Simultaneity - Albert Einstein and the Theory of Relativity

Video Title :	Simultaneity - Albert Einstein and the Theory of Relativity
Description :	Imagine two observers, one seated in the center of a speeding train car, and another standing on the platform as the train races by. As the center of the car passes the observer on the platform, he sees two bolts of lightning strike the car - one on the front, and one on the rear. The flashes of light from each strike reach him at the same time, so he concludes that the bolts were simultaneous, since he knows that the light from both strikes traveled the same distance at the same speed, the speed of light. He also predicts that his friend on the train will notice the front strike before the rear strike, because from her perspective on the platform the train is moving to meet the flash from the front, and moving away from the flash from the rear. But what does the passenger see? As her friend on the platform predicted, the passenger does notice the flash from the front before the flash from the rear. But her conclusion is very different. As Einstein showed, the speed of the flashes as measured in the reference frame of the train must also be the speed of light. So, because each light pulse travels the same distance from each end of the train to the passenger, and because both pulses must move at the same speed, he can only conclude one thing: if he sees the front strike first, it actually happened first. Whose interpretation is correct - the observer on the platform, who claims that the strikes happened simultaneously, or the observer on the train, who claims that the front strike happened before the rear strike? Einstein tells us that both are correct, within their own frame of reference. This is a fundamental result of special relativity: From different reference frames, there can never be agreement on the simultaneity of events.
Views :	207002
Rating :	4.76
Keywords, Tags :	Science Physics Simultaneity Albert EinsteinTheory of Relativity
Video Length :	2 : 2

Comments :

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Regarding the "two boxes" thought experiment. It's not true that you can't tell the difference. If the boxes are wide enough, you can tell if you are stationary on the earth's surface or accelerating through space, because if you are on earth, two weights, dropped at each end of the box, will move downward in diagonal lines toward the center of the earth. But in a spatially accelerating box, they will fall downward in straight lines.

Neithax, of course you are right. This is implied by Newton's first law of motion: "Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon." A state of rest AND uniform motion in a right line (without acceleration) is basically the same condition, i.e. with no accelerative forces being experienced. Much of what Einstein said was already known for hundreds of years.

Einstiens view of 2 forces that are equal to each other and thus one is not or does not over power the other but are congruent and parellel and structured as one force that is in existince.

Galileo and Newton told us that we cannot tell if an object is moving or at rest unless it is accelerating.

Einstiens had a thought experiment where there were two boxes. on on earth and one in deep space (no effects due to gravity). the one in space was accelerating at G (9.81... m/s^2)and he proposed there were no experiments to determine which one you were in. confirming that u cannot tell wether you are truly "stationary" or "accelerating" although both are accelerating in their own respect.

This is not for the average youtuber. lol

im fuckin stoned man , wtf he talking about ???????

man that would mean we dont see what happens right now when we look out the back of the train, but we see what JUST happened in the past...

The thought experiment says the train is moving left to right on the railroad track. Everyone knows what a "moving train" means. In the thought experiment the two lightening strikes hit the embankment simultaneously. They do not strike the front and rear of the train. The animation does not follow the actual thought experiment. The train should not stop while the stationary observer observes the flashes, and the flashes should not move from left to right with the train.