INTRODUCTION
Early in our lives, we become aware of the tendency of all material objects to be attracted towards the earth. Anything thrown up falls down the earth. raindrops from the clouds fall down the earth.
The constituents of the universe are galaxy, stars, planets, comets, asteroids, meteroids, black holes, white dwarf, meteor etc The force which keeps time bound together is called gravitational force. The force of attraction exists between two bodies due to their masses. Gravitation is a force by which material objects are attracted towards one another
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The Greek philosopher and scientist Aristotle taught the incorrect idea that heavy objects fall faster than light objects. Modern work on gravitational theory began with work of Galileo Galilei in the late 16" century and early 17th century Galileo proved that all objects fall with same acceleration unless air resistance or some other force acts on them. Thus, a heavy object and a light object that are dropped from the same height will reach the ground at the same time.
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In 1687 A.D. English Physicist. Sir Isaac Newton published principia Mathematica, which hypothesizes the inverse-square law of gravitation.
2.1 NEWTON'S LAW OF GRAVITATION
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Based on his analysis of motion of moon, Newton compared acceleration due to gravity (g) with
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the centripetal acceleration of moon (a)
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