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Physics
OpenStudy (anonymous):

Hey guys, i would like to know why gravity is considered a force when really it is the product of mass within spacetime. To me it seems that without matter, gravity would not exist. So gravity is more so an effect. Can the same be said for electro-magnetism. and the "nuclear forces"? I believe that without matter none of these forces or effects would exist. but it leads me to wonder that if E=mc2 then Energy should display the same effects by a factor of much less than condensed matter. So is it possible that energy can display gravitational properties?

OpenStudy (agreene):

Probably the easiest way to explain this is that F=ma the acceleration from gravity is constant and therefore operates like a force (locally).

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