why is gravity a force?
919770
It is a force that pulls you to the earth.
475251
If I remember correctly from my high-school physics class, it's a combination of gravity and one of Newton's laws of motion - the one that says "an object in motion stays in motion unless acted on by an outside force." So that force keeps it moving around and gravity keeps it from just flying off into space.
335410
All masses have gravity, because the earth is such a great mass its gravitational pull is very strong. Because the sun has such a great mass its gravitational pull is likewise very strong. If gravity were to change it would be a result of a change in the mass of the object that is belongs to. The sun, for example is a star and will die out some die and with it will go its gravitational pull.
99456
Einstein alluded about forces saying that they are fictitious.This make sense because forces do not exist unless there is an interaction between two entities.\nThe magnetudes of interaction depends on the densities of the masses and their volume.The greater the densities the greater the interaction.Thus we can categorize them.\nHowever ;the mechanisms involved is the same in all interactions!Einstein Related this mechanism to a curvature.\nHe had discovered when a force comes into being it comes  from a common  mechanism(.A force is a force ). Force only come into being only as pairs.A force cannot exist by itself no more than a magnet having a single pole.\nUnfortunately ,He had the basis for a Unified Theory and did not realize it.\nAs far what has been measured in the interaction of micromasses or micromasses,I  dont believe there is anything exact.Only approximtions.\nThe phenomena of gravity apply to both micromasses as well as Macromasses.This is the only thing that is Realistic.\nIn other words Electrical phenomena as well Gavity are all one and the same Phenomena.\nYou may not agree with it but its a more realistic answer than resorting to the aphabetic soup of forces that the Physists have concocted as saying that they are different Phenomenae.\nIf you dont understand about their description of weak,strong nuclear forces, dont feel bad. I doubt that they fully understand it themselves!
915872
Gravity is defined in a new term.  That is the latest report\n    of the atomic relativities of the quasar versus the quantum\n    in an isolated directive.  Defined by the mineral interactions.\n    What?  Gravity has the interactive quantities added to the\n    average force of one planet attracts to another Plus the ionic\n     pentanmeters(depends on the substance with conditions).\n    So gravity is present in all materials if left in free space, or put\n     into orbits, or put on a plane.  This last set is the theoretic\n     gravity of space infinitives to the nth degree, showing that all\n     materials have the origin of gravity values as established at\n     the desk of the elements chart, and its properties.  The flight\n     of planets is a true measure of gravities, showing such things\n     as anti-gravity points like in a space capsule.  The interaction\n      really never out drives the elements chart standard.
842967
Gravity is a condition of the space-time continuum which is associated with mass.  Every object which has a mass will have a gravitational attraction to any other close object with a mass.\n\nThe planet Earth has a mass, and therefore has a "gravity."
632008
Gravity, its weight, friction\nThat's about it.
42452
Tell them that the mass is the actual ammount of stuff(matter) in a given object.  Weight is the force of gravity pulling on the stuff (mass or object).  The gravity is caused by the ammount of mass in the other object.  So on earth it has a constant mass so the ammount gravity on an object is constant.  Therefore on earth we can measure the mass of an object using its weight.
681558
Gravity is not a chemical substance like Hydrogen. Its the inherent property of any object. It is the force through which each object exerts a pull on the objects around it. The greater the object the greater the force. So we stick to the earth surface cause it is huge and has enough power to hold us on the surface. \n\nSimilarly, Sun pulls all the object towards it, but since earth (and other planets are in motion) they have an outward force too. So the sun's gravitational force and this outward force of earth balance out.\n\nPS: even earth exerts gravity on sun but its so small as compared to the sun that the force is negligible
46750
It depends on who you ask (sort of).\n\nAccording to Newton gravity is a force proportional to the mass of the two objects involved, and inversly proportional to the square of their distance.\n(To see the relevant equations go here: \nhttp://scienceworld.wolfram.com/physics/Gravity.html )\n\nFrom our perspective we typically drop things much less massive than the Earth (apples, bicycles, pizzas) and very close to the surface of the Earth (that is, almost at the same distance from the Earth's center) the result is that things fall with the same acceleration 9.8 m/s^2 regardless of their mass. In other words, drop an apple and a bulldozer from the same distance and (if air resistance is ignored) they will hit the ground at the same time.\n\nHowever, if you ask Einstein then the nature of gravity is more complex (although in the limit of apples and bulldozers near the surface of the Earth, the same 9.8 m/s^2 pops out of Einstein's theory).\n\nAccording to Einstein's Theory of General Relativity gravity is a "warping" of space time. Mass will bend space-time, and this bending will influence the way in which other objects move.It is sort of summed up in the expression: "Mass tells space what to do, and space tells mass where to move."\n\nSo for Einstein, in some sense, there is no force of gravity (although it certainly seems that way if you fall out of a building).\n\nIf you ask leading physics people today they will say that Einstein was on the right track all right, but General Realtivity stills needs to be work nicely with the other major idea of modern physics, Quantum Mechanics.\n\nThere is still a long way to go in making QM and GR part of a single consistent theory. But it is a very powerful goal since it would unite gravity with the forces which are explained quite well with QM (electromagnetism, the strong nuclear force, and the weak nuclear force.)\n\nIn QM forces are carried by force particles. Photons, for instance, are the force carrying particles of electromagnetism. The force carrying particle of gravity - something which has not been discovered - is called the graviton. So, in modern physics, if you have a graviton then you are back to gravity being a force. \n\nOf course efforts to successfully unite GR and QM are still going on. String theory, is one way that is popular these days.\n\nSo the answers are:\nNewton - gravity is a force based on mass and distance\nEinstein - gravity is the warping of space-time\nUltra-Modern - gravity is a force carryed by gravitons
911261
well, we know that F = ma, and with gravity, F = mg\n\nWhat causes this force? gravitational attraction, which is defined by:\n\nF = Gm1m2/r^2\n\nSo, we can say that mg=Gm1m2/r^2, where r is the distance between 2 objects (1 and 2).\n\nnow, lets solve it for g\n\ng=Gm/r^2\n\nthis shows us that g varies inversely with the SQUARE of the distance.  So the distance between the earth and an object would need to be r*(sqrt2)
496244
In the context of molecular mechanics, a force field (also called a forcefield) refers to the functional form and parameter sets used to describe the interactions (potential energy and forces) within a system of particles (atoms or similarly sized objects). It is independent of the system's electron configuration. A force field can be empirical, derived from higher-level modelling (e.g. quantum chemical studies), or even heuristic.\n\nThe name "force field" is a bit of a misnomer, because the "force fields" are actually potential functions, and the actual physical force field is a negative gradient of the potential.\n\nIn physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force.[1], or time-space itself is envisioned as discrete in nature, or both.\n\nThe gravitational attraction of the Earth endows objects with weight and causes them to fall to the ground when dropped. Moreover, gravitation is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the earth and the other planets in their orbits around the sun, the moon in its orbit around the earth, for the formation of tides, and for various other natural phenomena that we observe.
50990
newtons are the unit of force.  the second law of motion says that F=ma, where F is the force, m is the mass and a is the acceleration of the mass.   so, you need to know the acceleration!\n\nif you are talking about an object on earth, then the acceleration is "g", which is 9.8 m/s^2.  so multiply the mass times that acceleration to get the force with which gravity pulls on that object, in newtons.
261529
Gravity is a force which keeps you stay in groud. For instance if you drop a pencil it falls to earth, if you through a ball to sky the gravity slows the upward thrust give by you to the ball & then pull it back to ground. Like this you can gine "n" no. of examples
270647
Gravity is a term to explain a phenomenon. The theory of gravity is a theory to explain a fact. The pull between bodies(known as gravity) is a fact.\n\nWe can measure this pull with a good degree of accuricy since the days of newton. Yet untill this moment we don't have a complete explanation as to why gravity occurs!\n\nNewton didn't really explain gravity, he just offered methods to measure its effect. Modern physics describe gravity as a result of the bend in the fabric of space-time.More theories will develop later.\nThat's what science is about, offering explanations, then making them better with time, then even better and so on. There is no best of final explanation ever, but there are always better ones that could be used to make life easier.
415426
Force is some thing that alters the state of things. According to Newton's second law of motion force produce acceleration in a mass object - either by putting it to motion from a state of rest or from a slower speed, or by slowing things down. In either way F= ma or F = -ma (slowing down).Where F is force, 'm' is unit mass, and 'a' stands for acceleration, and '-a' for deceleration.\nBasically it is about change - change in inertia.\n\nWhereas momentum M= mv is not about change in inertia but about inertia itself. You see every thing in universe if composed of mass and energy. Energy  of a stationary object of of 1 kg is not same as that of an object of same mass moving with certain speed.\nSo momentum is a product of mass and velocity of the object.\nAnd force in lay man's term is a means of transferring energy from on object to an other.
1058239
Yeah, force is just energy applied on a particle. Force per time is power.