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Two-body system


In the following we consider a system which consists of two point masses m1 and m2 which are in interaction with each other.
As an example, consider the Earth-Moon system. By gravitational force the Earth attracts the Moon and vice versa. The attraction force which the Moon exerts on the Earth, is, by Newton's third law, equal in size and opposite to the attraction force which the Earth exerts on the Moon.






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