Rankers Physics
Topic: Gravitation
Subtopic: Newton's Law of Gravitation

Earth exerts a gravitational force on the Moon, keeping it in its orbit. The reaction to this force, in the sense of Newton’s third law, is:
the centripetal force on the Moon
the nearly circular orbit of the Moon
the gravitational force on Earth by the Moon
the tides due to the Moon

Solution:

According to Newton’s third law, for every action, there is an equal and opposite reaction. The Earth exerts a gravitational force on the Moon, and the Moon exerts an equal and opposite gravitational force on the Earth. This reaction force is the gravitational force on Earth by the Moon.

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