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Topic: Force of gravity

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	Wikinfo \| Gravity
		It is the force of gravity which is responsible for holding objects onto the surface of planets and, with Newton's law of inertia is responsible for keeping objects in orbit around one another.
		Gravity is small unless at least one of the two bodies is large, but the small gravitational force exerted by bodies of ordinary size can fairly easily be detected through experiments such as the Cavendish experiment.
		Gravity is the only one of the four fundamental forces of nature that stubbornly refuses to be quantised (the other three being Electromagnetism, the Strong Force, and the Weak Force).
	wikinfo.org /wiki.php?title=Gravity (1459 words)

	Wikinfo \| Gravity
		It is the force of gravity which is responsible for holding objects onto the surface of planets and, with Newton's law of inertia is responsible for keeping objects in orbit around one another.
		Gravity is small unless at least one of the two bodies is large, but the small gravitational force exerted by bodies of ordinary size can fairly easily be detected through experiments such as the Cavendish experiment.
		Gravity is the only one of the four fundamental forces of nature that stubbornly refuses to be quantised (the other three being Electromagnetism, the Strong Force, and the Weak Force).
	www.wikinfo.org /wiki.php?title=Gravity (1459 words)

	The Physics Classroom
		So for Newton, the force of gravity acting between the earth and any other object is directly proportional to the mass of the earth, directly proportional to the mass of the object, and inversely proportional to the square of the distance which separates the centers of the earth and the object.
		force to be decreased by a factor of 4 (2^2).
		force to be decreased by a factor of 9 (3^2).
	www.physicsclassroom.com /Class/circles/U6L3c.html (2108 words)

	Physics > Gravitational Force
		However, the main force beween common objects and the earth and between celestial bodies is gravity; this is due to the fact that they (at least one of the two) are electrically neutral to a high degree: even if in both bodies there were a surplus or deficit of only one electron for every 10
		Gravity is small unless at least one of the two bodies is large, but the small gravitational force exerted by bodies of ordinary size can fairly easily be detected through experiments such as the Cavendish torsion bar experiment.
		Gravity is the only one of the four fundamental forces of nature that stubbornly refuses to be quantised (the other three: Electromagnetism, the Strong Force, and the Weak Force, can be quantised).
	www.physics.teleactivities.net /forces/gravity.html (1438 words)

	PowerPedia:Force - PESWiki
		Force is a vector quantity defined as the rate of change of the momentum of the body that would be induced by that force acting alone.
		The SI unit of force is the newton, while the English unit of force is the pound-force.
		Conservative forces are equivalent to the gradient of a potential, and include gravity, electromagnetic force, and spring force.
	peswiki.com /index.php/PowerPedia:Force (2324 words)

	The Physics Classroom
		Gravity is the name associated with the mishaps of the milk spilled from the breakfast table to the kitchen floor and the youngster who topples to the pavement to end the first bicycle ride.
		Gravity must be understood in terms of its cause, its source, and its far-reaching implications on the structure and the motion of the objects in the universe.
		Certainly gravity is a force which exists between the Earth and the objects which are near it.
	www.physicsclassroom.com /Class/circles/U6L3a.html (581 words)

	Animation Math in Lingo - Tutorial & Demos: Gravity
		The equation for general gravity governs all objects, not just those close to the surface of the earth as is covered in surface gravity.
		Gravity acts between all objects, and its force depends on the distance between them and on their masses.
		Near the surface of the earth the acceleration caused by gravity is constant regardless of distance and mass.
	www.jmckell.com /generalgravity.html (899 words)

	Open Course : Astronomy : Introduction : Lecture 6 : Laws of Motion & Gravity
		Here, F describes the force acting, m is the mass of the object, and a is its acceleration, the change in its motion.
		The strong nuclear force is involved in the generation of energy in stars and in their explosive destruction known as type I supernovae.
		Gravity is an attractive force, and in accordance with
	www.opencourse.info /astronomy/introduction/06.motion_gravity_laws (3579 words)

	gravity
		Gravity and force five ratio varies at different places, for instance near a star there is gravity and a tremendous light energy or expansive force, but on Earth there is gravity and only residual sunlight (expansive force).
		Gravity (the actual particle attractions) are the major factor in drawing in a mass and curving the field.
		Gravity isn't curving space, it's (space is) curved because the Sun or a planet is spherical.
	www.geocities.com /xulfrepus/docs/gravity.html (1712 words)

	Funderstanding Roller Coaster Help
		The force of gravity causes a roller coaster to go slower and slower when it climbs a hill, the roller coaster is decelerating or going slower.
		This is the force that causes an object to move in a circle.
		Gravity is the force that pulls all objects in the universe toward one another.
	www.funderstanding.com /k12/coaster/help.html (2496 words)

	Force
		Our present understanding is that there are four fundamental forces in the universe, the gravity force, the nuclear weak force, the electromagnetic force, and the nuclear strong force in ascending order of strength.
		In mechanics, forces are seen as the causes of linear motion, whereas the causes of rotational motion are called torques.
		Newton's Third Law states that all forces in nature occur in pairs of forces which are equal in magnitude and opposite in direction.
	hyperphysics.phy-astr.gsu.edu /hbase/force.html (239 words)

	Spacetime, Curved Spacetime, and "Frame-Dragging"
		In Einstein's theory of general relativity, space is transformed from the Newtonian idea of a vast emptiness, with nothing but the force of gravity to rule the motion of matter through the universe, to an invisible fabric of spacetime, which "grips" matter and directs its course.
		Newton stated that the attractive force of gravity emanated from all matter, but he did not explain how it physically transmitted from one mass to another, nor how long this transmission took to occur.
		Therefore, the force of gravity could not be transmitting instantly from the Sun to the planets- it must take as many minutes to cross the distance as it took light to do so.
	einstein.stanford.edu /content/education/EducatorsGuide/Page6.html (854 words)

	The Universal Law of Gravitation
		This implies that gravity is a force that should behave in similar ways regardless of where you are in the universe.
		Gravity is a very weak force, so between common objects like you and your pencil, the force of attraction is very small because your mass and the mass of your pencil are small.
		Gravity is a force, little g is an acceleration caused by gravity.
	regentsprep.org /Regents/physics/phys01/unigrav/default.htm (504 words)

	The Force of Gravity - School for Champions: Succeed in Physical Science
		The force of gravity from the Earth on an object is the acceleration of gravity times the mass of the object.
		The force of gravity on an object caused by the mass of the Earth equals the mass of the object (m) times the acceleration caused by gravity (g).
		One surprising characteristic of the force of gravity is that the acceleration it causes in falling bodies is independent of the mass of the object.
	www.school-for-champions.com /science/gravity.htm (1539 words)

	Gravity
		This is because of weight, the force of gravity on an object at the surface of the planet.
		The reason is the force of the gravity also depends on the distance between the objects.
		Still the force of gravity on the moon is about 1/6 of what it is on Earth.
	library.thinkquest.org /CR0215468/gravity.htm (787 words)

	Gravitation - Wikipedia, the free encyclopedia
		The mass is obtained by applying the laws of gravity to the measured characteristics of the orbit.
		In space an object maintains its orbit because of the force of gravity acting upon it.
		The self-creation cosmology theory of gravity (1982) by G.A. Barber in which the Brans-Dicke theory is modified to allow mass creation.
	en.wikipedia.org /wiki/Gravity (1908 words)

	Types of Forces
		The force of gravity is the force at which the earth, moon, or other massively large object attracts another object towards itself.
		The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it.
		The spring force is the force exerted by a compressed or stretched spring upon any object which is attached to it.
	www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l2b.html (1110 words)

	Gravity Concepts and Applications
		Gravity is the weakest of the four fundamental forces, yet it is the dominant force in the universe for shaping the large scale structure of galaxies, stars, etc. The gravitational force between two masses m
		The gravity force has the same form as Coulomb's law for the forces between electric charges, i.e., it is an inverse square law force which depends upon the product of the two interacting sources.
		This led Einstein to start with the electromagnetic force and gravity as the first attempt to demonstrate the unification of the fundamental forces.
	hyperphysics.phy-astr.gsu.edu /hbase/grav.html (479 words)

	Force and Gravity (Site not responding. Last check: 2007-10-20)
		Gravity is a force that pulls objects on or near the earth's surface towards its center.
		During the day, gravity pulls the spine earthward, pushing the discs closer together, so that by the time we go to bed at night, we are between 1/4 and 1/2 of an inch shorter.
		Gravity at the equator is slightly less than at the North Pole because the Earth bulges at the equator and you are further from the center of the Earth.
	www.promotega.org /ksu30001/gravity.htm (736 words)

	Gravity is More Than a Name
		Gravity is the name associated with the reason for "what goes up, must come down," whether it be the baseball hit in the neighborhood sandlot game or the child happily jumping on the backyard mini-trampoline.
		Gravity must be understood in terms of its cause, its source, and its far-reaching implications on the structure and the motion of the objects in the universe.
		Certainly gravity is a force which exists between the Earth and the objects which are near it.
	www.glenbrook.k12.il.us /gbssci/phys/Class/circles/u6l3a.html (600 words)

	The Power of Gravity
		Because the force of gravity is an inertial force, we must first of all understand the other inertial forces existing in nature and, moreover, briefly examine what causes these forces, namely the two mechanical fundamental properties of mass; because the entire problem of space travel is based on these issues.
		The "force of gravity" exerted by the Earth is the reason that all objects on the Earth are "heavy", that is, they have more or less "weight" depending on whether they themselves have a larger or smaller mass.
		The strength of the attraction, which decreases with the square of increasing distance is represented by the distance of the curve of the force of gravity from the horizontal axis.
	www.hq.nasa.gov /office/pao/History/SP-4026/noord1.html (763 words)

	Gravity Force as perpetual energy .
		The forces have different strengths and are known, as the strong nuclear force, the weak nuclear force, electromagnetic force and gravitational force.
		One or more of these forces are found in every particle in the universe, with each particle existing as a volume of space where the force exists with an intensity that decreases as the distance from the source increases.
		Gravity seems to be magic to me. As I have stated I have been exploring the notion that all other forces are really the translation of gravity and movement of substance via particular forms and redirections.
	forum.physorg.com /Gravity-Force-as-perpetual-energy-._400.html (7784 words)

	Fundamental interaction - Wikipedia, the free encyclopedia
		The modern quantum mechanical view of the three fundamental forces (all except gravity) is that particles of matter (fermions) do not directly interact with each other, but rather carry a charge, and exchange virtual particles (gauge bosons), which are the interaction carriers or interaction mediators.
		It is widely believed that in a theory of quantum gravity, gravity would be mediated by a particle which is known as the graviton.
		Electromagnetism is a long-ranged force that is relatively strong, and therefore describes almost all phenomena of our everyday experience—phenomena ranging all the way from lasers and radios to the structure of atoms and the structure of metals to friction and rainbows.
	en.wikipedia.org /wiki/Fundamental_force (1570 words)

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