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Historical Development of the Concept of Gravitational Force!

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Tristan Shivraj

on 10 September 2012

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Transcript of Historical Development of the Concept of Gravitational Force!

A look at the roles several Scientists played it in it's development!! The Development of the Concept of Gravitational Force Just to act as a little refresher to what you already know, gravitational force is basically the "force" of attraction between all masses in the Universe. What is Gravitational Force? Throughout the years ( Or centuries) several world renowned scientists came up with ways in which in which they could explain the concept of grsvitational force, from here I'll be going into detail about who they are and what they said/did. > - o -)>Off We goooo!!!! Galileo Galilei Scientist Number 1! Johannes Kepler Scientist Number 2! Isaac Newton Scientist Number 3! Albert Einstein Scientist Number 4! In Conclusion, these guys all learnt from the previous generations and formulated their theories based on that which in turn came to shape our veiws on what graviational force is today. And our perception of it will only continue to become deeper and deeper. THE END Galileo was a very influential italin Astronemer and Physicist and Philosipher. Who he was and what He did.... In 1589, Galieleo became a professor of Mathematics at Pisa, and it was around that time that he performed the famed "leaning tower of Pisa" experiment. In it, Galileo ended up dropping two balls of different masses from the tower to shaw that their time of descent was heavily dependant on their respective masses. It was through this method that Galieleo discovered that objects fall at the exact same acceleration which in turn proved Aristotle's theory of acceleration which stated an objectsfalling speed was relative to their mass. From here he eventually came up with the "Law of Free Fall", which stated that all bodies irrespective of size and composition fall freely under gravitation. In 1605, Kepler published the "laws" of planetary motion,it included three laws.
1. The orbit of every planet is an ellipse with the Sun at one of the two focus points.

2. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.

3. The squares of the orbital periods of planets are directly proportional to the cubes of the major axis (half the "length" of the ellipse) of the orbits. This ended up playing a key role in the development of the concept of gravitational force, which Scientist number 3 expanded on.... Everyone knows about the classis story behind Newton's fixation on gravity. He saw an apple fall from a tree and was inspired to study gravity. Newton's story... In it he ended up formulating four famed laws. I won't go into detail about them but to put it out their simply....
1. An object in motion will remain in motion unless acted upon by a net force.

2. Force equals mass multiplied by acceleration.

3. To every action there is an equal and opposite reaction.

4. The force of gravity between two point masses is proportional to the product of the two masses and inversely proportional to the square of the distance between them. It has been made known that Newton's laws of universal graviation doesn't fully explain the concept of Graviational Force. That's where scientist 4 comes in to the fray. How Einstein reportedly got his inspiration to study gravity was through contemplating a man falling off a building. With Newton's law of universal graviation as a basis for Einstein's most famous work "The foundation of the General Theory of Relativity" in which he came up with his own theory of relativity.
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