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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.
We also have F g = m a from Newton's second law, so a = g. The proportional constant g is called the acceleration due to gravity. On the surface of the earth g = 9.8 m/s 2 and its direction is downward. The force of gravity acting on an object is called its weight.