equivalence principle: Quick Facts

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Also Known As	null principle

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gravity freefall gravitation inertial force force inertia d’Alembert’s principle electromagnetism fundamental force wear friction strong force stress weak interaction equilibrium Can Anything Break if You Hit It Hard Enough?

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relativity: General relativity

Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.

Physics and Natural Law