Physics

The Moon

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The mutual gravitational force between two objects is inversely proportional to the square of the distance between their centers of mass. That goes for any two objects in the universe, regardless of their relative size or mass, the distance between them, how they're moving, or where in creation they're located. So if the distance between the earth and moon were doubled, the mutual force between them would change by a factor of ( 1 / 22 ) = 1/4 Each body would experience a force directed toward the other one, equal to one fourth of what the force is now.

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0The Earth exerts the greatest gravitational force on you because it is the most massive object you are closest to. The Earth exerts a force equal to your weight. The other objects exert gravitational forces but are not very noticeable because they are either low in mass or separated from you by great distance.

Newton's third law states that when a body exerts a force on another body then the second body also exerts an equally large force on the first, but in the opposite direction.In the case of the Earth and the Moon, the Earth exerts a gravitational force on the Moon of magnitude F=GMm/r2, where M is the mass of the Earth, m is the mass of the Moon, r is the distance from the Moon to the Earth and G is a constant. This force acts from the Moon towards the Earth. Likewise the Moon exerts a gravitational force on the Earth of magnitude F=GMm/r2, which is exactly the same, but this one acts from the Earth towards the Moon.So here we have two forces of equal magnitude, similar nature (both of gravitational origin) and opposite direction. Hence the reaction force of the Moon on the Earth is the force of the Earth on the Moon.

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