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Gravity and inertia are not the same.
Can gravitation and inertia be identical? This question leads directly to the General Theory of Relativity. Is it not possible for me to regard the earth as free from rotation, if I conceive of the centrifugal force, which acts on all bodies at rest relatively to the earth, as being a "real" gravitational field of gravitation, or part of such a field? If this idea can be carried out, then we shall have proved in very truth the identity of gravitation and inertia. For the same property which is regarded as inertia from the point of view of a system not taking part of the rotation can be interpreted as gravitation when considered with respect to a system that shares this rotation. According to Newton, this interpretation is impossible, because in Newton's theory there is no "real" field of the "Coriolis-field" type. But perhaps Newton's law of field could be replaced by another that fits in with the field which holds with respect to a "rotating" system of co-ordinates? My conviction of the identity of inertial and gravitational mass aroused within me the feeling of absolute confidence in the correctness of this interpretation.
Correct me if I am wrong but is it not momentum the dart possesses? rather than inertia. I thought inertia was the force required to move a body whilst momentum is the energy that a moving body possesses? What I was imagining was a body held at rest by the force of gravity. Mass is all around, near and far. When a body is at rest the gravitational forces must be in balance? Like a ball held by elastic cords, where each cord is stretched by a different amount but where all the cords tension balances out. When a force acts on the body it has first to overcome all the gravity that opposes the direction of movement before the body can move.
Correct me if I am wrong but is it not momentum the dart possesses? rather than inertia.