Why the gravitational force (9.81) is constant ?
In physics, gravitational acceleration is the acceleration of an object caused by the force of gravity from another object. In the absence of any other forces, any object will accelerate in a gravitational field at the same rate, regardless of the mass of the object. On the surface of the Earth, all objects fall with an acceleration of somewhere between 9.78 and 9.82 m/s² depending on lattitude, with a conventional standard value of exactly 9.80665 m/s². The gravitational acceleration towards an object with mass m is given by: g = -mG/r^2 X r” where: r is the distance from center of the object to the location we are considering, r” is the unit length vector from center of the object to the location we are considering, G is the gravitational constant of the universe. Standard gravity, usually denoted by g0 or gn, is the nominal acceleration due to gravity at the Earth’s surface at sea level. By definition it is equal to exactly 9.80665 m/s2 (approx. 32.174 ft/s2).[1] This value was esta
