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GENERAL RELATIVITY Equivalence Principle

GENERAL RELATIVITY Equivalence Principle. Equivalence principle Free Fall. Laws of Physics are same for observers in any frame of reference, including non-inertial *. General Relativity extends first postulate. *accelerating, which can be felt without reference to other frames.

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GENERAL RELATIVITY Equivalence Principle

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  1. GENERAL RELATIVITY Equivalence Principle • Equivalence principle • Free Fall

  2. Laws of Physics are same for observers in any frame of reference, including non-inertial* General Relativity extends first postulate *accelerating, which can be felt without reference to other frames Stepping stone to implement idea Principle of Equivalence

  3. Effect of acceleration = effect of gravity when stationary Small freely falling frame = local inertial reference frame General Relativity = Model of gravity Inside Aircraft freely falling dog

  4. All objects free fall with same acceleration (Galileo) Mass WHY? Inertial mass = Gravitational mass Source of gravity force Resistance to acceleration (F=ma)

  5. There is no force of gravity! • In free fall, no forces are felt • Earth’s surface is non-inertial frame Projectiles are freely moving yet follow a curved path relative to Earth’s surface: • Not due to gravity force • Due to “acceleration” of Earth’s surface

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