## gravitational force Quick reference

### The Concise Oxford Dictionary of Mathematics (6 ed.)

...gravitational force The force of attraction that exists between any two bodies, described by the inverse square law of gravitation . See also gravity...

## gravitational force Quick reference

### A Dictionary of Space Exploration (3 ed.)

...gravitational force ( gravity ) One of the four fundamental forces of nature ( see gravity ), the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. The gravitational force is the weakest of the four forces, but acts over great distances. The particle that is postulated as the carrier of the gravitational force is the...

## gravitational force Quick reference

### A Dictionary of Mechanical Engineering (2 ed.)

...gravitational force (Unit N) A force of attraction that exists at all points outside the Earth, directed toward the centre of the Earth and of magnitude GM/r 2 on unit mass, where G is the gravitational constant , M ≈ 5.983 × 10 24 kg is the mass of the Earth, and r ≈ 6.365 × 10 6 m is the distance from the centre of the Earth. On the surface of the Earth the gravitational force on a mass of 1 kg is about 9.81 N. See also Newton’s law of gravitation...

## gravitational force Quick reference

### A Dictionary of Astronomy (3 ed.)

... force The force of attraction, F , that exists between all bodies. For any two bodies, it is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them. The constant of proportionality is G , the universal gravitational constant. Expressed in mathematical form, F = Gm 1 m 2 / d 2 , where m 1 and m 2 are the two masses and d is their distance...

## uniform gravitational force Quick reference

### The Concise Oxford Dictionary of Mathematics (6 ed.)

...uniform gravitational force A gravitational force , acting on a particular body, that is independent of the position of the body. For example, the gravitational force acting on a particle of mass m near the Earth’s surface, assumed to be a horizontal plane, can be taken to be − mg k , where k is a unit vector directed vertically upwards and g is the magnitude of the acceleration due to...

## non-gravitational force Quick reference

### A Dictionary of Astronomy (3 ed.)

...gravitational force An effect that accelerates or decelerates a comet’s motion, changing its orbital period. Such forces are caused by jets of gas emerging from active regions on the surface of the nucleus, giving a rocket-like effect. Non-gravitational forces are most marked when the nucleus is highly active, close to perihelion, leading to uncertainties in subsequent returns for some periodic comets . They are, for example, responsible for systematic changes in the perihelion time of Comet Encke , and the apparently delayed 1992 return of Comet ...

## gravitational force

## uniform gravitational force

## non-gravitational force

## Religion and Liberty Reference library

*Mehdi Bazargan*

### Liberal Islam: A Sourcebook

... In general, an object in a given force field will, of necessity, behave in a calculable and predictable way. For any object, whether a stone, a plant, or a human society, force means movement. For example, a piece of metal that is released within earth's gravitational field will fall in a straight line. Its position and velocity are calculable at every moment. Similarly, the behavior of a human being who is motivated only by the demands of his or her appetite is predictable. However, if in the place of one force, two or more forces are introduced—for...

## Colossians Reference library

*Jerome Murphy-O'Connor, OP and Jerome Murphy-O'Connor, OP*

### The Oxford Bible Commentary

...meaning evaporates on inspection. Lightfoot ( 1904 : 154 ) perfectly catches the spurious profundity of the expression by commenting ‘He impresses upon creation that unity and solidarity which makes it a cosmos instead of a chaos’. How exactly is this achieved? ‘The action of gravitation … is an expression of His mind’! Paul becomes completely serious in his introduction to the second strophe. The church must be characterized by the organic unity of a living ‘body’ ( v. 18 a ). The insight is but an extension and clarification of ‘you are all one person in...