Gravitational Force

Newtons Law of Universal Gravitation Apples had a significant contribution to the disco very(prenominal) of gravitation. The position physicist Isaac Newton (1642-1727) introduced the term gravity after he saw an apple dropping onto the ground in his garden. Gravity is the force of attraction exerted by the mankind on an object. The moon orbits around the earth because of gravity too. Newton later proposed that gravity was just a particular case of gravitation. Every mass in the universe attracts every other mass. This is the main idea of Newtons Law of Universal Gravitation. A portrait of Issac Newton. Courtesy of AIP Emilio Segre VisualArchives, W. F. Meggers Collection. The jurisprudence was published in Newtons famous work, the Principia ( numeral Principles of Natural Knowledge) in 1687. It states that every particle in the universe exerts a force on every other particle along the short letter joining their centers. The magnitude of the force is directly proportional to the product of the masses of the two particles, and inversely proportional to the square up of the distances between them. In mathematical wrong By team C007571, ThinkQuest2000. where and are the masses of the two particles, r is the distance between the two masses, F is the gravitational force between hem, and G is the usual gravitational constant, . The above equation only organises the gravitational force of the simplest case between two particles. What if there are more than two? In that case, we calculate the resultant gravitational force on a particle by finding the vector sum of all the gravitational forces acting on it By adding the unit vector to the equation, F now processes a direction Interactively test the effects of gravitation on planets Newton derived the relation in such a way that F is proportional to m because the force on a falling body (remember the apple? ) is directly roportional to its mass by Newtons 2nd law of motion F = ma, so F is proportional to m . When the earth exerts a force on the falling body, by Newtons 3rd law of Motion, the falling body exerts an equal and opposite force on the earth. Therefore, the gravitational force F is proportional to both the masses of the falling body and the earth, i. e. and . The inverse square relationship , was justified by observing the motion of the moon. View of a full moon. Courtesy of NIX NASA Image Exchange Photo ID AS11-44-6667 Date interpreted 07/21/69 Johannas Kepler Courtesy of AIP Emilio Segre Visual Archives. Newtons Law of UniversalGravitation has successfully explained the observation on planetary movements made by the German astronomer Kepler (1571-1630). It works short well in the world of ordinary experience and has dominated for about 250 years. It, however, shows its shortcomings when explaining the unusual orbit of Mercury around the Sun. It breaks down when the gravitational forces get very strong or involving bodies moving at speeds near that of light. Einsteins General T heory of Relativity of 1915, which has overcome this limitations of Newtons Law, was able to demonstrate a better theory of gravitation. billet Gravitational potential energy