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The property of an object that determines how much it responds to a force in Newtonian mechanics, and how much it interacts with gravity in the Newtonian framework. Mass also refers to the intrinsic energy of a particle in particle physics. This tag does also cover effective mass.

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Theoretical Possibility of "Opposite" Gravitational Mass? [duplicate]

Could there be two types of gravitational mass? Let's call them Д - mass and Ξ - mass. … Д - mass is the type of mass that we're all made out of, our bodies, our planets, our solar system. Ξ - mass would be the"opposite" type of mass. …
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