Question

state and illustrate the principle of superposition of gravitation force

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Answer 1

According to the principle of superposition in gravitation, net gravitational field at a point is the vector sum of the gravitational fields at that point due to different sources.

Negative mass concept is a technique used to find the gravitational field at a point (say P) easily. If a part of mass is missing from a body, then a body of same mass is assumed to be present on the opposite side of P and at the same distance as original vacancy. Now, the net field is found by calculating field due to the full body without the vacancy and the new assumed mass.