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A theory that describes how matter interacts dynamically with the geometry of space and time. It was first published by Einstein in 1915 and is currently used to study the structure and evolution of the universe, as well as having practical applications like GPS.
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Why did we expect gravitational mass and inertial mass to be different?
Perhaps one starting point for thinking about the equivalence principle between gravitational mass and inertial mass is the example of an object falling towards the Earth. Here, we know from Newtonian …