g is not a constant. It’s the measured acceleration at sea level on earth. Travel into orbit or to another planet and g will be different. The proper equation i

g is not a constant. It’s the measured acceleration at sea level on earth. Travel into orbit or to another planet and g will be different. The proper equation is: F = GmM/r^2 Where m and M are the masses of the object and earth respectively, G is Newton’s universal gravitational constant, and r is the distance between the centre of masses of the object and earth. So why is there no mass in your little g? Because the force is directly proportional to the mass of the object (holding earth’s mass constant and the distance from it constant).