Theory of relativity explained in 7 mins

Hi everyone, today we explain Einstein's famous theory of relativity! Enjoy ;)
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TIME STAMPS
Part 1: Classical relativity - 0:11
Part 2: Special theory of relativity - time dilation - 1:26
Part 3: Special theory of relativity - length contraction - 3:37
Part 4: Time travel - 4:50
Part 5: General theory of relativity - 5:33
Part 6: How do we know it's true? - 6:18
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Theory of relativity for dummies
Theory of relativity made simple
Theory of relativity simplified
Time dilation explained
Length contraction explained
Is time travel possible?
Can we travel faster than the speed of light?
How does GPS work?
Classical relativity explained
Classical relativity for dummies
Classical relativity made simple
Special theory of relativity for dummies
Special theory of relativity for explained
Special theory of relativity made simple
General theory of relativity for dummies
General theory of relativity for explained
General theory of relativity made simple
Albert Einstein's theory of relativity explained
Albert Einstein's general theory of relativity explained

[@raymondxdxp]

Why am I watching this in the middle of the night when I am a law student and have three essays to write

[@LondonCityGirl]

I can relate - I studies law at Uni and I used to everything to avoid writing those essays! :D

[@Darker_Void_Scientist]

LondonCityGirl Isn't it strange that time, distance, and speed seem to be a variant of a single structure ? You need speed x time for distance, distance and time for speed, and speed and distance for time. They look like a never ending loop. The principles stated in the video seem to take effect at every step of this infinite loop stuff. Distance, time, and speed seem to be motivated by something. I think it's energy. I think momentum/vibration = energy, time,distance,and speed. I think matter is just some variant of this momentum. What do you think?

[@latouselatrec]

Tsang Raymond because ........you have 3 essays to write

[@everythingaboutcelebs5091]

Yeah u r right everything in this video can be understood easily if u understand the equation speed=distance/time. Vibration and energy is inversely proportional to each other???

[@elishalandu1846]

Lolololololol

[@highcheese]

Einstein is always shown as an old man, but it's interesting to note he was a very young man when he published these theories.

[@steve5825]

highcheese he was a ‘relatively’ young man! 😄

[@theultimatereductionist7592]

There exist pictures of him young.

[@markperry3517]

Plagerized them

[@jasonjamrs7413]

His messy hair is a trademark don't knock the people who can't understand basic maths

[@richardverney6702]

@@markperry3517 Not so. It is inevitable that later scientists stand on the shoulders of giants. It is a bit like a jigsaw, some were putting 2 or 3 pieces together here and there, but it was Einstein who assembled all the pices and put them all together, into one coherent whole.

[@LaLumiereLaLumiere]

Teacher: you're 15 minutes late to the class Me: well, time is relative.

[@legendslog3911]

Underrated comment!!

[@mangobaby_videos]

UNDERRATED! VERY GOOD!!!!!!!!

[@ianbynoe6515]

Noor yeadeen, you are very funny, lol.

[@khoxkhox2290]

Yes time is relative, but it is always relative to something, in this case relative to the school working hours.

[@pot_kivach160]

Noor Yaseen // really? Your girlfriend: you’re 15 min late?! You: blame einstein. She: sure, sure I gonna do it right now. Bye!

[@akshat680]

When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute - and it's longer than any hour. That's relativity.” - Albert Einstein

[@averagedbeatenjoyer]

No? It's not

[@user-fm5hw4jt4j]

@@averagedbeatenjoyer You won't understand it..so forget it

[@AerobaticsPilot]

It's so above your head time is relative like time flies when having fun its over all ready damn it but do something you Hate and time stands still like the HOT CHICK you don't want rhe time to go but a hot stove even a spit second hand on stove is too long a time to pass smh

[@Icespicewithmylittleeye]

O

[@grapiken7766]

This is perfect. No gimmicks, no background music. Just clear simple information. It still takes mental gymnastics getting your head around it all. Thanks for the great video.

[@LondonCityGirl]

Gra Piken thanks so much for the great feedback! :)

[@khansaib6370]

LondonCityGirl i love u. after seen this video, lol

[@keylargo7647]

I still don't get it

[@user-ks1hx8qi7c]

Theory of relativity is not hard to understand but hard to believe!

[@sugyanidash2810]

Absolutely right

[@qqn4531]

This video isn't hard to unerstand because it's very simplified but I can assure you that understanding the whole theory of general relativity is hard. That's why I came to this video but the girl said things that I already knew

[@mohammedhamza5528]

Yes

[@mauriciorosales1259]

Ironically the equations for special relativity, if I recall, were very straightforward and easy to work with.

[@tomscott3]

the math is easy, the concept is difficult. i always tell my students to not let their brains get in the way of them understanding it...

[@DoctorGlitch]

I can’t Believe I’ve been browsing videos for the past 7 days and i think i finally understand now. Thank you so much

[@aahana6084]

@DOCTOR GLITCH kzbin.info/www/bejne/rHjLiqqHmdWAZ7c Comperhensive Ppt about black whole in Urdu language

[@life4free965]

What really? So do i have to replay this video over and over?

[@iangehrlich-orr1869]

I just want some thoughts. This says that time must slow down if the light is travelling a greater distance, but isnt the time it would take for it to travel that distance just be longer even in reference to the other one. Basically, for the light to bounce back and forth three times while the mirrors are moving, it would take lo ger than while they are still because it has a greater distance to travel

[@frankharcourt7523]

Ha! Have you ever heard of the concept of the fruit loop? It goes like this - true statement - true statement - true statement - false statement + fruit loop. A fruit loop is a false statement that spins the argument down and impossible path and then spins out of control... Called a fruit loop because it is crazy ie "fruity" and loops back on itself and then spins off in some incredible and impossible direction. That is what you have here. Einstein the "Greatest Genius of the Twentieth Century" was in fact the greatest proponent of the "Fruit Loop" in history. Einstein has no idea what time is or even what space is. His "theory" is so flawed and so beyond the realm on possibility it is worthless except for those parts of the theory that he "borrowed" from much smarter men than him. Einstein will without doubt eventually go down in history as the greatest "scientific" con man who ever lived.

[@iangehrlich-orr1869]

@@frankharcourt7523 so your agreeing with me that it does not make sense?

[@thefactual183]

0:10 -Classical Relativity 1:25 -Time Dialation 3:33 -Length Contraction 4:45 -Time Travel 5:29 -General Theory of Relativity 6:14 -How do you know it's true Hope it helped you a lot

[@ROCKTHERAICHU]

Thanks

[@thefactual183]

@@ROCKTHERAICHU Wlcm Dude

[@N3_r]

Cool

[@aryanhs9123]

Bruh look at the description

[@onetruekeeper]

The above four mentioned are all unproven nonsense.

[@lagj49]

The clear explanations, combined with extremely pleasant voice and diction, makes this video a pleasure to listen to.

[@ixmix]

Jacques Lagacé but hard to understand

[@rutee4614]

This explains why when I'm standing still or procrastinating time seems to get away from me, but when I'm moving I feel like I have plenty of time.

[@Vinodgupta-gc7xg]

Wow... Great comparison

[@matttnathan]

Alyson Oltmann not really. The total difference in time would be less than a second.

[@philipnorris6542]

I think that's a bit of an oversimplification, Alyson, but you're probably not too far off the mark.

[@georgebetancourt7681]

Holy shit your right! This happens to me every morning

[@partharai6784]

Actually good explanation..

[@khanumersalim2619]

I have watched many many videos but I was unable to understand,but literally literally this video helps me to understand about theory of relativity ,the speaker explains in such an easy way that it was easy , very easy to understand . Thanks a lot to the speaker.

[@SCP--sf3fu]

That Speed = Ddistance/Time demonstration was SOOO HELPFUL! I've always been told the time is relative but no one's ever fully explained it. Thank you for this video!

[@isharawat4474]

It’s 2:34am and I have my finals tomorrow morning but look at what I’m watching. I’m a fashion student but DAMN IS PHYSICS ADDICTIVE OR WHAT

[@LondonCityGirl]

Good luck with your finals! :)

[@gauravshinglot777]

Ikr 🤦🏻‍♂️ it actually is addictive. I'm a CA student and I'm watching this, Reading Stephen Hawking books and what not!🤦🏻‍♂️

[@octs609]

Lmao i am lucky I am in grade 7 just watching this for so many hours straight

[@ImOnTheTube]

Somewhere out there at 2:34 am there are some physics students watching fashion videos.

[@kalee6]

@@octs609 well you will age fast haha enjoy while it lasts

[@ajesusencounter8261]

Woah that part about the alarm clocks being at different times is astonishing. The universe is full of wonders...

[@evelinbennett8629]

100 percent

[@shelly7160]

So basically the speed of light, which is always constant, proves that time is relative.

[@rockwithyou2006]

*in a given medium.

[@hybmnzz2658]

@@rockwithyou2006 nope it is a constant. The medium stuff is incredibly complicated and its not like the photons speed is actually slower.

[@vedantsridhar8378]

@@rockwithyou2006 In fact in the 1800s the theory was that light propagated through an invisible medium called the 'luminiferous Aether'. Sadly the Michelson-Morley experiment disproved its existence. Light travels through a vacuum at constant speed.

[@oliverphippen1957]

Time is constant along with light BUT our perception of it is relative to each other like the George Floyd Murder or death by suicide ????He did have a lot of drugs in him ?????

[@chad63]

if speed of light is constatnt, then time must also be constant, therefore time dilation is bullshit.

[@P444ndog]

i've been trying to understand the theory of relativity for 3 hours now, this video really help me

[@gecko1131]

Can you explain the Theory of relativity in 45 days so that I can understand.

[@hybmnzz2658]

Its called reading a textbook

[@vips2647]

Bro I can't control my laughter 😂😂😂😂

[@anonymous031]

Time is relativistic . Means 45 days would slow down to another time maybe 45 years if she teaches at the speed of light

[@boss_niko]

you are a noob

[@jeffrey6244]

Time does not slow down for the traveler; it *appears* to slow down for someone watching the traveler - who in turn sees time for the *watcher* running more slowly!

[@enrichment9899]

+Jeff Rey Time slows down relative to the observer.

[@marcelovachetta5254]

+Jeff Rey Correct. The stationary observer concludes that the moving clock runs slower. Each observer sees his clock running at normal speed.

[@MegaTropicalstorm]

+Jeff Rey The traveler doesn't really see the time for the observer running slow. It's Twin Paradox which would somehow indicate the traveler to think of the previous view which is not true. As the traveler assumes his initial point at the front of his path to his destination which according to him will be at the rear, he soon realizes that the instant at which time for initial point t = 0 is not the same in case of that of his destination. The clock of the later runs slightly ahead of the earlier one. Their clocks stay out of synchronization. In order to calculate the time on the clock of the observer the traveler must take that of his destination's clock into account.

[@trtnec]

+Jeff Rey no time does not "appear" to slow, it DOES slow, for both parties. It's just that it's relative for both. It literally is slowing though, as you could theoretically use time dilation to time travel.

[@Habasmall93]

+trtnec I remember readed somewhere that say time slow near a heavy object, like a blackhole. Is that true?

[@kushpa1]

I love your physics animations, they are very educational and easy to understand. Thank you for providing all this wonderful knowledge in a format that is accessible to all, it is something we desperately need in society, as people become less and less engaged with educating themselves in the sciences!

[@victorcontreras9138]

Very intriguing! I didn't quite grasp it all right away and am going to watch the video several times over again! It's so interesting.

[@samueljaihindh]

Awesome.. "Interstellar" brought me here.. I am somewhat clever now. Very Simplified explanation.

[@roberttom4401]

Viven Samuel me too

[@kidproblem1]

+Viven Samuel tht mirror example explains the time relativity in the tidal wave scene

[@dppalmero]

Me too hahaha

[@aseguradojaicel]

+Viven Samuel omg same

[@andythomas7920]

+Viven Samuel Same! Still none the wiser haha!

[@black_mesa_band]

HOW THE FUCK DID HE COME OUT WITH THIS OUT OF ABSOLUTELY NOWHERE???

[@adamblackler488]

+Molun Via thought, maths and observation.

[@jasonlast7091]

+Adam Blackler Well, I didn't realise it until now, but it's largely common sense once you understand basic physics (like super basic start of high school).

[@jerryxia1983]

Imagination

[@jasonlast7091]

***** Yeah, I know that, I was not saying that what he said was simple for it's time, I was just saying that I thought it would be harder, I'm fully aware that discoveries like these are gauged relative to their times. And I hardly think that what I said was cocky.

[@jasonlast7091]

***** I didn't say it *was* common sense, I said that it was *largely* common sense, as in simple logical deduction, as was explained in the video. You're acting like I don't understand the weight behind these discoveries, I do, and what I was trying to reflect was the video explaining it well and making it simple apposed to the theory itself being simple.

[@PavaniGanga]

So grateful for your videos on the theories of relativity and quantum mechanics. You are truly a master teacher. Over the decades of my long life I have sought on a number of occasions to get a better notion of these theories. Thank goodness I found your channel, which has helped me to a "good enough" impression of the topic. Well, except for General Relativity. I'm still struggling with theories about gravity....! Best regards.

[@icharmreyn]

Okay. This my 3rd video of this theory now I finally understand it. Thanks for this

[@entoythedragon8463]

Should I be worried that even a simplified explanation is still not getting in my head?

[@oscarlowry4265]

not if it's literally the theory of relativity

[@OneBiteoftheCherry]

No. Theory of relativity is advanced science at the best of times. Einstein was a genius don't forget!

[@repeatrepeatrepeat]

You should not be worried if you don't understand the explanation but you should be worried if you stop trying to understand the explanation.

[@luisbecerra7101]

It takes time to accept that space and time are not absolutes but you get there , just keep watching videos it's not that hard like l said it takes time for your brain to accept it cause it's counterintuitive big time but it's been proven with experiments in real life

[@thomassaba9886]

yes it's cheaper to see it on the video than to travel in space with Virgin airlines...after so a trip you would understand it immediately........

[@shridhars6939]

Who left the kids to play in moving truck

[@LondonCityGirl]

That comment made me smile - lol

[@mmmjjjxxxx]

When I understand nothing in the video:

[@HardRockMiner]

It was the 50s. Kids couldn't die from things like that then. lol!

[@shridhars6939]

@@HardRockMiner good one 👍

[@shridhars6939]

@@HardRockMiner did u understand theory of special relativity ..

[@jonnybgoode007]

Thanks for such a 'user- friendly" way of describing this extremely difficult to understand material. I appreciate. :)

[@yobathecat3432]

Part 1 : Classical Theory 0:10 Part 2 : Special Theory of Relativity - Time Dilation 1:28 Part 3 : Special Theory of Relativity - Length Contraction 3:33 Part 4 : General Theory of Relativity 5:30

[@stroys7061]

I studied relativity in my college physics course in 1974. As a math major the equations were easy to follow. For anyone without a strong math education this is a terrific explanation. Well done! Thx

[@mklik4]

Is it possible to understand without math why you can theoretically reach close to the speed of light, but not the speed of light?

[@tylerdurden3722]

I think, with math, is the only why to successfully explain it. It's impossible to hit the nail square on the head with analogies.

[@thomassaba9886]

No , cuz Einstein had trouble to find the mathematics formulas too for this.....

[@davidangel6940]

Just want to thank you! This is amazing. You have a real gift of simplifying insanely complex concepts. I really enjoyed it.

[@LondonCityGirl]

thanks David - I really appreciate your leaving such a nice comment :)

[@BullstuffLambostuffUSA]

love you

[@1349sohelas]

that escalated very quickly

[@chrissame]

I want to thank you so much for this! Its making a lot of sense!

[@nassertawil9449]

David Angel

[@pragyaprabirranjandeka1583]

Never found such topics explained easier than this.... simply awesome

[@jlvandat69]

Great video, thank you. I keep thinking that, generally speaking, we're using multiple concepts derived from one man's amazing intellect and even though most of Einstein's theories have been validated, we will very likely find his work as one step in the ladder of knowledge (similar to Newton's work). It seems like there was a lot of work necessary to ensure the speed of light remains constant for all observers, e.g., time dilation and length contraction. My humble, uninformed guess is that we'll find exceptions and limitations to the equations that Einstein developed, and one day be able to travel at speeds beyond the speed of light. However, odds are I won't be around to pat myself on the back.

[@Eggy79]

Really going out on a limb saying Einstein didn't have everything figured out and there's more to reality than what he figured out lol

[@playboldrcb2070]

I WAS CONFUSED WITH TIME DILATION. THAT MIRROR THING. WELL THANKS FOR MAKING THE VIDEO. IT HELPED ME A LOT.

[@SkillfulSinner]

The term "Time slows down" confused because when I thought about it I thought that meant smaller speed of light. When really it doesn't only slow the minute, it makes it larger. So a larger minute (or slower minute) allows a larger distance for light light to travel.

[@LondonCityGirl]

ThePackapunchmaster yup, exactly - time dilation :)

[@irynamaliuk1547]

Mind blowing! thanks for the simple explanation!

[@faraimteliso3674]

Time dilation can be observed when your wife says she needs 5 minutes to get dressed. On your watch it passed 45 minutes, but for her it’s still 5 minutes 😂

[@thomassaba9886]

great

[@RohithBKMusic]

😮

[@khursheedahmad5546]

Graet example u must be awarded for that😁😁😁

[@prayerforceone]

Thanks! That explains everything!

[@muhammadnabeel7133]

I rarely comment on KZbin but your video really forced me to sign in and comment. I thought, it would be more better to visualize this concept just in few mins before watching Interstellar. And after watching this video, I can easily comment that, this is one of the most interesting and attractive videos I have ever seen. Thanks for sharing :)

[@LondonCityGirl]

muhammad nabeel So pleased to hear you enjoyed the video and found it helpful! Feedback like this is wonderful so thanks for taking the time to sign in and comment ;)

[@beanos1547]

I'm 14 years old and i am really interested in astrophysics and space. The idea about quantum mechanics and relativity is amazing. This video really helped me to understand it. Great video! You earned a subscriber :)

[@LondonCityGirl]

Will Smith Great to have you supporting the channel :) And pleased you liked the video.

[@martyrdoom231]

I'm 15 and I'm as fascinated about physics as much as you are too

[@sherlock766]

I was so happy in my life. Nothing really mattered to me. Everything seemed so beautiful and magical. Then I saw Theory of Relativity. My thoughts are now devolving. Thank you Einstein.

[@ajitbhale8211]

I have watched many videos on the same topic and believe me this one is the best👍🏼

[@gillyjames9609]

I haven't got the time or PATIENCE to try to understand this! Good luck everyone! I'm going back to my dot to dot book!

[@Anatolij86]

But if you approached the speed of light you would have more time!

[@deb000rah]

@@Anatolij86 😂😂

[@abrarswb]

The most simple and comprehensive explanation about relativity I have ever watched. Thanks to the channel.

[@geoden]

Well done! a refreshingly simple way of explaining relativity.

[@HBOMB-ht5pm]

Now I can look smart in front of people.

[@_8shipo589]

@tommy cane115 calm down buddy, no one here is figthing with you

[@meurhioandarasti0955]

@tommy cane115 ogga boga

[@hanscesa5678]

@tommy cane115 Here you are again, saying bullshit. Anyway, what you said about the other video that black hole was made because of the fact that einstein's theories can't be proven. Well, apparently, a black hole has been observed recently proving Einstein's theory once again lmao

[@justarandomstranger279]

@tommy cane115 then let me ask you..do you know more than tesla?or do you know more than Einstein perhaps?

[@vit4213]

@tommy cane115 Your parents clearly didn't take good care of you. Here you are making insults on people for the past 3 months. Get a life and stop using the same sentences.

[@junaidsyed4775]

Very Informative.... Thank you

[@LondonCityGirl]

+Junaid Syed my pleasure, thanks for watching :)

[@Pantano63]

+LondonCityGirl How can we take advantage of this?

[@jb111082]

+leonardo h What do you mean?

[@jb111082]

Kartheyan Sivalingam Knowing Relativity helped create the GPS.

[@islamicmathematician7074]

Kartheyan Sivalingam Theory of Relativity gave us Nuclear power plus the GPS.And medicine!REEEAAALLLYYY.QUANTUM MECHANICS DETERMINES QUANTUM PARTICLES.THIS IS PHYSICS

[@sureshgo7658]

This is one of the simplest n nicest explanations I've ever seen. Cheers.

[@mehoneybadger999]

wish i could like this 10-20 times, thank you so much :)

[@adhishbansal0516]

The best explanation of relativity i’ve watched until now ! Thankyou !

[@AgaGanesha]

oh wow, i've been searching explanation of theories relativity for around 10 month.... and this is the best 1 i found yet. thx alot :D

[@salvi6041]

This is literally one of the best explanation of the theory of relativity on the internet!!

[@sevdalink6676]

I suggest anybody who is a beginner to watch this video first. I did it and understood everything very well. Then I watched some other videos where I found some better explained details, but without this video first, I would not understand anything. Thanks a lot.

[@wojiaobill]

Actually, you can travel back in time, you just need a flux capacitor and 1.21 gigawatts of electricity!

[@Pranav-rp8wi]

And then try not to loose that magazine 😂

[@siresquire9439]

And a velocity of 88 mph in a DeLorean Motor car: Ingredients Bro:

[@deltabravo1969]

Hey you! Get your damn hands off her!

[@astrangerr3461]

Sure, try it ANOTHER TIME

[@TheOldGord]

The hard part is getting a Delorean up to 88mph. Now that’s almost impossible 😄

[@your_dad_18]

Special theory of confusion. I mastered this one. Next is of relativity. Let's go

[@bradybell6129]

I watched this one just after watching the one on quantum physics. I still slowed down the speed by X.75, but I thought this one spoke at a more conversational rhythm, as opposed to a mechanical rhythm and thus was easier to understand.

[@mdshershahafghan8543]

You Explained in a vivid and simple way... A very confusing still exceptionally amazing theory ...just awesome...liked so much..lots of ❤️❤️❤️ from India

[@van_k]

Thank you very much for taking the time to explain those concepts in a simple way. It is really helpful for grasping the main idea. I also enjoy your intelligent British accent very much.

[@carlspheno]

Well explained. I searched at least 10 videos explain about relativity. This is the easiest to understand.

[@LondonCityGirl]

Harvey Sia thank you so much, that's an awesome comment to read! :D

[@paulskie7480]

From the formula speed= dist/ time. Given the speed of light to be constant, time= dist/ speed( of light). It follows that when the distance increases so does the time coz they are directly proportional. Isnt it the reverse of time dilation?

[@leviramirez3765]

What an awesome fast and informative video. Thank you so much for the upload LondonCityGirl , You Rock 💯

[@jasonludlow8057]

Your VERY simple explanation just f**ked me up for the rest of my day..thanks🤣

[@akhilswaminathan1317]

They complicated it. its actually understandable.

[@rakesh010668]

This is the best explanation I could ever get. Thank you for clearing all my doubts. 🤗🤗

[@seeunkang2806]

Thank you for easy and explicit explanation!!

[@ambroseting5985]

One of the best explainers I've seen so far!

[@pup1008]

That was REALLY good, probably the best explanation I have seen! No nerds getting off on complex explantions just simple, clear dialogue with effective graphics - BRILLIANT - Well done! Just one point...... the bullet still has it's cartridge attatched! ; )

[@LondonCityGirl]

John Dwyer thank you! So pleased by the feedback as the aim was to keep it simple for people who have an interest and curiosity but aren't planning to study for a phd in physics :)

[@ghanshyamsharma6527]

I don't understand perfectly the general theory of relativity. But special theory was explained very well

[@rifatzehra6546]

You can't understand general one but you understood special one 😂

[@zecon990]

@@rifatzehra6546 are you dumb? The Special theory was published 10 years prior

[@yobathecat3432]

1:21 is where I paused and need time to fully process and digest the information so the gears in my mind could comprehend / or mindblown (good video btw)

[@nostalgia63]

Nice video. Philochrony is the theory that describes the nature of time and demonstrates its existence. Time is magnitive: objective, Imperceptible (intervals) and measurable.

[@akshaychoudhary1617]

londoncity girl u r a very Beautiful person.. cuz of the way u explained it.. to the point no rubbish very precise and very simplified illustrations... no irrelevant time wasting gimmicks around in the video... saw 3 videos on relativity nd urs was the most easy to understand for my brothers who thought interstellar was based upon an imagination 😂😂

[@nehathejedi4962]

Another interesting point is that just like the clocks slowing down when in motion at very high speeds (comparable to c) , our heart rate, breathing rates, etc also slow down (relative to the stationary observer) because these can also be considered some biological clocks. This would mean that ageing is slowed if we move at very high speeds. And btw it was funny to see the TARDIS at 4:46 XD

[@LondonCityGirl]

+Neha The Jedi Awesome that you noticed! :D

[@sonanegi1]

yups!! :D +Neha the Jedi

[@samikhan3754]

So what is a person's death in this perspective, his biological clock's freezed or is he traveling at the speed of light?

[@daviddavidson1090]

From the perspective of the person traveling at the high speed, though, their life doesn't actually seem to last any longer.

[@yahiah5519]

i think it seem to life longer acc to the people on the Earth but acc to himself his life is still the same

[@ABHISHEKKUMAR-fr5lv]

The easiest way to understand relativity is this video. Thanks,thanks,thanks to make the video to easily understand relativity.

[@cptnoremac]

I'm sure someone else has pointed this out, but the length contraction only happens along the axis of motion, so the boy should be drawn thinner but not shorter. Also, to clarify, the boy in the ship doesn't experience time to be slower. To him, everything is normal in the ship. It's only from the perspective of someone on Earth (or any other reference frame) that the ship's time is dilated. And likewise from his perspective, everyone else's clocks are slow. Thanks for the video!

[@wkhan12]

I watched several videos to understand but you have made it simplest relatively

[@FlunkTVGaming]

*If anyone is confused, here is a quick explanation:* Say there are two sets of mirrors that are both bouncing a beam of light back and forth vertically. One set of mirrors is traveling at the speed of light horizontally while the other is stationary. Pretend you are moving at the speed of light along side the moving set of mirrors. The light that is bouncing between the moving mirrors is traveling a greater distance in a shorter amount of time. That means the light beam is traveling faster than light. Of course, there is nothing in the entire universe that can go faster than light, so in order to compensate for this paradox, time -according to the person moving with the moving set of mirrors - goes slower in order for light to travel a greater distance in the same amount of time as the stationary set of mirrors. Basically, time has to slow down in order for you to travel a greater distance in the same amount of time as something staying still (AKA speed=distance/time)

[@bigge8181]

James Maniac so essentially, where the speed of the ball being thrown in basic relativity increases, the speed of light is constant so time must move slower insetad

[@FlunkTVGaming]

Eric Stecher Exactly! instead*

[@HimanshuSharma-oy9ss]

I loved it. Efficiently simplified explanation.

[@user-dw3wn6ij6p]

Hence, time dilation and length contraction is necessary so that the speed of light is the same for all, that is 186,000 miles per second, I'm trying to wrap my head around the theory of relativity. Time is relative, not constant. Thanks so much, wonderful video.

[@kelly23011]

I can't do English well, but you make me writing comment now. :-) It was so easy to understand!! Thank you for making this video!

[@LondonCityGirl]

SE Park you have great English :) Thank you for taking the time to write such a nice comment. It's much appreciated :D

[@saarahnafeez2221]

thank you so much, this was a great concise video :)

[@marshmelows]

This is the only video I found that included the sped = distance / time ideai. Very well explained

[@abl1699]

Really cool explanation .... One of the best one I have ever seen or read. 👍🏼👍🏼

[@doctorpatil]

It is the clearest explaination of relativity I have come across.

[@michaelpisciarino5348]

1:25 Time Dilation 2:45 Speed = Distance/Time 3:33 Special Theory of Relativity- Length Contraction 4:38 Spacetime/Time Travel 5:15 Infinite Energy could send one back in time? 5:30 General Theory of Relativity (warping of space time) 6:17 How do we know it is true? - GPS - Clocks Out of sync

[@marcpadilla1094]

Wonderful how progress is made from one point of reference to a better understanding and therefore relative to more progress. Newtonian relativity became the inspiration for general and special relativity on first tgw mechanics of gravity and motion to incorporate constant motion, space,and time to explain how the universe, not only the planets are formed and arranged the way they are in orbit of one another. I get the gist of things and see how well i can explain it to myself and of that's in the ball park.

[@jeffreyoneill6439]

Very clearly and well done. Thank you.

[@alanstrong3295]

Would have been glad to have you as my science teacher.

[@charlesbrightman4237]

Clocks being different: The forces acting upon the clocks are different, which acts upon the clocks in ways to change their respective "time". Gravity is different on different spots on the Earth as well as magnetic field strengths may be different as one moves and/or the field moves through it. While not all matter is considered magnetic, all matter can be affected by magnetism due to the magnetic fields generated by the moving electrons in atoms.

[@michaeltowler2632]

+Charles Brightman I was thinking the exact same thing the clocks could have been affected by gravity but that would up set the experiment

[@charlesbrightman4237]

+Michael Towler Not only gravity, but recently I believe some people received a noble prize finding out that neutrinos have mass. As neutrinos pass through certainly aircraft and therefore even a clock on an aircraft, it would seem to me that any neutrino impacts traveling at high speed in addition to the speed of the aircraft would affect the clocks on that aircraft. Albeit probably only tiny impacts, but probably cumulative as well. Then also the variability of the Earth's magnetic field which would affect all matter as a moving electron in an atom would generate a moving magnetic field that would be acted upon. Since the "time" difference between the stationary clock and the moving clock is only very small, this sure seems very reasonable to me utilizing known laws of physics.

[@sharanammachangler4740]

Well explained by this channel very good so thank you for this.. ..... ......🙏

[@crlaunch92]

Great video! As an engineer I want to point out that a bullet does not travel with its cartridge as in 4:50-5:30.. this is often portrayed wrongly. A cartridge holds the powder which is ignited by the primer. This rise in pressure due to combustion causes the bullet (the yellow part in this video) to separate from the cartridge and be pushed through the barrel. The cartridge remains behind and some of this energy is used to eject it out the side. In some cases it is ejected manually by the operator.

[@menukapomu7831]

"It is said that once einstein was asked to explain the theory of relativity. He said, put your hand on hot stove for a minute it seems like an hour. But, sit next to a beautiful woman for an hour it seems like a minute. That's relativity."

[@zahirabenmekhloua7826]

sit next to an ugly woman for one second it seems like a decade that's time dilation

[@shafiullahfaisal7083]

@juveman123 haha u r right

[@mercurion1000]

Hang on in the first illustration when the ball is thrown to the back of the truck isn't it going 50-10=40mph? Then when it's thrown back it is at 60.

[@LondonCityGirl]

Yep - that's in the description :) And I think I added an annotation too a while back.

[@DSilsbury]

Not relative to the kids throwing the ball. Only to someone stood on the road.

[@prudviraj1229]

no the truck and ball r moving in opposite directions in that case so it is 40+10 50

[@DSilsbury]

prudvi raj no its not. When you consider the earth's spin and the fact we are in a galaxy that's moving what is the real speed of the ball? This is the relative bit of relativity. It only makes sense to talk of things moving relative to one another. so the ball is only moving at 50 mph relative to someone stood on the ground, but between the kids it is moving at 10 mph.

[@PinkyMinions]

mercurion1000 when you know you are getting an F, its time to get bullshit about blackholes....

[@aartikushwaha3517]

Excellent explanation 😀 I was seeking for this kind of explanation...👍

[@SadBoy3131]

From what I’ve learned. We time travel but at a tiny level n the faster we go, the slower time goes

[@kevuseth8027]

Oh my god, this like clears up all confusion. I can't thank you enough for this video. Could you post some sources for this info though? Thank you so much.

[@abhiadsul6538]

That's interesting....Thanks Einstein for thinking so much about this.

[@exoyey2000]

I have been watching lots of videos about this topic,,, I AM TRYING..... THIS IS CRAZY!

[@paths2go]

Fantastic explanation! great work!

[@-30h-work-week]

5:21 "This is why we cannot travel back in time. We simply have not been able to reach a greater speed than the speed of light." :)) The fastest men have ever travelled was on Apollo 10 re-entering Earth at 0.0037% lightspeed (around 7 miles / 11 km. per second). That's when we missed the best chance to "be able to reach a greater speed than the speed of light".

[@Mirsab]

Per hour or per minute?

[@-30h-work-week]

Muhammad Mirsab My bad. I meant... per second. It's 11 km/s. :) I'll fix that.

[@anterpants]

sarsunflower You would actually need greater than infinite to go faster than light. It takes infinite energy to reach it. That's why the "fun to think about" tachyons exist faster than light, they do not accelerate to that speed.

[@thomaslynn233]

sarsunflower You'd still not get to faster than the speed of light. think of speed, mass, and energy as a right-angle triangle. if you have mass (the vertical part of the triangle) no matter how much energy you put in (the horizontal part of the triangle), the angle of the hypotenuse (the long side) would never be flat. By saying you can go backwards in time with enough energy is like saying you can make a right-angle triangle start bending the other way by making the length of the horizontal line bigger.

[@salmanagazi4621]

l'ombelico del mondo i thought that if an object exeeds the speed of light it mass has to be infinite?

[@Deaf_Notes]

So basically in theory we can travel forward in time but not backwards cool :D

[@LondonCityGirl]

John Anthony Martinez pretty much sums it up :)

[@georgeodhiambo598]

You can travel backwards in time if you go past the speed of light.

[@obiwankanobe480]

The best explanation on youtube.

[@burtvincent1278]

Thank You. I was a able to follow the logic along.

[@djjohnmerry1980]

wow thanks this video was really helpful I didn't no any of this stuff