love_444 (Mariana V.I.P): It involved a fundamental new connection between space and time and that Newton’s laws are only an approximation. *
26-12-07 - 22:09:47

love_444 (Mariana V.I.P): With the belief that Maxwell’s equations must be valid in all inertial frames, Einstein proposed the following postulates: The principle of relativity: All the laws of physics (not just the laws of motion) are the same in all inertial systems. There is no way to detect absolute motion, and no preferred inertial system exists. The constancy of the speed of light: Observers in all inertial systems measure the same value for the speed of light in a vacuum. *
26-12-07 - 22:14:30

love_444 (Mariana V.I.P): The constancy of the speed of light :- Consider the fixed system K and the moving system K’. At t = 0, the origins and axes of both systems are coincident with system K’ moving to the right along the x axis. A flashbulb goes off at both origins when t = 0. According to postulate 2, the speed of light will be c in both systems and the wavefronts observed in both systems must be spherical. *
26-12-07 - 22:18:34

love_444 (Mariana V.I.P): Re-evaluation of Time! :- In Newtonian physics, we previously assumed that t’ = t. With synchronized clocks, events in K and K’ can be considered simultaneous. Einstein realized that each system must have its own observers with their own synchronized clocks and meter sticks. Events considered simultaneous in K may not be in K’. Also, time may pass more slowly in some systems than in others *
26-12-07 - 22:27:02

love_444 (Mariana V.I.P): Time Dilation :-The time interval of an event measured by a stationary observer is more than the interval of that event measured by a moving observer. Time Interval = ending time - starting time of the event . A clock moving with relativistic speed relative to a stationary observer appears to go slow “Time Dilation” *
26-12-07 - 22:34:09