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?
Lv 4
? asked in Science & MathematicsPhysics · 10 years ago

Why does time slow down "literally" for someone who moves at a high speed?

If both the traveller and observer would experience their own time as 'normal', why would the traveller's time be slower compared to the observer, should the traveller whisk off in a spaceship at 99% the speed of light?

I can understand why you'd 'see them move slower', due to the speed of light having a constant speed in all reference frames, but why the ACTUAL time laps?

From the traveller's perspective, the Earth would be moving away from him at 99% speed of light, so why does he not experience more time than the Earth, as opposed to him experiencing less time?

Why does the act of acceleration, which is all that I can think of as being different from the observer and the traveller, cause an actual difference in time experienced?

9 Answers

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  • ?
    Lv 5
    10 years ago
    Favorite Answer

    i wont make it complex in simple words we can say that

    ''time slows itself down to avoid violation of laws of nature [law that nothing can achieve the speed of light]''-STEPHEN HAWKINGS

    Source(s): LP
  • Anonymous
    10 years ago

    There is a time lapse between the two observers due to the fact that an object travelling at relativistic speeds experiences time dilation. The example with a light clock may help you understand this better. Just google "light clock".

    If both of them were moving at a constant velocity, then each of them would experience more time than the other. This means that if there were two twins, one on earth, one in a rocket travelling away at a constant velocity, both of them would be older than each other at the same time. What would happen when the twin arrives back on earth? Hence the twin paradox arises. This is a problem that special relativity can not solve.

    In reality however, the twin that went on the journey would be younger than the twin that stays on earth. This is expressed in general relativity. The act of accelerating to return to earth applies another relativistic effect on the twin that is on the rocket. If the acceleration is large enough such that the earth's own gravitational acceleration is negligible, this effect would be observed. Acceleration causes another relativistic effect similar to the one on velocity. The greater the acceleration, the slower time passes for the person experiencing the acceleration.

    Hope this helps. General relativity is extremely difficult to understand. Final year students in university have trouble understanding it.

    Source(s): PhD in physics.
  • ?
    Lv 4
    10 years ago

    Firstly, time does not slows down.

    It was the clock that slows down.

    The idea of 'time' is that it is vary on different people depending on the gravitational field you are in and your velocity.

    Light travels at a constant rate, imagine you have a box, with a light beam in it, bouncing up and down.

    One tick is equivalent to a second in our practical world. But because light travels at a constant rate, when you accelerate and reach 0.99c, as the distance increase, and as the speed of light is always constant, the light beam took a longer 'time' to have one revolution as the distant increases.

    Or try to imagine you are in a train that has a velocity of 0.99c, so if you run in the train. Your speed relative to a person standing still outside of the train will be 0.99c + your speed. And if it happens that your speed is fast enought to achieve 0.011c, then that will violate the universal speed limit of light of speed.

    So again, the clock in the train slows down, to prevent anyobject from acceeding the speed of light. Which also means that if you are running at 0.11c in a 0.99c train, your clock will be again, slower relative to the rest on the train, and the time is just nice that you wont break the universal speed limit.

    There is a mis-conception with your question, because after all it is the traveller who is moving away at 0.99c. Based on your idea, if Person A jogs away from person B at 20km/h, i can say the displacement between Person A and B is accelerating at 20km/h, but i cant say person B is moving away from person A at 20/km.

    Why?

    Because if B is moving at 20k/h, B's rate of calories burnt is equivalent to that speed, but the calories burnt is not that high, but calories burnt for person A is that high.

    So afterall, i cant say person B is moving away from A, but A is moving away from B. The same principle applies to the earth and the traveller.

  • 4 years ago

    this would properly be a great question. From what I even have examine the guy who's shifting at close to easy velocity notices no diffefence interior the way his clock works, it appears that evidently to be ticking regularly. this might lead one to think of that besides the shown fact that a hundred years has exceeded for a sluggish shifting induvidual, the spaceman would desire to get only as lots artwork performed, yet easily the spaceman is doing each little thing at a slower value, for this reason his clock looks be ok. If time slows down, so does everyting else touching directly to activities, so the respond ought to be, no.

  • Anonymous
    10 years ago

    It's true that time is affected by gravity. Barren space will have less gravity than Earth and thus be less ravaged by the effects of time. The greater the speed of an object also the lesser the effects of gravity will influence than object and hence the lesser the effects of time will ravage it.

    Time is not finite like most will imagine, it is different in different situations, however only by applying true extremes can begin to perceive these differences.

  • 10 years ago

    In my opinion,,, 'Space / Time' moves by at a different rate for two people moving at different speeds, because space becomes 'contracted', i.e. A person moving at normal speed exist in normal space, the clock runs normally, but in contracted space, at near light speed, the 'Space' has 'shrunk' (contracted) and therefore 'Time' has 'shrunk' (contracted) down in size; as well,,,,,,

    In a car accident, time slows down due to the compression and shrinking of space /time,,, in much the same way time would slow down when accellerating to the speed of light...

    Source(s): Uni studies, Relativity books, science documentarys, some idea's theory's..
  • 10 years ago

    Asking "why" something in physics occurs is pretty futile. Physics is the task of developing theories that characterize the world we observe, and the items you mention are indeed observable. Einstein developed special relativity to put equations and numbers to those observations. But he didn't even attempt to explain the why.

  • Anonymous
    10 years ago

    woww guys, thats a really intresting question, n also answers, i didnt totally get the question. even if i had totally understood the question, i think thats out of my knowledge. well but here is something to think about, i read it somewhere... stephen Hawkins also said an universe can form and exist from nthingness, a void. and space time and matter are created. and now there appears to be other dimensions as explained by string theory n so on.

    ok my point is, time, i think it doesnt really exist, because of change in things and sorroundings and society and blahh blahh around us we believe that it exists but i think it really is a hoax. but that is just plain dumb idea of mine.

    also i recently wrote a paper on atom, if u break down an atom it is no more as simple as we ve been explained. i just wanted to write something as i found it really intresting

    anyways thanks

    Source(s): i changed my major from physics to computer so no source
  • 10 years ago

    T=tγ^-1

    T=time for particle

    t=time for us

    γ=1/(1-v²/c²)^½ lorentz factor

    at high speed γ>1 so γ^-1<1

    (t/γ)<t

    so

    T<t

    Source(s): my studies
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