PHYS 1003 Lecture 8: Lecture 8

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Gravitational force between two objects is small unless the mass of one object is very large in comparison to earth. For objects less than 160km from the surface of the earth. Einstein"s general theory of relativity tested in 1919. Instead if describing gravity s a force which originates from matter, he describes space-time as being distorted by the presence of matter. Objects continue to move long the gridline, but now the gridlines. Light can be bent by the effects of space-time curvature. A scalar property of an object/s (state or condition of object/s) Many times of energy which can be converted from one to another. Principle of energy conservation: the total energy of the universe in a constant. Interactions are modelled by exchanges of energy or by conversion of energy to another. Potential energy-energy due to interaction with a field (attraction or repulsion) Rest energy intrinsic energy of a particle.

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