Isaac Newton proposed that gravity was a universal force of attraction between ALL objects that have mass and that the strength of the force is proportional to the product of the masses of the two objects and inversely proportional to the distance of separation between the object's centers.
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The proportionality coefficient G in this equation is called the gravitational constant. Numerically it is equal to the absolute value of the gravitational force, acting on a point body with unit mass from another similar body, which is located at the unit distance.
As stated by the respondents below, Newton, in 1687 postulated the famous inverse square law of gravitation in "Philosophiæ Naturalis Principia Mathematica" by stating that every point mass attracts every other point mass with a force that is prop...
Sir Isaac Newton discovered gravity around 1665 while he was drinking tea and observed an apple falling from a tree. Newton deduced that the force that caused the apple to fall to the ground also is the same force that causes the moon to orbit the earth. When he was growing up, Newton spent much of his time on his family farm reading.

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This is Newton’s law of gravity, in which G, the universal gravitational constant, has the value G = 6.6742(10 − 11)m 3 /(kg ⋅ s 2). Due to the inverse-square dependence on distance, the force of gravity rapidly diminishes with the amount of separation between the two masses.
G is the gravitational constant. It is equal to 6.674 * 10-11 N*m²/kg². Did you notice that this equation is similar to the formula in Coulomb's law? While the Newton's law of gravity deals with masses, the Coulomb's law describes the attractive or repulsive force between electric charges.
As discussed earlier in Lesson 3, Isaac Newton compared the acceleration of the moon to the acceleration of objects on earth.Believing that gravitational forces were responsible for each, Newton was able to draw an important conclusion about the dependence of gravity upon distance.

# How did newton find the gravitational constant

Apr 30, 2018 · Isaac Newton published a comprehensive theory of gravity in 1687. Though others had thought about it before him, Newton was the first to create a theory that applied to all objects, large and small, using mathematics that was ahead of its time. Jan 18, 2015 · F = k m 1 m 2 / r 2, leaving for others to find the value of k which makes both sides equal. Henry Cavendish was the first scientist to perform experiments which accurately determined the value of k to use to find the force of gravity between two masses, knowing the value of these masses and the distance between them. Dec 25, 2010 · In Newton's time, he spoke in terms of "geocentric gravitational constant" and "heliocentric gravitational constant", referring each to the GM product of Earth and the sun respectively. He didn't know what the actual mass (how many kilograms?) of either body was, but he could know proportions. Cavendish Experiment to Measure Gravitational Constant. by Ron Kurtus (revised 6 February 2017) The Cavendish Experiment is a clever way to measure the Gravitational Constant that is stated in the Universal Gravitation Equation. The constant was not determined until many years after Isaac Newton first formulated his equation.