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GPE relative GP huh To find GPE you need a mass, the gravitational potential energy is the energy associated with the position of a given mass in the gravitational field. To find GP you also need a test particle of rest mass to define it from. The Principle of Equivalence when it compares Earths gravity to a rocket accelerating uniformly constantly at one gravity also uses a 'test particle', aka that rocket. Without the 'test particle' there can be no descriptions of a gravitational field as you have nothing to describe the field against as it seems to me.Fields and relative motion gives me constant headaches.