thigle wrote:anyone who considers time-like and space-like dimensions as same deserves to be...
re-programmed :%
in special realtivity ?... inertial reference frame ...
thigle wrote:also, what is meant byin special realtivity ?... inertial reference frame ...
If we discard Newton's First Law, it becomes possible for a particle at rest (in a particular reference frame) to suddenly start moving, even if no force is exerted on it. This is not only counterintuitive; it violates both the Law of Conservation of Momentum and the Law of Conservation of Energy. However, this sort of thing can happen when, for instance, one is sitting in a vehicle and the driver suddenly starts the engine.
PWrong wrote:How does that violate conservation of momentum? The car moves forward fast, and the earth moves backwards very slow, because it has a larger mass. Energy is conserved because the energy of the fuel is converted to kinetic energy. And anyway, there is a force being exerted by the engine on the car.:?
thigle wrote:is will then also a violation of First law ?
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