PAP111_Lecture16 - Clicker Time Gravitation Law says: 1 2 3...

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Unformatted text preview: Clicker Time Gravitation Law says: 1 2 3 4 6% 3% 76% 15% 1. The force is proportional to the inverse of the distance, r . 2. It is proportional to m 2 . 3. Proportional to m and r-2 . 4. Universal constant G=g. The potential energy of the gravitational field 1 2 3 4 7% 14% 3% 76% 1. is always >=0. 2. is always <=0. 3. is g m z. 4. decreases with distance from the center. PAP 111 Mechanics and Relativity Lecture 16 Einsteins Theory of Relativity Electromagnetism and Galilean Relativity Location of the Absolute Frame and Michelson-Morley Experiment The Postulates of Special Relativity Simultaneity and Time Dilatation Galilean Relativity The Principle of Galilean Relativity states that the laws of mechanics are the same in all inertial frames of reference . That is, all mechanical laws such as Newtons laws, the laws of Conservation of Energy, Conservation of Linear Momentum and Conservation of Angular Momentum, are the same in all inertial frames of reference. Important Conclusions from Galilean Relativity There is no preferred inertial frame of reference for describing the laws of mechanics. In other words, there is no way at all in determining the absolute velocity of an inertial reference frame from mechanical experiments. There is no physically definable absolute rest frame. The laws of physics deduced from experiment carried out in a vehicle moving with uniform velocity is identical to that inferred from the same experiment performed in a stationary vehicle. This agreement implies that no mechanical experiment can detect any difference between the two inertial frames. The only thing that can be detected is the relative motion of one frame with respect to the other. Newtonian Relativity Newton believes in an absolute rest frame relative to which other inertial frames move with a uniform velocity. In other words, he believes that there is an absolute frame within the set of inertial reference frames. This is the absolute inertial frame he fixed with the distant stars, and represents an absolute space in his perspective. He arrives at this hypothesis by noticing that accelerated motion appears to be absolute. Newton wrote in his Mathematical Principles of Natural Philosophy : "Absolute space, insofar as its character is concerned, has nothing to do with any of the exterior conditions: it forever maintains regularity and sameliness." Newtonian Relativity versus Galilean Relativity In Galilean relativity, none of the inertial reference frames that move uniformly relative to each other is special: there is no absolute rest frame in the set of inertial reference frames. This is the key difference between Galilean and Newtonian relativity. Maxwells Equation...
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This note was uploaded on 12/08/2010 for the course SPMS pap111 taught by Professor Claus-dieterohl during the Fall '10 term at Nanyang Technological University.

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PAP111_Lecture16 - Clicker Time Gravitation Law says: 1 2 3...

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