Time Dilation - Einstein's Theory Of Relativity Explained!
Video Overview & Insights
What is time dilation? In this video, we explain Einstein's theory of relativity and how time dilation works in simple words with animation. Learn how time slows down at high speeds, the difference between special and general relativity, and why spacetime bends near massive objects.
If you could travel at 99% the speed of light, where would you go first? Also, check out our video on Spacetime Explained if you want to dive deeper! https://youtu.be/3khY_bwf5FY
Whether you're a student, a physics enthusiast, or just curious about how the universe works, this beginner-friendly animated explainer will help you understand one of the most mind-bending concepts in modern physics.
CHAPTERS:
Einstein didnât calculate cell time or biological time. Your body doesnât care and will age at the same rate regardless of what each clock says. đĽ your welcome
0:00 - Einstein's tram car thought experiment
1:07 - Newton vs Maxwell: The speed of light problem
I feel like an easier understanding too is this way of thinking about it. If you are on a train and look at a clock that is the opposite direction of where that train is going to move. At rest you observe the clock and see the hands move at a normal rate. You then accelerate still looking at the clock and the clock appears to move slower.
When you are at rest the clock gives off light and it is hitting you, but as you accelerate that light has to travel that space youâve created. Now letâs say the train can accelerate to the speed of light and you still observe this clock, youâre now moving at the speed of
Light and the clock stops, this is because youâre moving at the same rate away from the light as itâs coming.
Itâs very similar if not exactly what he said just easier to digest personally
2:35 - The lightning bolt thought experiment
3:57 - What is time dilation? (Special relativity)
This all still proves nothing for time... all you are explaining is that the wave function for photons accelerated and decelerates to keep it's speed constant. Photonic frequency is not static, just the velocity.
4:16 - Spacetime: The four-dimensional fabric
4:37 - How gravity curves spacetime
Ůذب بŮذب
5:39 - Gravitational time dilation explained
6:19 - The photon clock thought experiment
"Who do you love the most?Newton or Maxwell?"
Einstein - "both"
"How?"
7:43 - Time dilation affects everything (even you!)
WATCH NEXT:
As velocity is not absolute in space-time, time is also not absolute in space-time. You should always say the time with respect to something. It is wrong to say that time stops if we move at the speed of light. Time never stops. Just like you won't feel the motion when you are on the train because your body has the same acceleration, your time will stop if you only refer to yourself, and not measure time compared to something.
Foton speed is fixed because it is the maximum speed that space-time particles allow photons to have. The speed of light is the maximum speed at which a photon can displace a space-time particle to move through space-time.
âś What Exactly is Spacetime? â https://youtu.be/3khY_bwf5FY
âś Quantum Mechanics Explained in Simple Words â https://youtu.be/p9pPjASnnxw
Does Time create Distance or Distance create Time? I think the expression of "Slower Time" is very misleading. I would phrase it as "Less Time Used". Tht would really help convey the idea much better but I could be wrong.
KEY TOPICS COVERED:
⢠What is time dilation and how does it work
Last example is wrong!!! Gravitation makes time near the surface of the earth slowed down (gravitational time dilation). This effect is stronger than time diliation through high velocities, so the person on the mountain actually gets older faster.
⢠Einstein's special theory of relativity explained
⢠General relativity vs special relativity
I used to look at the school clock in the classroom - I can confirm that time did, indeed, stand still
⢠How GPS satellites account for time dilation
⢠The twin paradox and interstellar time dilation
I'm here to know how time works and now I'm leaving not knowing what time actually is
⢠Why time moves slower near massive objects
⢠Spacetime and how gravity warps it
Im sorry i still dont think its real.not being able to see the clock hands move doesnt mean youre not aging.
#TimeDilation #TheoryOfRelativity #Einstein #SpecialRelativity #Spacetime #Physics
REFERENCES:
7:12 Brian Cox has an amazing video that shows this live. A guy is moving a glowing ball up and down while sitting on a rolling chair. They turn the lights off in the studio and show how the ball moves in a triangle to the viewer, but to the guy in the chair, itâs just moving up and down.
https://faraday.physics.utoronto.ca/PVB/Harrison/GenRel/TimeDilation.html
http://newt.phys.unsw.edu.au/einsteinlight/jw/module4_time_dilation.htm
"At the speed of light" holy gd ref
https://web.pa.msu.edu/courses/2000fall/PHY232/lectures/relativity/dilation.html
Original Article: https://www.scienceabc.com/nature/universe/time-dilation-why-does-gravity-slow-down-the-flow-of-time.html
Im dumb
Voice Over: John Staughton (https://www.fiverr.com/jswildwood)
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This seems odd to me. Isn't light just a faster medium than sound. Why is light tied to time, and not sound? If someone says hello to me, and I move away at the speed of sound I won't hear it. If I stop two seconds later, I will immediately hear it. What changed, 2 seconds and my position. Do the same with light. Someone turns on a torch, and I move away at the speed of light, I won't see it. But I stop 2 seconds later, and I will immediately see the event. What changed, 2 seconds and my position. In both cases it will now take 2 seconds for me to hear or see a recurrence of those events. What if I could watch a clock on each of two planets spaced 2 light seconds apart and equidistant from me, then I watch a clock leave one planet at the speed of light and arrive at the other in 2 seconds. In the end, the only changes observed by me in all those clocks will be the elapsed 2 seconds. Yes, there would be some distortion of my vision of the clock enroute as the distance from me would not be fixed, but that would null out. Again, what actually changed, 2 seconds and the position. So yes, Einstein's clock would have appeared as though it slowed, but in reality, it didn't. There is no enroute clock change because time was irrelevant, it's just that now, the traveler will not see changes from the origin for 2 seconds.
More User Perspectives
At the centre of earth's inner core, inside the solid iron sphere, isn't gravity zero? and wouldn't that make Newton and Einstein right separately? Every time when a spacetime fabric is illustrated, we are shown that it bends more at the inner core, but it shouldn't be illustrated that way because gravity is zero at the inner core however, time dilation does become grater at the inner core. Wouldn't that mean gravity is still a pulling force and Einstein is only responsible for the discovery of Time Dilation?
@HomeTest-j3hWhy is it always 99% and not the speed of light? Also how did Einstein think that clock would appear to not be moving in the first place?
@adamnelson1839Wrong! Space is not distorted by mass but rather, time is distorted by mass. Space doesnât exist
@Epicfunk102If time dilation exists then why heart beat and pulse rate
@Aashking-e6bThis video somehow confused me more lol
@laurarojas3166Wouldn't the cells in your body still age regardless of your velocity?
@MegaCharlie11I have the basic hang of this already as I've studied it, but I find these cartoons too patronizing and "dumbed down" to withstand. I just want the science. Sorry
@DeborahEdelen333So, if the universe is continuously expanding at the speed of light. The objects close to the middle should be unimaginably old.
@k67h-q6vEverything was so confusing until the photon clock. It all makes sense now. đŽâđ¨
@flamingturkey7727Okay, i am here because i watched for the 100th time the interstellar and asked my chatgpt about this and still i canât understand đđđ
@shieldsjred2439So with this theory my body will age equally if Iâm laying down all the time?
Alright, Cool,Thanks
I don't feel learned very much. Just have to keep searching.
@liMe-leMonIâm here because of a police body cam talking to a guy who breached into Area 51 twice talking about time dilation and DĂŠjĂ vu
@RyanThaLion1There are 2 ships passing each other.
Ship1 at rest at top.
10;00 10;00
T--------------------N
<--- N----------T
10;00 10;02
Ship2 at rest at bottom.
10;00 09;58
T----------N --->
N--------------------T
10;00 10;00
Are the 2 ships passing each other once or twice?
T1 passes N2 twice. T1 passes N2 when the clock at N1 reads 9;58. T1 passes N2 again when the clock at N1 reads 10;00. If T1 meets N2 once then what is the time displayed at N1 when this happens?
There are 3 lights that are the points of a triangle. A, B, and C are lights and are stationary with respect to each other. S1, S2, S3 are spaceships. S1 is moving from B towards A. S2 is moving from C towards B. S3 is moving from A towards C. A, B, and C flash simultaneously in the frame of reference that is at rest relative to these lights. So in the frame of reference of S1, A flashes first followed by B flashing. In the frame of reference of S2, B flashes first followed by C flashing. In the frame of reference of S3, C flashes first followed by A flashing. So the sequence of flashing is A, B, C, A. But wait! A flashed first. How can it flash last? How can A flash both first and last?
@vesuvandoppelgangerThis is the moment when T1 is lined up with N2.
Ship1 at rest at top:
1 light-year
T--------------------N
N-----------T <-----.8c
.6 light-year
Ship2 at rest at bottom:
.6 light-year
T----------N -------> .8c
N--------------------T
1 light-year
The spaceships are each 1 light-year long and are passing each other at .8c. So each ship is contracted to .6 light-year when viewed from the other ship.
T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
"In May and November, the Earth is moving at "right angles" to the line to Algol. During this time we see minima happening regularly at their 2.867321 day intervals. However, during August, the Earth is rapidly moving towards Algol at about 107,229 km/hr as explained on my How Fast Are We Moving? page. (The Earth moves approximately 202 times its own size in one day.) So in 2.867321 days the Earth moves about 7,379,039 km closer to Algol. But the varying light from Algol doesn't know this - its light waves left Algol 93 years ago and are travelling at a constant speed. The result - we "catch a bunch of minima early" during August as shown on Chart 2. Exactly the opposite happens during February - the Earth is moving away from Algol that fast and it takes longer for the group of minima to reach us so we see them taking longer between events. How long? 7,379,039 km divided by the speed of light 299,792.458 km/sec is 24.61382 seconds. So in May and November when we are not moving towards or away from Algol - the period seems constant. It is our rapid movement towards or away from the events in August and February that causes the timing differences."
In February the earth is moving away from Algol and the time between the eclipses is 2.8675875347 days and the light is passing the earth at 186,265 mi/sec.
In May and November the earth is not moving towards or away from Algol and the time between eclipses is 2.867321 days and the light is passing the earth at 186,282 mi/sec.
In August the earth is moving towards Algol and the time between eclipses is 2.8670608912 days and the light is passing the earth at 186,299 mi/sec.
Rocky fix my â¤.
@AK-ic1yjSo with the clock tower point, Is time actually slowing down? Or are you moving so fast away from it, youâre outpacing the light from that object to hit your eyes? So the clock may look âfrozenâ. I donât know this stuff hurts my head. Itâs like planets and space, if something is 450 light years away, what youâre seeing is 450 year old âlightâ or images from it, on the flip side, wouldnât a high power telescope that can zoom practically to interstellar space then get the light further away? Like moving your eyes closer to the item? But somehow I guess is still stays forever at that set mark no matter how much zoom you get going on it.
@53aN83Wrong. Time is not a physical construct that can be manipulated by other forces. The whole premise of relativity theory is false.
@savedbyjesusbloodOnly thing einstein did wrong was he shouldn't have taken a tum taken by our atmosphere
@zocomofraklin4671:44 Bangkok BTS trains đ
@TheKamrenBIf he's moving away from the clocktower at the speed of light (and can somehow see the clock's face the whole time) it would SPEED UP incredibly, whereas his own pocket watch would still go at the same rate, meaning that time moves slower for him due to his higher speed. So essentially, he'd see the exact opposite of what you describe, no?
@tomik524This is what I need at 1:46 am.
@YaadMovesMy brain is working hard⌠but I still do not understand đđ
@afangirlaholicJust a thought, but... what if space isnât the only thing expanding? What if time itself has been expanding slightly and constantly since the Big Bang? What if earlier seconds were shorter than todayâs, making earlyâuniverse events like inflation, recombination, and don't structure formation line up more cleanly with the physics we observe? How would we know? What if quantum fluctuations, decoherence rates, and even the apparent acceleration of the universe all make more sense once both space and time are stretching together? Wouldn't this dual expansion help bridge the longâstanding mismatch between quantum mechanicsâ fixed time and general relativityâs dynamic spacetime? Of course, the objections matter. General relativityâs lack of a timeâexpansion term, and the absence of measurable drift in atomic clocks, etc, and the possibility that this is just a coordinate choice and are real constraints. But even then, doesn't treating time as expanding alongside space still offer a surprisingly coherent way to rethink some of cosmologyâs biggest puzzles? Just a thought.
@Uncommon_Cents71Here for curiosity, not cz school wants me to be
@shreykaushik1080Just because one perceives the nearest lightning strike as happening first due to his relative proximity, they still happened at the same time.
@chrismosher3297Wait so are getting closer to the sun?
@ahmedjalal7579Iâm sure Iâm misunderstanding something but it seems like this is just relative to the observer. For instance in the clock example, the clock is not actually stopped, it only appears that way because the observer in the tramcar is moving away from it at the speed of light. Time itself is still moving at the same speed for both the tramcar and the clock, itâs just a perspective thing. If a firework explodes and it takes a couple seconds for you to hear the explosion, you would know that it was just an illusion created by distance from the firework and that in reality the explosion had already happened. Can anyone clear this up??
@Jon-vj5dn