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Word Count: 690
The gravitational force at the surface of the planet is the force that binds all bodies to earth this force is one of the four forces recognized by physicists and this kind of force is known as gravity it attracts every celestial object to earth and though it is the most important of the forces essential for our lives it is the least comprehended of them allThroughout ages scientists have tried to solve the mystery of gravity and one of the first discoveries concerning gravity was made by Aristotle who concluded from his experiments that the downward movement of any body is that has weight had a proportional relationship between its quickness in motion and its size However this theory was accepted for centuries but after a series of experiments made by Galileo Aristotles theory was proved to be incorrect as Galileo said after a series of experimenting at the Pisa tower that bodies of different sizes fall with the same speed Later on the idea that the force is needed so as to change the motion of the body was discovered After that a great scientist was to improve all the previously accepted theories this scientist was Newton who was to make decisive advances in understanding gravity In his first law Newton said that a body in state of rest or uniform motion in a straight line will keep on moving unless acted upon by a force while in his second Newton expressed his first law in a more quantitative way as he said that force acting on a body is the rate of change of its momentum which can be put in a rule as F maWhere F is the force acting on the body while a and m are the acceleration and inertial mass of the body
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