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The planet earth taken from the outer space

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The First man who came up with the idea of gravitation was  Issac  Newton. It was an evening of 1665, when he tried to solve the mystery why Planets revolve around the Sun. Suddenly an apple fell from the tree under which he was sitting. The idea of Gravity come in his mind. He discovered not only the cause of falling apple but also the cause that make the planets revolve around Sun and the Moon around Earth.

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Newton concluded that the force which causes an apple to fall on the Earth and the force which keep the moon in its orbit are of same nature. He further concluded that there exists a force due to which everybody of the universe attracts every other body. He named this force the force of gravitation.

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Everybody in the universe attracts every other body with a force which is directly proportional to product of their masses and inversely proportional to square of distance between their  centres .

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LAW OF GRAVITATION AND NEWTON THIRD LAW OF MOTION:

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Gravitational field: 		 The region of space surrounding a body in which another body exerts a gravitational force of attraction. The direction of gravitational field around Earth is towards its  centre . Gravitational force is a non-contact force. The gravitational force become weaker and weaker as we go farther and farther away from Earth.

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The gravitational force between two identical spheres kept at a 1 m apart is 0.006673N . Find their masses .

GRAVITATION

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