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We have a definition of ficticious or pseudo force which covers centrifugal force. I have seen it stated at times that gravity is a fictitious force. That magical changes in geometry cause gravity. Therefore I believe it is important to nail down a definition.

Quote from: jeffreyH on 20/08/2016 19:14:00 We have a definition of ficticious or pseudo force which covers centrifugal force. I have seen it stated at times that gravity is a fictitious force. That magical changes in geometry cause gravity. Therefore I believe it is important to nail down a definition. My concept of gravity is the radiated loss of mass. thus it is a physical quantity. The magical geometry I assume is the general relativity theory which may produce good numerical results but which does not give us a basic understanding of what is happening. In the washing machine spin cycle the water is squeezed out. We could say there was a force on the water perpendicular to the tub or we could say that the water moved parallel to the tub and was constrained by the surface of the tub and forced out. Two different answers. Same math involved. Which is right? I am still studying the possibilities.

Quote from: jerrygg38 on 20/08/2016 20:07:33Quote from: jeffreyH on 20/08/2016 19:14:00Firstly general relativity accurately describes the effects of gravity. Secondly, why a mass loss? First part of the sentence sounds good to me. I have no reason to dispute it. It is a mathematical analysis of the effects of gravity which is a mathematical model.The same is true of ohms laws and the various laws of electricity. They work good. However I want to understand why and how things work. The loss of mass is found fromF = d/dt (mv) = mdv/dt + V dm/dt Thus a force is either a mass times acceleration or a velocity time the loss of mass per unit time. If the mass of the universe decreases with time there is a gravitational force pushing against it. thus the mass turns into energy and the universe expands and we have gravity. To me that is an explanation of why gravity works. Einsteins work is a mathematical analysis of how gravity works.

Quote from: jeffreyH on 20/08/2016 19:14:00Firstly general relativity accurately describes the effects of gravity. Secondly, why a mass loss? First part of the sentence sounds good to me. I have no reason to dispute it. It is a mathematical analysis of the effects of gravity which is a mathematical model.The same is true of ohms laws and the various laws of electricity. They work good. However I want to understand why and how things work. The loss of mass is found fromF = d/dt (mv) = mdv/dt + V dm/dt Thus a force is either a mass times acceleration or a velocity time the loss of mass per unit time. If the mass of the universe decreases with time there is a gravitational force pushing against it. thus the mass turns into energy and the universe expands and we have gravity. To me that is an explanation of why gravity works. Einsteins work is a mathematical analysis of how gravity works.

Firstly general relativity accurately describes the effects of gravity. Secondly, why a mass loss?

There can be a change in both kinettic energy and relativistic mass. However rest mass will not change.

"If a small test mass m gains energy passing through a g-field, and the g-field is formed by the presence of mass M, then M would seem to be the source of energy."It's unlikely mass is the source of energy. What makes electrons move? Physical and light clocks stay in sync in all frames why? Light is constant why? There is a resource in space as energy that confound electrons and photons in every frame with a limit on distance of one light second length. This is measured as different lengths in different frames. Follow Relativity!!!