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The gravitational constant, approximately 6989667400000000000â 6.674Ã10â11 Nâm2/kg2 and denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies.
It is the force that allows satellites, including natural ones like the moon, to stay in orbit around the Earth, and the Earth to stay in orbit around the sun. The most basic equation for force is: force equals the mass of an object multiplied by its acceleration. To calculate the force of Earth's gravitational field, acceleration is substituted with the measured acceleration of gravity, which is 9.81 meters per second squared.