# NEWTON'S LAW OF UNIVERSAL GRAVITATION

Jun 21st, 2015
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Gravity is a force that exists throughout the Universe. It makes things fall down when you drop them, it keeps satellites in the orbits, it leads to tides on Earth, it causes stars and black holes to form and it will ultimately determine the fate of the Universe. Newton determined the gravity is a force of attraction that exists between any two bodies and that it varied as the inverse of their separation squared and in direct proportion to their masses.

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Chapter 6GravityNewtons law of universal gravitation F = NEWTON'S LAW OF UNIVERSAL GRAVITATIONGravity is a force that exists throughout the Universe. It makes things fall down when you drop them, it keeps satellites in the orbits, it leads to tides on Earth, it causes stars and black holes to form and it will ultimately determine the fate of the Universe.Newton determined the gravity is a force of attraction that exists between any two bodies and that it varied as the inverse of their separation squared and in direct proportion to their masses. It is a very weak force and only becomes noticeable when at least one of the objects is extremely massive. The force acts equally on both masses.F = where F = gravitational force on each mass (N)G = universal gravitational constantM, m = masses (kg)R = distance between the centres on the masses (M, m)The Universal Gravitational constant G = 6.67 10-11 N m2 kg-2Gravitational field, using g = GRAVITATIONAL FIELDSFor a body on, or above, the surface of the Earth, the mass of the Earth may be considered to be concentrated at its centre.Gravitational fieldof Earth Field strength is weaker as the field lines spread out.The force between the two bodies = weight of small body = mg g = Thus the acceleration due to gravity at then surface of the earth, g, is determined by the mass of the earth and the radius of the earth, not th

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