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Gravity
One of the four fundamental interactions, gravity is responsible for the fact that any objects with mass attract one another. According to general relativity, it is a space time curvature, but according to quantum mechanics it is the result of exchanges of virtual gravitons.
4,784 Questions
Is there anywhere on earth without gravity?
Gravity is everywhere in the universe. There's no getting away from it, anywhere.
Who is the British scientist that discovered gravity?
Gravity was discovered not by a British scientist, but by the first living thing
that had a brain and fell down.
Sir Isaac Newton was the British genius thinker who captured the entire nature
and behavior of gravity in the formula
F = G M1M2/R2
What is the amount of gravity between an object and a planet?
The force of gravity between any two objects is
G x (mass of one object) x (mass of the other one)/(distance between them)2 If the masses and distance are in SI (metric) units, then G is 6.67 x 10-11 ,
and the force is in newtons. (about 4.45 newtons makes 1 pound.)
It doesn't make any different whether the two objects are a planet and an ant, a
planet and a star, two ping-pong balls, two people, or a galaxy and a feather.
That's the amount of gravitational force that's trying to pull them together.
Why doesn't Dark Energy effect things on a smaller scale then galaxies?
We don't know.
"Dark energy" and "dark matter" are more-or-less euphemisms for "we have no idea what the heck is going on here."
In the case of dark matter, the "here" has to do with the rotation of galaxies. If Newton's Law of Universal Gravitation is even approximately correct on a galactic scale, then galaxies don't rotate properly. We can fix this problem in one of two ways: we can assume there's a lot of mass that's hidden from us and only interacts via gravity (and, possibly, via the weak force, which turns out to only act over such tiny distances that we can completely ignore it for something the size of a galaxy ... or for that matter, the size of a grain of sand), or we can assume Newton's equations are just the small-scale limit, and that a different law applies for objects the size of galaxies. Both approaches have been tried; both are consistent with observed data, but neither has been absolutely proven correct.
In the case of dark energy, "here" has to do with the cosmological constant. When Einstein was attempting to work out his equations about how the universe behaves, he found it necessary to add an arbitrary parameter in order to get the equation to agree with observations. Actually, the model would have been consistent with what was then known about the universe if you assumed it was expanding. Einstein didn't like that for philosophical reasons, and put in the constant.
We now know the universe is expanding, whether we like it or not, but we also know more about how it's expanding, and it turns out that having a non-zero value for the cosmological constant makes the model work better. Scientists don't like inserting random parameters into equations without at least trying to explain where they come from, and "dark energy" is one attempt to explain the fact that the cosmological constant does not appear to be zero.
The reason it "doesn't affect things on a smaller scale than galaxies" ... according to theory, it does. It's just such a very, very tiny effect that on the small scale ... and by "small scale", I mean anything not mind-bogglingly huge, not just galaxy-sized or ever galaxy cluster sized but more like "the spacing between superclusters" sized ... then the effects are utterly indetectable against the background of gravity and electromagnetic forces.
Answer2:
Dark Energy does effect things smaller than galaxies!
Dark Energy effects things on every scale from Cosmos to atom. Dark Energy is involved in every spec of mass that moves, it is the product of Momentum and the speed of light, cP. Momentum is everywhere from the neutrino to the galaxies. Momentum energy, Dark Energy is everywhere there is Momentum.
Einstein's original conception was working on a stationary cosmos involving galaxies.. His mathematics did not show the stationary condition, so he added the Cosmological Constant. This was the correct idea. Einstein was looking for a centrifugal force to counter the centripetal force of gravity. Others assumed the equations were correct and the cosmos was dynamic either expanding OR contracting. The Big bang Theory and The red shift data was combined to conclude that the cosmos is expanding.
The more correct theory i call Quaternion Physics. The cosmos is not expanding and the Dark Energy is the source of the centrifugal force to bring about Stationary. The Dark Energy is the Momentum Energy, cP where P =mV, the Momentum vector. The Momentum is everywhere large and small sizes. The Dark Energy cP is also everywhere and large an small. It can be seen that Dark Energy cP = mvc is larger than "regular' energy mvv.
The centrifugal force comes from the Divergence of the vector energy
DEL.cP = -cp/r cos(P). The centripetal force is vp/r = mv2/r, the balance of these two forces give the Continuity Condition and the derivation of the red shift;
vp/r=cp/r cos(P) gives v/c = cos(P) the source of the red shift.
Thus the red shift is everywhere orbits are stable and indicate the Continuity Condition (the scalar forces summing to zero) and the Fermion Condition.
The Quaternion Physics answers the observations without ghost energy and matter. The Gravitational Energy is W= -mGm/r + cmV= -vh'/r + cP where the scalar/Boson energy is -mGM/r = -vh'/r and the vector/Fermion energy is cmV=cP the Momentum energy is the so-called "Dark Energy", Dark Energy is everywhere from the atom to the Cosmos; e.g. W = -vh'/r + cP where the electrons and Photons have the Momentum energy, cP.
*h'=h/2pi.
Why do bottle rockets have triangular wings instead of rectangular?
Triangular wings provide stability and control during flight due to their shape creating less drag. This design helps the bottle rocket maintain a straight trajectory and prevents it from spinning or veering off course. Additionally, the triangular shape allows for easier assembly and attachment to the rocket body.
Why do you notice the pull of earths gravity but not the pull of the suns gravity?
The center of the sun is very roughly 23,000 times as far from you as the center
of the Earth is.
That means that the gravitational force between you and each pellet of mass in
the sun is roughly
1/(23,000)2 = 1/(540 million) = 0.00000000185 as much as
the gravitational force between you and each pellet of mass in the Earth.
The sun has roughly 333,000 times as much mass as the Earth has. So the total
gravitational force between you and the sun is
333,000/(540 million) = 0.000617 as much as
the total gravitational force between you and the Earth.
Is mass and weight affected on the moon by gravity?
Yes, both mass and weight are affected by gravity on the moon. Mass remains the same because it is a measure of the amount of matter in an object, while weight changes because it depends on the gravitational force acting on an object. As gravity on the moon is weaker than on Earth, a person would weigh less on the moon compared to on Earth.
How did Robert Hooke find out about gravity?
Robert Hooke did not discover gravity. Gravity was famously discovered by Sir Isaac Newton, who developed the law of universal gravitation. Hooke did contribute to the understanding of forces and motion, but his work primarily focused on microscopy and biology.
Does the sun's rotation cause gravity?
The sun's rotation does not cause gravity. Gravity is a fundamental force of attraction between objects with mass, and it is always present regardless of whether an object is rotating or stationary. Rotation affects other aspects of a celestial body's behavior, such as its shape and magnetic field, but not the force of gravity itself.
Yes, space itself does not have gravity as it is a vacuum. However, massive objects like stars and planets create gravity due to their mass. This gravity causes objects to be attracted towards them in space.
Is it possible to place an object into a stable orbit that doesn't cross the equator?
I'm not sure what you mean by "a stable orbit". The Earth's center of mass ...
nominally the Earth's center ... always lies in the plane of any Earth orbit, so
the ground track of the orbit must either cross the equator or coincide with it.
Is there a point between the earth and the moon at which there is no gravity?
Yes, they are called Lagrange points. Between any two objects in space there are 2 points in between them at which the pull of gravity from both cancel each other out.
Does mass change depending a person's weight?
Mass is an intrinsic property of an object that remains the same regardless of the object's location or the gravitational force acting upon it. Weight, on the other hand, depends on the gravitational force and is determined by the mass of an object and the acceleration due to gravity. So, a person's mass does not change, but their weight can vary depending on the gravitational force.
Why doesn't mercury get sucked in the suns gravity?
Mercury does get affected by the sun's gravity, which keeps it in orbit around the sun. However, the speed at which Mercury orbits the sun, along with its distance from the sun, allows it to maintain a stable orbit rather than being pulled in completely.
What does zero gravity affects the Human body?
Zero gravity can cause muscle atrophy, decrease in bone density, fluid shift to the upper body, and changes in cardiovascular function due to the lack of gravity pulling blood towards the legs. Astronauts in space experience these effects and must exercise regularly to counteract them.
What is Saturn's value for acceleration due to gravity?
Acceleration due to gravity on Saturn = 11.171 m/s2
(9.807 m/s2 on Earth)
Google Gravity is a fun project from the developers at Mr. Doob that allows users to experience Google's search functionality in a different way. When you search for something in Google Gravity, results will appear as if they are being affected by gravity, causing them to fall and bounce around the screen. It's a playful and interactive way to explore the capabilities of web design and programming.
Is there gravity on the space station?
Yes, there is gravity on the International Space Station (ISS), but it is not due to the station being in Earth's orbit. The sensation of weightlessness experienced by astronauts aboard the ISS is because they are in a state of constant free fall towards Earth, creating the effect of microgravity.
Why is it that the earth is not affected by the Moon's gravity?
Earth is affected by the moon's gravity. The moon's gravity exerts just as much force on Earth as Earth's gravity does on the moon, but since Earth is far more massive, it undergoes far less acceleration.
What in the universe has gravity?
Everything with mass or energy experiences gravity, from planets and stars to objects as small as a single atom. Gravity is a fundamental force in the universe that causes objects to be attracted to each other.
How do meteors fall to earth if there is no gravity in space?
While there is no gravity in space, gravity from Earth still affects objects in close proximity. Meteors fall towards Earth due to its gravitational pull. As the meteor enters Earth's atmosphere, it experiences friction which heats it up and causes it to glow, creating a meteor trail.
Where the gravitational field strength is maximum?
value of acceleration due to gravity is maximum at the surface of earth. So the gravitational field strength.
as g'=g(1-d/R)
at surface d=R
so d=R
so g'=g
at earth's centre g=0. Its value decrease with decrease or increase in height.
as:
g'=g(1-2h/R) ......for height h
and
g'=g(1-d/R) .....for depth d
Do stems grow in or against gravity?
Stems grow against gravity due to a process called phototropism, where they bend towards light. This phenomenon allows plants to optimize photosynthesis by positioning their leaves to receive more sunlight. Additionally, stems typically grow upwards against gravity to reach for resources such as light and nutrients.
Is the center of gravity is always in the body?
For a single body, the center of gravity (center of mass) must be within the object. It is the single point at which all of an object's mass can be considered to act.
For multiple bodies in a system, the center of mass can fall within a body or anywhere between bodies. The joint center of mass is called the "barycenter."
What direction does earth pull objects?
The force of mutual gravitational attraction between the earth and any other object
pulls the object toward the center of the earth, and pulls the earth toward the center
of the object. Both pulls have equal strength.
