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Fitness Equipment & Home Gyms :: |
Simultaneity - Albert Einstein and the Theory of Relativity
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Tags: Albert EinsteinTheory of Physics Relativity Science Simultaneity
Channel: News & Politics
Uploaded: May 6, 2007 at 5:09 am
Author: MyEarbot
Length: 02:03
Rating: 4.77
Views: 255644
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.
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Video Comments
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haider87 (October 7, 2008 at 8:10 pm) |
| *This is true within our known universe.
Since our universe is expanding at an accelerating rate, then the expansion of our universe and our known space is occuring faster than the speed of light. But that does not fall as being within our universe. So you statement is true, only with an asterisk. |
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humberto1731 (October 7, 2008 at 5:24 am) |
| No object with any amount of mass can move faster or equal to speed of light and the light has always the same speed at any frame of reference.Both lights strike at the same time for the observer on earth and the observer on the train.What is different is that the lights get to the eyes of the woman one by one and get to the eyes of the man simultaneously. Thats how I see it. |
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lilmacca182 (October 6, 2008 at 5:21 am) |
| you have to remember that when your looking at a situation such as this, classical laws of physics dont apply (in this case, relative velocity)... it doesn't matter what direction the light is travelling, it always travels at c with respect to you
anyway, thats how i see it |
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lilmacca182 (October 6, 2008 at 5:00 am) |
| hmm i would have thought that it wouldnt matter whether your moving away from or towards a light source, the speed of the actual light relative to your position at any given time at any velocity would still be c, am i correct? |
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ichiromo (October 6, 2008 at 4:13 am) |
| how could the lights reach her at the same time? if she's moving speeds comparable to the speed of light, and the speed of light is constant in all frames, then the light that strikes the front of the train reaches her first because she's moving towards it.
i agree, though. this video isn't that great explaining relativity. i like spaceships much more. |
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lilmacca182 (October 5, 2008 at 10:44 am) |
| hmm i thought the speed of light is constant from all frames of reference, right?
then wouldnt it be that (from the observer in the train's point of view) the light from the front and back appear to travel towards her at equal velocities, and therefore reach her at the same time?
This is a stupid example to show the relativity of simultaneity, the thought experiment of the train with automatic doors is a better way of looking at it in my opinion... |
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lduro3 (October 3, 2008 at 6:19 pm) |
| okay waaaaaaaaaaaaaaaaat!? |
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9ior77 (October 1, 2008 at 9:48 pm) |
| I was trying to explain that with a normal train going at lets say 200km/h there would be not noticeable difference to the passenger. But if the speed was closer to the light speed, then the difference would be very noticeable. As for the 180% speed of light...I should actually say "It would seem to be traveling at 180% the speed of light" as per Einsteins theory. |
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Triple88a (September 30, 2008 at 10:42 pm) |
| no no thats what i was saying, constant speed of everything (just not with the speed of light), it just easier to understand because when you get the speeds (and scales) to what you'd see them on planet earth people seem to understand better.
Specifically on Einsteins theory, i dont believe he had this in mind, i just believe he was talking about relativity such as everything else moving around you. Get in a car, is the car moving is is the tree moving at 45mph? |
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okano186 (September 30, 2008 at 9:57 pm) |
| Special relativity? thats just common sense! |
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