Absolutely all material bodies, as being directly on the Earth and in the universe, are constantly attracted to each other.The fact that this interaction is not always possible to see or feel, says only that the attraction is in these particular cases, relatively weak.
interaction between material bodies, which is their constant quest to each other, according to the basic physical terms, is called gravitational, while the phenomenon of gravity - gravity.
phenomenon of gravitation is possible because around absolutely any material object (including around the person) there is a gravitational field.This field is a special kind of matter, from the effects of which nothing can be protected with the help of which one body acts on another, causing the acceleration of the center of the source of the field.That was the basis of the gravitational field is formulated in 1682 the English naturalist and philosopher Newton's law of universal gravitation.
basic concept of the law is the force of gravity, which, as mentioned above, is none other than as a result of the impact of the gravitational field at one time or another material body.The law of gravity lies in the fact that the force with which the mutual attraction of bodies on Earth and in outer space, depends on the product of the mass of the body and is inversely related to the distance separating these objects.
Thus, the force of gravity, which was defined more by Newton himself, depends on two main factors - masses of interacting bodies and the distance between them.
evidence that this phenomenon depends on the mass of the substance can be found by studying the interaction of the Earth with the surrounding bodies.Soon after Newton's other famous scientists - Galileo - has convincingly shown that the freefall our planet sets all bodies are absolutely the same acceleration.Perhaps it is only when the gravitational force of the body to the earth depends on its mass.Because, really, in this case, by increasing the weight several times exactly the same factor will increase and strength of gravity, acceleration is thus remain unchanged.
If we continue this idea and consider any interaction between the two bodies on the surface of the "blue planet", it can be concluded that each of them on the part of our "Mother Earth" has one and the same force.At the same time, based on the famous law, formulated in the same Newton, we can confidently say that the magnitude of this force will depend on the body weight, so the force of gravity between the two bodies is directly dependent on the product of their masses.
To prove that the force of gravity depends on the gap between the bodies, Newton had to bring in an "ally" Moon.It has long been established that the acceleration with which a body falls to the ground is approximately equal to 9.8 m / s ^ 2, but the centripetal acceleration of the moon in relation to the planet as a result of a series of experiments was found to be only 0.0027 m / s ^2.
Thus, the force of gravity - is the most important physical quantity, which explains many of the processes taking place on our planet, and in the surrounding space.
