Equivalence principle is the fundamental idea behind general relativity Inertial mass and gravitational mass have very different definitions, one comes in Newton’s second law formula whereas another in Newton’s universal gravitational law but quantitatively they turned out to be same. Einstein then shows that qualitatively too they need to be same….after all, it is not possible to distinguish locally between a gravitational field and an acceleration #physics #specialrelativity #science #facts #einstein #generalrelativity #newton #mass
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