Newton conjectured that the same type of force, gravitational force, is responsible for attracting both the apple towards the Earth and the moon towards the Earth.
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Newton considered whether the same force that causes the apple to fall could also be responsible for the moon’s orbit around the Earth.
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.