Gravity Gravity An accelerometer is a device for measuring acceleration. An accelerometer inherently measures its own motion, in contrast to a device based on remote sensing. ...more on Wikipedia about "Accelerometer"
Anti-gravity is a hypothetical means of countering or otherwise modifying the effects of gravity, typically in the context of spacecraft propulsion. Such systems are limited to the realm of science fiction given the current understanding of the way gravity works, but this has not stopped legions of hopefuls from making various spinning disks and magnets in hopes of perfecting such a device. ...more on Wikipedia about "Anti-gravity"
An object's weight, henceforth called "actual weight", is the downward force exerted upon it by the earth's gravity. By contrast, an object's apparent weight is the upward force (the normal force, or reaction force), typically transmitted through the ground, that opposes gravity and prevents a supported object from falling. ...more on Wikipedia about "Apparent weight"
The Aristotelian theory of gravity was that all bodies move towards their natural place. For some objects, Aristotle claimed the natural place to be the center of the earth, wherefore they fall towards it. For other objects, the natural place is the heavenly spheres, wherefore gases, steam for example, move away from the center of the earth and towards heaven and to the moon. The speed of this motion was thought to be proportional to the weight of the object. ...more on Wikipedia about "Aristotelian theory of gravity"
In physics, the center of gravity (CG) of an object is a point at which the object's mass can be assumed, for many purposes, to be concentrated. For example, if you hang an object from a string, the object's center of gravity will be directly below the string. ...more on Wikipedia about "Center of gravity"
In the underground world of antigravity research, dynamic counterbary is a term used in the mid-1950's by antigravity researchers at the time to describe the process whereby energy is used to create a local gravitational force independent of the Earth's. A passenger aboard a ship using such a system would have the ability to travel at any speeds in our atmosphere without feeling the slightest force of movement. ...more on Wikipedia about "Dynamic counterbary"
Falling is movement due to gravity. By analogy, falling has other uses not directly related to gravity. ...more on Wikipedia about "Falling" Are you ready for www.shortopedia.com?
Free-fall or free fall in the strict sense is the condition of acceleration which is due only to gravity. In other words, the objects undergoing free fall experience only one force: their own weight. ...more on Wikipedia about "Free-fall"
When an object is free-standing, this means that it is not fixed in any way to a surface. It relies solely on the force of gravity to keep it in place, and thus can usually be moved about if not too heavy. ...more on Wikipedia about "Free-standing"
A geoid is an equipotential surface which (approximately) coincides with the mean ocean surface. It is often referred to as a close representation or physical model of the figure of the Earth. According to C.F. Gauss, it is the "mathematical figure of the Earth", in fact, of the gravity field. It is that equipotential surface (surface of fixed potential value) which coincides on average with mean sea level. ...more on Wikipedia about "Geoid"
In physics, gravitational acceleration is the acceleration of an object caused by the force of gravity from another object. An interesting fact is that any object will accelerate towards a large object (like the earth) at the same rate, regardless of the mass of the object. On the surface of the Earth, all objects fall with an acceleration of one gee, which is approximately equal to 9.8 m/. ...more on Wikipedia about "Gravitational acceleration"
The gravitational binding energy of an object consisting of loose material, held together by gravity alone, is the amount of energy required to pull all material apart, to infinity. It is also the amount of energy that is liberated (usually in the form of heat) during the accretion of such an object from material falling from infinity. ...more on Wikipedia about "Gravitational binding energy"
The constant of proportionality is called , the gravitational constant, the universal gravitational constant, Newton's constant, and colloquially big G. The gravitational constant is a fundamental physical constant which appears in Newton's law of universal gravitation and in Einstein's theory of general relativity. In some other theories the constant is replaced with a scalar value. See Rosen bi-metric theory of gravity. ...more on Wikipedia about "Gravitational constant"
Physicists have long speculated about the gravitational interaction of antimatter. Due to inherent technical difficulties, no laboratory experiment has conclusively measured the gravitational acceleration of antimatter. Regardless, most physicists support the theory that antimatter falls in exactly the same manner as normal matter. However, in recent years the theory that matter and antimatter would gravitationally repel each other has gained some theoretical backing. ...more on Wikipedia about "Gravitational interaction of antimatter"
In physics, gravitational potential is the potential energy per unit mass of an object due to its position in a gravitational field. The gravitational potential due to a point mass M is ...more on Wikipedia about "Gravitational potential"
Gravity is a force of attraction that acts between bodies that have mass. It is a physical phenomenon of fundamental importance, profoundly affecting the workings of the world around us and the universe beyond. Most familiarly, it is the gravitational attraction of the earth that endows objects with weight and causes them to fall to the ground when dropped. In fact, gravity is also 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. Gravity 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 tides, and for various other natural phenomena that we observe. ...more on Wikipedia about "Gravity"
Established in 1948 by businessman Roger Babson (also founder of Babson College), the Gravity Research Foundation was an organization designed to find ways to block or reduce the effect of gravity. It closed in the late 1960s, although it has maintained an annual contest rewarding essays by scientific researchers on gravity-related topics. ...more on Wikipedia about "Gravity Research Foundation"
In physics, a gravity well is a distortion in space-time caused by a massive body such as a planet. The term is a reference to the 3-dimensional analogy of this phenomenon: an extrusion of an otherwise 2-dimensional sheet. An actual gravity well involves higher-dimensional bending. ...more on Wikipedia about "Gravity well"
In physics, an inverse-square law is any physical law stating that some physical quantity or strength is inversely proportional to the square of the distance from the source of that physical quantity. ...more on Wikipedia about "Inverse-square law"
Low-G condition is a phase of aerodynamic flight where the airframe is temporarily unloaded. The pilot - and the airframe - feels little or no gravity because the aircraft is in free-fall or decelerating vertically at the top of a climb. It may also occur during some horizontal turning manoeuvres. ...more on Wikipedia about "Low-G condition"
The Lunar theory is an explanation by mathematical reasoning of perturbations in the movements of the moon founded on the law of gravitation. ...more on Wikipedia about "Lunar theory"
In theoretical physics, particularly in discussions of gravition theories, a Mach principle is one of several dozen alternative formulations of vague hypothesis first suggested by the physicist and philosopher Ernst Mach in 1893. ...more on Wikipedia about "Mach's principle"
In theoretical astrophysics, the Nordtvedt effect refers to the relative motion between the Earth and the Moon which would be observed if the gravitational self-energy of a body contributed to its gravitational mass but not its inertial mass. If observed, the Nordtvedt effect would violate the strong equivalence principle, which shows that an object's movement in a gravitational field does not depend on its mass or composition. ...more on Wikipedia about "Nordtvedt effect"
Physical geodesy is the study of the physical properties of the gravity field of the Earth, the geopotential, with a view to their application in geodesy. ...more on Wikipedia about "Physical geodesy"
The Pioneer anomaly or Pioneer effect refers to the observed deviation from expectations of the trajectories of various unmanned spacecraft visiting the outer Solar system, notably Pioneer 10 and 11. As of 2005, there is no universally accepted explanation for this phenomenon; while it is possible that the explanation will be prosaic—such as thrust from gas leakage—the possibility of entirely new physics is also being considered. ...more on Wikipedia about "Pioneer anomaly"
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