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The gravitational interaction or potential energy of two objects with masses m and M and separation r is The negative sign tells us that the interaction is attractive Note that with this equation the potential energy is defined to be zero when r = infinity What matters is the change in gravitational potential energy For smallGravitational potential energy = mass ×We will use the symbol ∆ to mean the change in So, we will use the equation to find ∆U, the change in gravitational potential energy ∆U = U final U initial Take out common factors ∆U = N∙m ∆U = J The change in gravitational potential energy as the asteroids move away from each other is Joules Gravitational Potential Energy Images Stock Photos Vectors Shutterstock Change in gravitational potential energy equation triangle