Why Gravity is NOT a Force
17:34
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:
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 YouTube channel: or his books:
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Gravity Is Not a Force
5:57
A follow-up to my video “How Gravity Makes Things Fall.” Please watch them together. (The content of both videos is standard science, not my own research, theory, or thing I pulled out of my behind.)
#1 question asked by viewers: If the surface is accelerating upward in all directions around the globe, doesn't that mean the Earth is expanding?
Answer: No. Acceleration does not necessarily mean speeding up like how a car can speed up when you step on the gas. Consider, by analogy, a rotating wheel. The points along its edge are constantly accelerating toward the center (centripetal acceleration, discussed in the video at 4:21) — but the wheel is not shrinking or getting crushed. Acceleration is defined as any change in velocity (velocity includes direction). In the case of a massive object like the Earth, the acceleration is caused not by rotation but by the curvature of spacetime: The direction through four-dimensional spacetime of anything on the surface, or supported by the surface, is constantly changing, and that's the acceleration. Meanwhile the direction through spacetime of a free-falling object does not change — acceleration is zero — and the difference is what makes a falling object appear to accelerate downward. This will be much clearer if you watch How Gravity Makes Things Fall (link above): Notice how, where there's gravity, spacetime curves upward (away from Earth's center), while a free-falling object moves in a straight line through that curved spacetime. (Unstretching the device, which causes the straight lines to become curved and vice versa, corresponds to changing from an inertial reference frame to the accelerated frame that we normally experience, where things on the ground appear to be at rest and inertially traveling objects appear to fall.)
Some physics cranks DO believe that gravity is explained intuitively by a constant expansion of the Earth. But the pseudoscience of expansion gravity cannot explain elliptical orbits, hyperbolic trajectories, and the relation between surface gravity, radius, and density. It’s also wildly in conflict with experiments and the accepted calculations of celestial bodies’ surface gravities. Just think of gravity as a kind of acceleration-in-place that appears as the more familiar (upward) linear acceleration when you are free to move inertially.
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Our Ignorance About Gravity
5:38
Thanks to the Heising Simons Foundation ( for their support of this video, and of short range gravity research.
This video is about how little we know about the behavior of gravity at short length and distance scales, what the constraints are on the inverse square law/Newton's law of universal gravitation, at the human and microscopic and atomic scales. Only on solar system scales or larger do we have good constraints on Newton's law of gravitation.
REFERENCES
Review of short-range gravity experiments in the LHC era
Zeptonewton force sensing with nanospheres in an optical lattice
Large extra dimensions
Search for Screened Interactions Associated with Dark Energy Below the 100 μm Length Scale
Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale
Photon Mass Experiment
Torsion balance experiments: A low-energy frontier of particle physics
E.G. Adelberger, J.H. Gundlach, B.R. Heckel, S. Hoedl, S. Schlamminger
doi:10.1016/j.ppnp.2008.08.002
TESTS OF THE GRAVITATIONAL INVERSE-SQUARE LAW
E.G. Adelberger, B.R. Heckel, and A.E. Nelson
Annu. Rev. Nucl. Part. Sci. 2003. 53:77–121 doi: 10.1146/annurev.nucl.53.041002.110503
Physical Review A, Vol 33, No 1: Improved result for the accuracy of Coulomb's law: A review of the Williams, Faller, and Hill experiment.
Lewis P. Fulcher.
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Is Gravity An Illusion?
12:33
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Most of us take gravity as an assumed part of our living realities, but why? Basic physics introduces us to the concept of gravity from a Newtonian sense, but when you start factoring Einstein into an understanding of gravity, things get… weird. For example, gravity may simply not exist. Why? Watch this week’s episode of PBS Space Time and find out why gravity may be an illusion!
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The REAL source of Gravity might SURPRISE you...
7:44
Einstein's general relativity says gravity is spacetime curvature, but what does that mean? Let's take a look at how gravitational time dilation results in an effect that looks a lot like gravity. The flow of time brings mass together.
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What is Gravity? The Illusion of Force by a Curved Dimension
8:41
Why does it seem everything attracts everything to themselves? If gravity technically isn't a real force, then why can it perform work? Because although imperceptible to us, the 4th dimension is curved.
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Erik Verlinde: Gravity Doesnt Exist | Big Think
8:26
Gravity Doesn't Exist??
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ERIK VERLINDE:
Erik Verlinde is a theoretical physicist and string theorist and the Institute of Theoretical Physics at the University of Amsterdam. The Verlinde formula, which relates to conformal field theory and topological field theory, is named after him. In a paper called On the Origin of Gravity and the Laws of Newton, published in January, 2010, Verlinde introduced a new approach to the idea of gravity, positing that it is not a fundamental force but an emergent phenomenon.
Verlinde's idea that gravity doesn't exist was featured in Big Think's Month of Thinking Dangerously.
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TRANSCRIPT:
Erik Verlinde: Gravity, of course, is something that have, well, many people have already thought about. It’s something that we see every day and it’s not like it’s not existent in our ordinary life. But what I mean by that it’s an illusion is that one would eventually like to know where it comes from, an explanation. Up to now we have, well, descriptions, I mean, Newton, of course, is the one famous for first writing down a theory of gravity and he described why apples fall and why the moon goes around the earth using the same basic equation for gravity, but he described it. He had to assume that gravity was there and then had to write down a law that described that when two masses are a certain distance, how they attract each other.
But he was also not very happy with the fact that we should just, well, assume that these things, these objects, attract each other and without even anything in between. So if there are two masses and empty space, there’s no, nothing that really happens between them, but still, they’re attracting each other. And he thought that was kind of mysterious and that it was something he would have liked to explain in a better way.
So later came Einstein and Einstein, with his theory of relativity, eventually realized that also gravity has to be described in a different way. And it took him quite some years, but eventually he wrote down a theory where he thought about space and time together and then his explanation of what gravity would be is that there’s masses which curve space, and time. And then motion of planets and of the earth around the moon, or the moon around the earth is then described by thinking about moving in this curved space-time and how then objects are, well, making their orbits. And the reason they go around then in circles is that space and time itself is curved, in the sense that things don’t move in straight lines anymore, they go around. So that was his explanation, but he had to write an equation for it, which again, assumed that gravity was there because he basically wrote down matter curves space-time.
So in a certain way that’s still a description or what, I should say is, well, one would like to understand again why this description sort of, well, how you can understand it from a more basic point of view. So what I’ve done in my paper is try to start from a, well, from a point of view where you don't assume gravity to be there, they would like to explain it by seeing how you can derive it from a more microscopic set of equations where gravity itself is not assumed, but then just follows from a certain logical reasoning.
Question: How should we think about the forces that exist to create the illusion of gravity?
Erik Verlinde: If you think about particles, very tiny particles, and it turns out that things like positions and velocities are not very precisely defined, you have to take into account the fact that there’s an uncertainty in when we look at something, we may influence the measurement, but I mean, also just, there’s a fundamental limit on how precise you can understand the position or the velocity of a particle. They cannot be all, not both described infinitely precise.
So taking gravity into account then gives us a bit of a problem because then we have to talk about space-time and then these quantum certainties gives us another way of looking at space-time at the short distances. So this led to problems... and string theory is another way of also looking at gravity and quantum mechanics, which I’ve been working on quite a bit. So people have studied the problem of quantum mechanics in gravity from various perspectives—from string theory, but also was thinking, for instance, about black holes, what happens with black holes.
Read more on Bigthink.com
The story of Gravity and Why Gravity is NOT a Force!
22:13
What is Gravity? In this video, we start our quest with Aristotle; pick some ideas along the way from Galileo and Newton; and finally arrive at Einstein's theory of Space-time.
After watching, you will be able to understand the following:
0:00 Aristotle's idea of Gravity
1:45 Galileo's idea of Acceleration
6:31 Newton's idea of Gravity
9:28 Limitations of Newton's Gravity
12:26 Einstein's Space-time Gravity
18:42 Limitations of Einstein's Space-time
Einstein Might Have Been Wrong About Gravity... Here’s Why
4:28
The universe is expanding, and fast. And this new theory could explain why.
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The universe is expanding, and that expansion is speeding up... which is the opposite of what we expected.
There are lots of different ideas about what could be causing the inexplicable acceleration of this expansion, and one commonly suspected culprit is something called dark energy. Though historically, we aren’t entirely sure what dark energy is either. But now, we might finally have an explanation.
Professor Claudia de Rham at Imperial College London suggests something pretty radical: that gravity has mass.
In Albert Einstein's theory of general relativity, gravitons should be massless, but in de Rham’s proposal, the graviton has mass. And if gravitons have mass, then gravity is expected to have a weaker influence on very large distance scales, explaining why the expansion of the universe hasn’t been reined in.
Find out more about De Rham’s radical theory that could hold the key to why the universe is rapidly expanding and explain the nature of dark energy in this Elements.
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Did Scientists Finally Solve the Impossible Physics Riddle?
Massive gravity changes Einstein’s theory of general relativity, and it implies some truly wild stuff, like that gravity waves with mass would consequently have momentum.
Has physicist's gravity theory solved 'impossible' dark energy riddle?
The work marks a breakthrough in a century-long quest to build a working theory of massive gravity. Despite successive efforts, previous versions of the theory had the unfortunate feature of predicting the instantaneous decay of every particle in the universe – an intractable issue that mathematicians refer to as a “ghost”.
Turning gravity upside down
“The beautiful thing about Einstein’s theory of general relativity is that the red flags are built in – we know that, at some point, it will stop working,” says De Rham. It tells us exactly when it’s breaking down, and when new physics is needed. That doesn’t happen very often in science.
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The Mysterious Force of Gravity Explained by Neil deGrasse Tyson
10:02
Of the 4 fundamental forces of nature, gravity is the most intuitive one. We experience gravity every second of our lives so it makes sense that our brains are evolutionarily equipped to intuitively grasp the effects of gravity. At least here on Earth.
Neil deGrasse Tyson explains what gravity is and how this mysterious force works and effects the fabric of space time. And why it effects the very nature of the universe itself. And if the question Why is even a good scientific question.
Neil deGrasse Tyson mentions that scientifically speaking, we pretty much understand how gravity works and that is good enough to make scientific progress and questions like why does gravity work belong to set of philosophical questions that are not necessarily useful.
So what is gravity exactly?
Gravity is a natural phenomenon by which all things with mass or energy including planets, stars, galaxies, and even light gravitate toward one another.
Modern work on gravitational theory began with the work of Galileo Galilei in the late 16th and early 17th centuries. In his famous experiment dropping balls from the Tower of Pisa, and later with careful measurements of balls rolling down inclines, Galileo showed that gravitational acceleration is the same for all objects. This contradicted Aristotle's belief that heavier objects have a higher gravitational acceleration. Galileo postulated air resistance as the reason that objects with low density and a high surface area fall more slowly in an atmosphere. Galileo's work set the stage for the formulation of Newton's theory of gravity.
In 1687, Sir Isaac Newton published Principia, which hypothesizes the inverse-square law of universal gravitation. Newton's theory enjoyed its greatest success when it was used to predict the existence of Neptune based on motions of Uranus that could not be accounted for by the actions of the other planets.
However a discrepancy in Mercury's orbit pointed out flaws in Newton's theory.
The issue was resolved in 1915 by Albert Einstein's new theory of general relativity, which accounted for the small discrepancy in Mercury's orbit.
In general relativity, gravity is described by the geometry of spacetime and the laws of physics. According to general relativity, gravity is not a force but instead is caused by the curvature of space–time caused by matter.
Neil deGrasse Tyson give everyday examples to better understand how gravity works meaning how the very fabric of spacetime is curved by matter. In a nutshell: Space tells matter how to move and matter tells space how to curve.
#gravity #neiltyson #science
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Why Do Things REALLY Fall?
5:56
In classical physics, gravity is a force that pulls objects toward the center of the Earth. In general relativity, gravity is the result of curved spacetime and geodesics, but what exactly does that mean?
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Defining Gravity: Crash Course Kids #4.1
3:12
So, if gravity pulls everything down, then why don't things on the bottom of the Earth get pulled down into space? In this episode of Crash Course Kids, Sabrina talks about gravity and explains that when we talk about gravity pulling things down, what we really mean is gravity is pulling things TOWARD the Earth. Really, it's all about attraction.
This first series is based on 5th grade science. We're super excited and hope you enjoy Crash Course Kids!
///Standards Used in This Video///
5-PS2-1. Support an argument that the gravitational force exerted by Earth on objects is directed down. [Clarification Statement: “Down” is a local description of the direction that points toward the center of the spherical Earth.] [Assessment Boundary: Assessment does not include mathematical representation of gravitational force.]
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Quantum Gravity: How quantum mechanics ruins Einsteins general relativity
14:01
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Einstein Field equations explained intuitively and visually: Isaac Newton changed our paradigm by connecting earthly gravity, with the movement of heavenly bodies. He formulated an equation that is still used today - the law of universal gravitation. But it had problems - action at a distance and the the rate of precession of Mercury
250 years later, Einstein, with the General theory of relativity, solved the riddle of Mercury’s precession, and showed that gravity was due to a bending of space-time itself. Today, we find holes in Einstein’s theory, such as its inability to explain the singularity inside black holes, and the big bang.
Newton’s and Einstein’s equation are similar . They both have Newton’s gravitational constant. In Newton’s equation, a force is on the left side, created by mass on the right side. In Einstein’s equation, the analog of force, the curvature of space-time is on the left side. And mass-energy-momentum tensor is on the right side.
A tensor can be an array of vectors, scalars, or other tensors represented by an N x N matrix.
Although Einstein's equation looks simple, it is actually 10 equations, and is very complicated. The equations describe curvature of space-time by treating it as being flat at infinitesimally small distances. So general relativity behaves like special relativity at these small distances. But overall curvature is taken into account. The Ricci curvature tensor tells us how space-time is deviating from flat.
The second term on the left side is composed of R, the scalar curvature, which is how much the space is changed at a point, such that you know how to correctly measure distances. Little g is the metric tensor. It tells you the geometry and structure of spacetime. Together this term defines how distances are calculated, given a curvature at a point.
Sometimes a third term is added, lambda. the cosmological constant. This describes the intrinsic energy density of empty space. It is the mathematical expression for dark energy – the accelerating expansion of the universe.
The right side has a constant which is the Einstein gravitational constant. It is a conversion factor to make sure we get the proper units.
On the right side - T is the stress energy momentum tensor, which tells us the density of energy and momentum at each point in space time. It is a source of the curvature.
The way these equations are formulated is by treating space-time in 4 dimensions. Three spatial dimensions, and one dimension of time. This is incorporated in the mu and nu subscripts.
When mu and nu are zero and zero, the left side describes the speeding up or slowing down of time at a point in space. The right side describes the energy at that point.
If the mu and nu are zero and one, the left represents the stretching of time within one spatial dimension. The right side is the momentum.
If mu and nu are one and one, the left side describs the stretching of space in one of the dimensions. The right side is the pressure at a point in space.
General relativity is generally true - it predicts bending of light around massive objects, which has been observed, and it predicts that time will run more slowly on the surface of earth than a mountaintop, which has been confirmed.
But it is incomplete. The problem is that it does not fit with an even more accurate theory - quantum mechanics.
For example, quantum theory says that the electron in an atom is in a superposed state, meaning it is in multiple positions from the nucleus at the SAME time. We only know the probability of finding it at particular radius, if we measure it. Since the electron has mass, general relativity says it must curve space-time. But if it is in multiple locations at the same time, then where is the curvature? Is it also at multiple locations at the same time? We don’t know. There is nothing in general relativity akin to superposition.
#quantumgravity
#einsteinfieldequations
#generalrelativity
GR also predicts matter and energy being compressed to an infinitely small point with infinite curvature in a black hole. But since the equations treat space-time mathematically as being flat at infinitesimally small distances, a problem occurs when space is not flat at infinitesimally small distances, at a singularity.
Mathematical infinities are usually wrong, so there is probably something else going on. There are two theories that are promising, Loop Quantum Gravity and String theory - the subject of my next video.
WTF Is Gravity? Scientists Don’t Really Know Either
12:43
Gravity is a simple concept, but the “why” and the “how” are magnificently complicated. How much of gravity do we actually understand?
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Newton’s Laws of Motion
“Newton worked in many areas of mathematics and physics. He developed the theories of gravitation in 1666, when he was only 23 years old. Some twenty years later, in 1686, he presented his three laws of motion in the ‘Principia Mathematica Philosophiae Naturalis.’”
Isaac Newton: The Man Who Discovered Gravity
“Some argue that these ideas, while not scientific in the sense that we understand them now, helped him think radical thoughts that shaped his most important work, including his theories of gravity.”
What is Gravity?
“Anything that has mass also has gravity. Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is.”
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5 Places on Earth Where Gravity Doesnt Seems to Work
5:47
CRAFTS & HACKS ►
For certain you all know the story of Isaac Newton: he was sitting under a tree, and an apple fell on his head, and after that he immediately discovered the law of universal gravitation. But there’re places on the Earth where this law actually doesn’t work. In today's video, we’re gonna tell you about the 5 mysterious places on our planet, where at first sight there’s absolutely no gravity. Ready to learn something new?
What if there was No Gravity on Earth? + more videos | #aumsum #kids #science #education #children
4:41
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From purely physics point of view, there would be no earth left, as no gravity means no mass. But, leaving this point aside, let's see what else will happen.
Oceans, rivers and lakes will float away. Entire atmosphere will vanish, only vacuum will be left. Everything on the surface of the earth including humans, cars, rocks, etc., will become weightless and float away into space. Things which are rooted into earth like trees, bridges and buildings will remain, but not for long.
On a funnier note, anybody will be able to lift heavy weights, football will become a one kick game and there will be no need of stairs or elevators. Finally, earth will also start breaking into chunks as it is held together by gravity.
Does Time Cause Gravity?
11:51
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We know that gravity must cause clocks to run slow on the basis of logical consistency. And we know that gravity DOES cause clocks to run slow based on many brilliant experiments. But I never explained WHY or HOW gravity causes the flow of time to slow down. And I’m not going to explain it now - because in a sense it’s not true. Gravity does NOT warp the flow of time. It’s the other way around - the warping of time causes gravity.
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How Does Gravity Work?
5:32
How Does Gravity Work?
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Ever since the apple fell on Isaac Newton's head that fateful day, scientists have been working hard to understand the mysterious force that is gravity. Lucky for us, they've learned a great deal, and the knowledge is out there for all to see! But as with many such concepts, while most people have a grasp on it, rather few understand completely how it works. Let's remedy that. If you want more Science videos, check out our “Biggest Science Questions” playlist on the channel. Now get ready, it’s time to ask the question: How does Gravity Work?
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Why is gravity different?
5:08
We probably think we know gravity pretty well. After all, we have more conscious experience with this fundamental force than with any of the others (electromagnetism and the weak and strong nuclear forces). But even though physicists have been studying gravity for hundreds of years, it remains a source of mystery.
In our video Why Is Gravity Different? We explore why this force is so perplexing and why it remains difficult to understand how Einstein’s general theory of relativity (which covers gravity) fits together with quantum mechanics.
Gravity is extraordinarily weak and nearly impossible to study directly at the quantum level. We cannot scrutinize it using particle accelerators like we can with the other forces, so we need other ways to get at quantum gravity.
Enter black holes. In a paper in the early 1970s the late physicist Jacob Bekenstein investigated the question of what happens to entropy—a measure of disorder, or randomness, in a system—when matter succumbs to a black hole’s massive gravitational pull and falls through its event horizon.
Bekenstein noted that the matter’s entropy seems to disappear inside the black hole. Yet this would violate the second law of thermodynamics, which states two things: information cannot be destroyed, and entropy can only increase. Thus the entropy of the black hole must compensate for the loss. Bekenstein argued that this black hole entropy must not be proportional to the black hole’s volume, but to the area of its event horizon.
If we are describing the contents of black holes in terms of area instead of volume, we should think about laws of physics in terms of area as well. This would mean a theory of everything (gravity included) should be able to play out in fewer than three spacetime dimensions.
Now let’s imagine the information that describes the state of the entire universe—all stored on a single hard drive. And then throw that hard drive into a black hole. The stored information cannot be lost, so it must be contained in the surface area of the black hole (albeit scrambled).
This scenario leads to a dramatically new way of thinking in which the universe could effectively be a hologram, a seemingly 3-D object that is actually just a projection from a 2-D surface. Our ostensibly three-dimensional experience of the world would then be an illusion, convincingly generated by a fundamentally lower-dimensional reality.
Maybe we’re all just paper-thin cutouts drifting in gravity’s cosmic breeze.
What If We Lost Gravity for 5 Seconds?
5:52
Unless you're an astronaut, you probably don't spend a lot of time thinking about gravity. We all take gravity for granted, and it would be hard not to!
Aside from a tiny sliver of the world's population, most humans don't know a life without gravity. From the Universe to our Solar System, to each planet, all the way down to our own bodies, gravity holds everything together. But since we tend to see gravity as a given, it's hard for us to imagine just how helpless we'd be without it... until it's actually gone.
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Why Doesnt the Moon Fall to Earth? Exploring Orbits and Gravity
5:27
Using a bucket with stretchy fabric stretched over it, allow visitors to experiment with marbles and weights to discover some basics about gravity and orbits. View more details about this activity here:
Does Gravity Really Affect The Passage Of Time? | Gravity And Me | Spark
8:31
Physics professor Jim Al-Khalili investigates the amazing science of gravity. A fundamental force of nature, gravity shapes our entire universe, sculpting galaxies and warping space and time. But gravity's strange powers, discovered by Albert Einstein, also affect
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How Does Gravity Warp the Flow of Time?
12:44
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There’s a deep connection between gravity and time - gravitational fields seem to slow the pace of time in what we call gravitational time dilation. And today we’ll explore the origin of this effect. And ultimately, we’ll use what we learn to understand how curvature in time - this gradient of time dilation - can be thought of as the true source of the force of gravity.
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15 Places on Earth Where Gravity Doesnt Seem to Work
24:05
If it weren’t for the gravitational force on earth, we would float instead of walk. It’s what binds us and mostly everything around us, to the earth. But in some places on earth, a strange phenomenon is at work, and the gravitational force becomes zero. From the waterfall that’s flow defies logic to the mystery anomaly in a forest outside of Santa Cruz, California, here are 15 Places on Earth Where Gravity Doesn’t Seem to Work!
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Nikola Teslas Dynamic Theory of Gravity
5:52
Tesla claimed to have developed his own physical principle regarding matter and energy that he started working on in 1892 and in 1937, at age 81, claimed in a letter to have completed a dynamic theory of gravity that [would] put an end to idle speculations and false conceptions, as that of curved space
This theory is based on the work and ideas of Tesla although the main manuscript is lost many of his ideas and concepts on a gravitational theory can still be found. This video gives us an objective understanding of the electromagnetic force explaining gravity as a secondary force to the EM force (Tesla dynamic theory of gravity). In this theory electrical potential, gravitational potential and human potential are all linked by one universal process! Also curved space is never empty because electric charge is an innate part of matter, there is always electromagnetic fields.
Nikola Tesla:
There is nothing endowed with life—from man, who is enslaving the elements, to the nimblest creature—in all this world that does not sway in its turn.
Whenever action is born from force, no matter how small it is the cosmic balance is upset and the universal motion results.
Gravity Visualized
9:58
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Dan Burns explains his space-time warping demo at a PTSOS workshop at Los Gatos High School, on March 10, 2012. Thanks to Shannon Range from the Gravity Probe B program for creating the original demonstration which he shared with Dan in 2004.
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Relativity & Gravity - The Complete History
10:35
Einstein (and his friends) came to some pretty crazy conclusions about gravity. By the end of this video, you'll have no choice but to come to the same conclusions. We'll start with a little background though: From Galileo in 1632 all the way to Einstein in 1905 and 1915.
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The Mysterious and Powerful Force of Gravity
3:55
Experts explain how gravity has the ability to bend light and even time. This is why the immense gravitational pull of a black hole distorts everything around it. |
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15 Places on Earth Where Gravity Doesnt Seem to Work
24:02
Of all the bonkers stuff on our planet, there are some things that remain constant. Chocolate always tastes good; water is always wet, and gravity always works. But what if we were to tell you that the last of those three isn’t quite as guaranteed as you might have thought? These are places onEarth where Gravity doesn’t seem to work!
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Gravity & Free Fall | Forces & Motion | Physics | FuseSchool
5:23
Gravity & Free Fall | Forces & Motion | Physics | FuseSchool
In this video you will learn about gravity, gravitational force, the law of gravity and the affects without gravity.
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Galileos Famous Gravity Experiment | Brian Cox | BBC Two
3:35
You probably know that two objects dropped in a vacuum fall at the same rate, no matter the mass of each item. If you’ve never seen a demonstration of this, then you really should, because it’s incredible to watch.
Here is perhaps the perfect example, brought to us by physicist Brian Cox. He checked out NASA’s Space Simulation Chamber located at the Space Power Facility in Ohio. With a volume of 22,653 cubic meters, it’s the largest vacuum chamber in the world.
In this hypnotizing clip from the BBC, Cox drops a bowling ball and a feather together, first in normal conditions, and then after virtually all the air has been sucked out of the chamber. We know what happens, but that doesn’t stop it from being awesome, especially with the team’s ecstatic faces.
full-length experiment:
Credit: iflscience, BBC Two
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Experimental Proof That Gravity Is Not A Force
2:41
The third video in my gravity/general relativity series, after 2014’s How Gravity Makes Things Fall” and more recently, “Gravity Is Not a Force (And The Acceleration Is Upwards)” .
To be clear, the surface of the Earth is not accelerating in a linear manner, like a car speeding up. However, post-Einstein physics describes gravity as spacetime curvature, and in that context, the surface is indeed accelerating upward; while free-falling or inertial objects take straight-line paths through spacetime (also known as a geodesics). I invite you to watch all three of the videos in this series!
Note to those who are reproducing the experiments: Not all accelerometer apps use the same sign conventions. Some use the convention of –9.8 meters per second squared in the z direction (I noticed this in Blender, too). The app used in this video is Google Science Journal. The important things to notice are that (1) freefall registers zero g, or close to it, and therefore zero force, and (2) lifting your phone increases the absolute value of the acceleration above 1g, showing that linear upward acceleration is in the same direction as gravitational acceleration. Flipping your phone over will provide positive values of acceleration at rest — although one other axis will be reversed. This is why it’s important to specify your coordinate axes carefully.
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Is Gravity a Force?
4:19
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.
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HINDI Why Gravity is NOT a Force| General theory of Relativity in Hindi| What is Gravity Explained
3:13
NEWTON was WRONG when he said gravity is a force. Know what exactly is Gravity. Learn General theory of relativity in Hindi. Newton said Gravity acts instantaneously between two objects whatever may the distance between them . But later Albert Einstein told us that gravity is in fact a curvature of spacetime fabric and travels at the speed the light.
Learn about theory given by Albert Einstein known as General theory of Relativity which tells us that gravity is not a force but gravity is just a bend or curvature in spacetime fabric.
Watch this video till end to know everything about this curvature of spacetime and true meaning of gravity .
#GeneralRelativity #gravity #spacetime #curvature
-------Contents of this video------------
0:00 Newton couldn't explain Gravity
0:42 Einstein on Speed of Light
1:02 What if our Sun suddenly disappeared?
2:09 Einstein's idea of 4-D spacetime and Gravity
2:18 What is gravity?
2:30 Why planets revolve around Sun?
2:43 What is a Gravitational Wave?
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Gravity Is Not a Force
7:48
Because two masses warp spacetime and cause each one to pull the other towards it, which of the two masses were accelerating upward, and why was not the other?
Just For Fun! - Physics Why is There No Force of Gravity?
3:17
Visit for more math and science lectures!
In this video I will why there is no such thing as the force of gravity.
Next video in this Just For Fun series can be seen at:
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GRAVITY IS NOT A FORCE
6:42
We all know that Gravitation as one of the four fundamental forces of nature and this concept was introduced by Great Scientist “Sir Issac Newton”. And till now, it is believed among us. But how many of You Know that Gravitation is not just a force?? Then what is it? Gravitation has many things related to time and Space Which is stated by one of the famous Nobel Laureate Sir Albert Einstein And many of us don’t know that theory …. Which we gonna discuss in this video. So without wasting any time watch our video and get some knowledge about gravitation which you haven’t listened till now
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What Is Gravity?
2:08
People have a lot of different ideas about what gravity is: a downward force that stops you from flying off into space, an attraction smaller objects experience towards larger objects, or a mutual attraction between all masses. It is the last of these ideas that best reflects a scientific conception of gravity.
Is Gravity a Force?
6:45
For some reason, I always hear this question, and it’s about time someone made a video about it with cool animations :D I also included topics that similar videos don’t really talk about because I personally felt they gave me a deeper understanding on the topic, and I’m happy to be able to share that through this video! I also think viewers of PBS Spacetime on YouTube would find this content helpful, especially when you're watching their General Relativity series!
In answering that question, I talked about the following ideas:
GRAVITY ISN’T A FORCE
0:24 Why Einstein disagreed with Newton and didn’t see gravity as a force
The “force of gravity” we feel is actually just a consequence of earth accelerating
2:36 How Einstein’s model of curved spacetime creates an “observed acceleration”
Analogy between earth’s curvature and spacetime’s curvatures
GRAVITY IS A FORCE
3:24 Fundamental Forces of Nature
- Standard Model of Physics
- Gravity is also an interaction between matter, and no other fundamental force can explain it
GRAVITY IS AND ISN’T A FORCE
4:44 Why the Standard Model of Physics works
- Strong, Weak, Electromagnetic forces
5:17 Why General Relativity works
- GPS: Global Positioning System as a way to show how General Relativity is relevant
// CORRECTIONS: 4:58 general relativity should point to gravity isn't a force; standard model should point to gravity is a force but we haven't found the graviton //
Check out other videos I also made:
How did Albert Einstein Discover General Relativity?
A Brief History of Gravity (from Aristotle to Galileo to Newton to Einstein)
The History of Light in 10 Minutes
Does Quantum Physics Actually Have Real Life Applications?
The Interpretations of Quantum Physics in 3 Minutes (Breakthrough Junior Challenge 2018 Entry)
References:
9 Common Misconceptions About Physics. (n.d.). Futurism. Retrieved August 18, 2020, from
23.1 The Four Fundamental Forces—Physics | OpenStax. (n.d.). Retrieved August 18, 2020, from
Brian Greene Explains That Whole General Relativity Thing. (2015, November 12).
Erik Verlinde: Gravity Doesn’t Exist | Big Think. (2011, June 10).
Fundamental Forces. (n.d.). Retrieved August 18, 2020, from
Fundamental interaction | physics. (n.d.). Encyclopedia Britannica. Retrieved August 18, 2020, from
Is Gravity a Force? (2020, March 7).
Is Gravity An Illusion? (2015, June 3).
Lecture 32: General Relativity. (n.d.). Retrieved August 18, 2020, from
mischa. (2016, March 2).
Understanding gravity—Warps and ripples in space and time. Curious.
Six weighty facts about gravity. (n.d.). ScienceDaily. Retrieved August 18, 2020, from
SRGRLect7_2007.pdf. (n.d.). Retrieved August 18, 2020, from
The Four Fundamental Forces of Nature | Space. (n.d.). Retrieved August 18, 2020, from
The Standard Model | CERN. (n.d.). Retrieved August 18, 2020, from
This Crazy Physics Trick Makes Gravity Easy! (2020, March 13).
Why Can’t Quantum Mechanics Explain Gravity? | Space. (n.d.). Retrieved August 18, 2020, from
Why Is Gravity Such a Weakling? (n.d.). Retrieved August 18, 2020, from
This video is owned by Beatrice Anne C. Maquilan
Gravity Is NOT A FORCE!
7:18
Not only do people believe we live on a globe, those same people believe their “gravity” is a force!
They don’t even understand th current understanding of their own religion, Gravity is NOT A FORCE! As stated by all mainstream science. Gravity will not prevent entropy taking effect and gas pressure expanding in all directions into the claimed vacuum of space.
Mr Sensible attempts a hit piece on my video “Very Weak Vacuum Stronger Than Gravity”
see his failure here and add an intelligent comment
Gravity Doesnt Exist? - Its Only A Theory - Series 1 Episode 8 Preview - BBC Four - YouTube
2:42
Added October 2017: The title of this video has always been a bit misleading--whoever at the BBC originally named this clip was clearly looking for clicks (although my inadvertent dropping of the question mark for 4 years probably didn't help)--as the guest here, Marcus Chown, is quite specific when he says, there is no such thing as the force of gravity, not gravity doesn't exist, as gravity clearly *does* exist.
The misunderstanding stems from the fact that in general relativity, gravity is *not* treated as a force, as it is in classical Newtonian mechanics, but as something that changes the geometry of space-time on large scales, and this is the ultimate purpose of Marcus's demonstration. That said, despite not actually being a force, gravity does rather behave like one... so there's that.
Also, if you're here because you think the Earth is flat, and this video somehow bolsters that supposition...well, you're wrong on both counts.
Also: original upload can be found here:
Have a nice day!
Why gravity really is a repelling force.
8:08
Today most people believes that gravity is an attractive force. In this video I explain why that is not the case, due to the latest observations from gravitational waves. You can read a more thorough explanation online at it is free to read.
Newton vs. Einstein: 5 Facts About “The Force Of Gravity”
5:59
Some nuances of Einstein’s vs. Newton’s theories of gravity, as discussed in my videos “How Gravity Makes Things Fall” ( ), “Gravity Is Not A Force” ( ), and “Experimental Proof That Gravity Is Not A Force” ( ).
There was a 6th one that I cut for time, which is that even though general relativity describes the surface of a planet as accelerating upward, two points on opposite sides are not moving away from each other — any more than two points on the edge of a rotating wheel are moving toward each other, even though those points are accelerating centripetally toward the center. You have to let go of the idea that all acceleration is a linear speeding-up through space. That’s only one kind of acceleration, even though it’s the most familiar one. Gravitational acceleration is a change in velocity through spacetime (not just space); in “How Gravity Makes Things Fall” this is represented by the upward curving of the graph, through which inertial (falling) objects travel in a straight line.
Accelerometer animations done in Blender 2.8.
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Gravity and the Apple - Horizon - What on Earth is Wrong with Gravity - Explore BBC
3:56
In this fascinating clip from BBC's What on Earth is Wrong With Gravity, Dr Brian Cox revisits Newton's experiments with an apple in order to understand the force of gravity. Watch more high quality videos on the new BBC Explore YouTube channel from BBC Worldwide here:
Why gravity is not a force
15:21
Brian Cox Debunks Gravity
3:16
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What is Gravity? | Physics | Gravitation | Dont Memorise
2:53
Do we really know what Gravity means? What is Gravity? What are the questions we should ask regarding the concept of Gravity? Watch this video to know more!
To learn more about Gravitation, enrol in our full course now:
In this video, we will learn:
0:00 Introduction
0:50 What is Gravity?
2:10 Gravitational Force
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Is There Gravity in Space?
3:44
In a word, yes - space is packed with gravity. Hank explains how Isaac Newton described how gravity works, and why even though it seems that things are floating in space, they're still effected by gravity. Every object in the universe is constantly attracting every other object in the universe.
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Physics: The Normal Force is Not a Reaction Force to Gravity!
8:17
The Normal Force is Not a Reaction Force to Gravity!