Newton considered whether the same force that causes the apple to fall could also be responsible for the moon’s orbit around the Earth.
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The fall of an apple from a tree, which reportedly hit him, inspired Isaac Newton to think about gravitational force.
Gravitational force causes an object dropped from a height to fall towards the Earth.
There must be a gravitational force acting on the moon and the planets for them to maintain their orbits around the Earth and the Sun, respectively.
Isaac Newton recognized that the same gravitational force is responsible for objects falling to the Earth, the motion of planets around the Sun, and the moon orbiting the Earth.