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A difference between gravitational force and electric force is their relative strengths, related to the ratio of k to G. The electrostatic force between an electron and a proton is many orders of magnitude greater than the gravitational force between them. electrostatic When using the "+" and "-" signs in the calculation of force, the result will be that a "-" value for force is a sign of an attractive force and a "+" value for force signifies a repulsive force.Gravitational forces can also be repulsive like that of electrostatic forces.
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