, accelerating you.
Thus it is better to model the floor accelerating upwards locally (no gravity)
The feeling you get from standing on the earth is not just at the contact of the feet but your bones pushing up while your inners hang from it. This is the drag affect, but it is pointing upwards!
your too clever for me, no idea what you meant but I still liked your comment.
I was sick last week and now enjoy how I slap this dress on my perfect body.
I'm glad you're well now.
Thanks!
Me too!
Very HEAVY explanation.
How do you explain then, when Wile E. Coyote runs off a cliff, he only falls when he *realizes* there's nothing holding him up?
Must be magic ;)
The laws of cartoon physics are absolute. They hold true throughout the cosmos. Examples from the Wikipedia page on this subject:
• Any body suspended in space will remain suspended in space until made aware of its situation.
• A body passing through solid matter will leave a perforation conforming to its perimeter.
• The time required for an object to fall 20 stories is greater than or equal to the time it takes for whoever knocked it off the ledge to spiral down 20 flights to attempt to capture it unbroken. [Note: the likelihood of success is inversely proportional to the value of the breakable object.]
• All principles of gravity are negated by fear.
• Certain bodies can pass through a solid wall painted to resemble tunnel entrances; others cannot.
• Any violent rearrangement of feline matter is impermanent.
I have also personally observed:
• Talking ducks can withstand direct shotgun blasts with the greatest damage being only that their bills are spun around to face backwards. This reversal condition is temporary.
• Frogs that sing are incapable of performing show-tunes in the presence of more than one person.
Einstein predicted and addressed this wiley problem with his cosmological constant equation.
@@mikearst2940 if you came up with that on the fly, you're a comedy genious. If not, I have to go find that page after my attempt to add to your list.
A character frightened to flee, who doesn't gain traction and runs in place for a time will, when gaining traction, immediately attain at least if not significantly more speed and distance than if they had traction initially.
🐢💨
@@heatshield I would love to be able to take credit for it, but the majority of that list came from the “Cartoon Physics” article on Wikipedia. The last two were mine, though. Two other kind of obscure ones occurred to me later on:
• Human howls of anguish can be delivered noiselessly into small paper bags, remaining fully intact until the bags are opened at a later time, provided, however, that the bags are opened at some distance from the event that produced the anguish.
• No cartoon villain is truly evil; they're just drawn that way.
"mass tells space-time how to curve, space-time tells mass how to move" John Wheeler
you got it by jove
is not it easier that mass of object A tells mass of object B how to move through field each of them creates? Why should mass A tell space how to curve, if space is nothing material, physical, how can it curve? And how can mass B find out space is curved and follow geodesic, how? what is the mechanism of this illogical model?
@@lukabc31 If you object to his explanation, I think you need to do a much better job of explaining your objections, and why it is illogical.
Sorry gravity is a force rather than a curved spacetime for multiple reasons.
Why is the “force” of gravity directly proportional to it’s “speed”?
As an example, I can be strong enough to pull you slowly or fast but your pull towards me is still inevitable. So imagine a black hole that “pulls” on light slow enough that you can actually observe the effect.
0:03 I wonder what her favorite song is hahahahahahaha
😁😁 ua-cam.com/video/zIAku-Qwfl0/v-deo.html
This is so confusing, you call it a force 4 times, then call it gravitational acceleration, then its not like a normal force, then its curvature effecting motion of mass and energy, then its no force at all, then its equivalent to the force in an accelerating elevator. I guess the real answer is "rather technical" :)
It _is_ rather technical as anyone who ever studied General Relativity knows ... but the basics can be understood somewhat straightforwardly. To me the most easily misunderstood point is that it is not _space_ which is curved, but _spacetime_ . That makes all the difference.
@@ps200306 My brain keeps getting stuck on this, if two motionless objects are near each other would they start moving?
@@bazzmond , think about it this way: there is no separate space and time, only spacetime. Think of it like a coordinate frame with the 3 spatial axes and a time axis, all heading off in different directions. Now, it should be obvious that there's no such thing as a motionless object in spacetime. Even if you are not travelling in a spatial direction, you are still travelling in time as "time stops for no man".
Now let's think about a simple 2-dimensional space with East and North axes (or X and Y if you prefer). You can travel east without moving north, or vice versa. But now wrap that flat 2-D space around a sphere. A straight line on a sphere is a great circle. You can't set out eastward on a sphere and travel a great circle without also moving in the northerly coordinate. (Actually, you can, but only on the equator; generally you can't).
Curved spacetime is like that. You are always moving in the time direction. But in curved spacetime you cannot move in the time direction without also moving in a spatial direction. That's why objects in curved spacetime _must_ move unless prevented from doing so by another force (such as the normal force on your behind preventing you from falling through your chair).
Acceleration is not a force, a force causes acceleration. Gravity is not a force -- it does not cause acceleration -- but describing it as a force is a useful approximation that works in most situations.
@@SabineHossenfelder Not helping, guess ill just settle with "rather technical" :)
Maybe it is a force, but can only be approximately calculated by rather technical, 4D non force equations :)
Your videos are incredible. Somehow they are impressively accurate and detailed, while also being approachable to the general public, whilst respecting the greater context of the topic.
Nice content! Though I had to laugh...
Hehe you said you lost 10 pounds? Nooooooo kg???
Isn't the SI system the all mighty system at least for non theoretical physicists? XD
Glad you got better :)
Grams are mass though unlike pounds which are weight , right so next statement wouldn't have worked.
"Honey, does this dress make me look like i have more mass"? hahahaha
Yes it does and the force has deformed your body towards the mass of the Earth. Ha too.
More voluminous as well, if I might add.
@To Release is To Resolve Thanks but it's a mohawk i prefer to call a Mane. Mullets are definitely different. Especially now that it's filled out more.
Pixel data suggests that she exists for us in [only] zwei directions. Demand authenticity!
No, that's just gravity getting you down. Have a little levity before you bottom out.
Wish I had Sabine as a physics teacher in college 30+ years ago. Way better explanations. 👍
A weight has been lifted, thanks
Sabine, I hope you are once again feeling heavier.
Parts of my body seem to show 'anti gravity' effects when I watch this video!
I must consult my General Relativity handbook and postulate a reasoning for this conundrum.
relax
"I was sick last week and I lost like 10 pounds in 3 days". Translation: "I spent 3 days on the toilet." I'm surprised she said that out loud.
@FI Losing 10 pounds in 3 days is 3.3 pounds per day. Only extreme dehydration or diarrhea will get results like that.
@@charliehorse8686 That is inaccurate. 3.3 pound per day will only yield 9.9 total pounds lost. If she had lost an equal amount of pounds per day then a day would have to last infinitely long
She DIDN'T say it. And she said "like" 10 lbs., so the 9.99 lb. nitpicker can go down to the beach and 'pound' sand.
Aside from the great video, that outfit is amazing.
Something more than gravity is affecting me.
In the Cavedish experiment what is attracting smaller ball towards larger ball? There is no acceleration in this experiment which determined the gravitational constant G. Incidentally G is used in Einstein's field equation. Why it is used if there is no gravity?
Extremely smart and sweet at the same time. A charming person, I am a fan
I don't know if it's a force or not, but I do feel an attraction. 😛
Mathematics Professionals (with 7,488 likes) has now given the following writing the thumbs up on their page:
The page Nexus of Physics has now given the following two writings the thumbs up on their page. ALSO consider this: E=mc2 is DIRECTLY and fundamentally derived from F=ma, AS E=mc2 IS F=ma; AS time DILATION proves that electromagnetism/ENERGY IS GRAVITY.
THE UNIVERSAL AND MATHEMATICAL PROOF THAT ELECTROMAGNETISM/ENERGY IS GRAVITY:
Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. "Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/ENERGY IS GRAVITY. E=mc2 is DIRECTLY and fundamentally derived from F=ma. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. SO, gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE consistent with/as what is BALANCED electromagnetic/gravitational force/ENERGY; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. "Mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent with/as what is BALANCED electromagnetic/gravitational force/ENERGY, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity AND ELECTROMAGNETISM/ENERGY are linked AND BALANCED opposites, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. THE SUN AND THE EARTH are described and represented by BOTH F=ma AND E=mc2. F=ma AND E=mc2 PROVE that ELECTROMAGNETISM/ENERGY IS GRAVITY, AS ALL of SPACE is NECESSARILY electromagnetic/gravitational (IN BALANCE). Objects fall at the same rate (neglecting air resistance, of course), AS the SPEED OF LIGHT is RELATIVELY CONSTANT AS WELL. ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/ENERGY. In fact, the rotation of THE MOON MATCHES it's revolution; AS gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. So, THE PLANETS (INCLUDING WHAT IS THE EARTH) are not "falling" in what is "curved SPACE" in RELATION to what is THE SUN. This is nonsense. E=mc2 is DIRECTLY AND FUNDAMENTALLY DERIVED FROM F=ma. This truly explains PERPETUAL MOTION. Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black. The stars AND PLANETS are POINTS in the night sky. A PHOTON may be placed the center of THE SUN (as A POINT, of course), as the reduction of SPACE is offset by (or BALANCED with) the SPEED OF LIGHT; AS ELECTROMAGNETISM/ENERGY IS GRAVITY.
By Frank DiMeglio
EINSTEIN NEVER UNDERSTOOD PHILOSOPHY, MATHEMATICS, AND PHYSICS, AS HE HAS BEEN TOTALLY OUTSMARTED BY SIR FRANK MARTIN DIMEGLIO:
The balance of being AND EXPERIENCE is ESSENTIAL. BALANCE AND completeness go hand in hand.
THE SELF represents, FORMS, and experiences a COMPREHENSIVE approximation of experience in general by combining conscious and unconscious experience. MOREOVER, the ability of THOUGHT to DESCRIBE OR RECONFIGURE sensory experience is ULTIMATELY dependent upon the extent to which THOUGHT IS SIMILAR TO sensory experience. THOUGHTS ARE INVISIBLE.
Dream experience is/involves true/real QUANTUM GRAVITY, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. MOST IMPORTANTLY, in dreams, BODILY/VISUAL EXPERIENCE is invisible AND VISIBLE IN BALANCE. IMPORTANTLY, dream experience is possible/potential AND actual IN BALANCE. THE EYE is ALSO the body. Dreams improve upon memory AND UNDERSTANDING. Indeed, there is no outsmarting the GENIUS of dreams.
OVERLAY what is THE EYE in BALANCED RELATION to/with what is THE EARTH. NOW, get a good LOOK at what is the translucent, SEMI-SPHERICAL, QUANTUM GRAVITATIONAL, AND BLUE sky. Excellent. The DOME of a person's EYE is ALSO VISIBLE. THE EARTH IS also BLUE (as water).
F=ma AND E=mc2 PROVE that, why, and how ELECTROMAGNETISM/ENERGY IS GRAVITY. This NECESSARILY represents, INVOLVES, and describes what is possible/potential AND actual IN BALANCE. SO, it is NECESSARILY a matter of precisely how these equations are understood in a BALANCED, EXTENSIVE, AND INTEGRATED fashion in RELATION to/with WHAT IS THOUGHT. The INTEGRATED EXTENSIVENESS of THOUGHT (AND description) is improved in the truly superior mind. E=mc2 is DIRECTLY and fundamentally derived from F=ma.
Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.
The stars AND PLANETS are POINTS in the night sky. A PHOTON may be placed at the center of THE SUN (as A POINT, of course), as the reduction of SPACE is offset by (or BALANCED with) the SPEED OF LIGHT; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Get a good LOOK at what is THE EYE. POINTS are points. Gravity IS ELECTROMAGNETISM/ENERGY. ELECTROMAGNETISM/ENERGY IS GRAVITY. GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. "Mass"/ENERGY involves BALANCED inertia/INERTIAL RESISTANCE consistent with/as what is BALANCED electromagnetic/gravitational force/ENERGY, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. "Mass"/ENERGY IS GRAVITY. ELECTROMAGNETISM/ENERGY IS GRAVITY. Energy has/involves GRAVITY, AND ENERGY has/involves inertia/INERTIAL RESISTANCE. F=ma AND E=mc2 PROVE that ELECTROMAGNETISM/ENERGY IS GRAVITY, AS ALL of SPACE is NECESSARILY electromagnetic/gravitational IN BALANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT.
The stars AND PLANETS are POINTS in the night sky. OPEN your EYES. NOW, LOOK at what is the FLAT, SETTING, AND ORANGE SUN (with the SPACE around it THEN going invisible AND VISIBLE IN BALANCE). This ORANGE SUN manifests or forms at what is EYE LEVEL/BODY HEIGHT as well. This ORANGE SUN is manifest ON BALANCE as what is NECESSARILY the BODILY/VISUAL EXPERIENCE of THE EARTH/LAVA. The viscosity of LAVA IS BETWEEN what is manifest as WATER AND THE EARTH/GROUND. ALL of SPACE is NECESSARILY electromagnetic/gravitational IN BALANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. F=ma AND E=mc2 do provide absolute, BALANCED, THEORETICAL, and CLEAR proof that ELECTROMAGNETISM/ENERGY IS GRAVITY.
Gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE, AS ELECTROMAGNETISM/ENERGY IS GRAVITY. THEREFORE, the rotation of THE MOON MATCHES it's revolution. MOREOVER, a given PLANET (INCLUDING WHAT IS THE EARTH) sweeps out equal areas in equal times; AND this is THEN consistent with/as what is F=ma, E=mc2, AND what is PERPETUAL MOTION; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. It ALL makes perfect sense. BALANCE AND completeness go hand in hand.
THE PLANETS (INCLUDING WHAT IS THE EARTH) are NOT "falling" in what is "curved SPACE". In fact, this is nonsense. It is PROVEN.
By Frank DiMeglio
@@frankdimeglio8216 ¿¡Qué!?
In the pictures where a ball is sitting on an elastic cloth with lines on it, the lines horizontally around the ball are bend inwards (see picture at 2:15), but the lines vertically around the ball are bent outwards. Now I understand that im real space, we have a 3d "cloth"/texture. But how would it look there?
I really like that dress snap, do it again!
Omg now that meredith Brooks song is stuck in my head.
Thank you.
Very well explained.
40 down votes - must be some flat Earther's here.... Great video that all FEers should see.
How do they explain Trip Around the World holiday tours, basically circumnavigating Earth? Their high school certificates should be revoked...
@@santyclause8034 you're assuming they finished... School
The earth really is flat and I have proof!
@@harriehausenman8623 NO, you don't.
Don't forget Electric Universe adepts! I can hear them sticking fingers in their ears and chanting: nanananananananana..
The Queen of physics!!!
❤Nice addition to her new video, about that gravity is not a force.
The fact that it helps hold an entire universe together, pretty much makes it a force to me. You can't think of gravity with simply jumping up and down. You have to consider it as a collective force. Like ants in a way of thinking.
First to comment! GOt pulled right in!