Sir Isaac Newton's Law Of Universal Gravitation Essay

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Gravity if one of the four fundamental forces in the universe. Though the fundamental principles of it eluded scientists until Sir Isaac Newton was able to mathematically describe it in 1687 (Eddington 93). Gravity plays a serious part in everyday actions as it keeps everything on the ground; without gravity everything would be immobile unless a force was applied (then it would move infinitely because there would be no force to stop it).
     Perhaps, the best place to start then would be with such a simple item as an apple (after all it is what "sparked" Newton's creativity). The apple is one of the two curiosities (the other being the moon) that led Newton to discover The Law of Universal
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So the force of the earth pulling the apple to the ground is proportionally the same as the force the apple exerts back on the earth.
     Now Johannes Kepler lived some forty-five years before Isaac Newton.
And he showed that the orbits of the planets in our solar system were elliptical.
When the time of Newton came around he mathematically proved that, if Kepler's
First Law was true, then the force on a planet varied inversely with the square of the distance between the planet and the sun. He did this using Kepler's
Third Law (Zitzewitz 160). The distance in this formula is from the center of the masses and is the average distance over their entire period. It is also important to note that the force acted in the direction of this line (an important factor when dealing with vectors) (Zitzewitz 160).
     Newton, confident that his idea of all objects exerting a force back on
Earth, devised a formula for Universal Gravitation. It is important to note that Newton was not the first to think of Universal Gravitation, he was just the first one to make considerable and remarkable proofs for it based on mathematical explanations. He said that if force is relative to the mass of an object and it's acceleration then the force between two objects must also be the same. Thus he came up with the first part of the equation. Also, as he had
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