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AirForceOne

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If we want to find the net force on the third particle, we sum the force from the second particle on the third and the force from the first particle on the third.

Apparently, there is a force between the first and third particle. According to the book, this is due to the superposition principle, in which the first particle acts on the third as if the second particle is not there.

Flipping to the part about superposition, the book simply states that, by superposition, the net force on anyone of them will be the vector sum of the forces due to each of the others.

This explanation doesn't really help me understand how it is possible for there to be a force between the first and third particle. Can anyone explain how the superposition shows this? Thanks.