Why is Relativity Hard? | Special Relativity Chapter 1
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- Опубликовано: 30 янв 2018
- Thanks to www.brilliant.org/minutephysics for supporting this video!
Thanks to my friend Mark Rober ( / @markrober ) for making the spacetime globe, and to Grant Sanderson ( / 3blue1brown ) for inspiration.
Support MinutePhysics on Patreon! / minutephysics
Link to Patreon Supporters: www.minutephysics.com/supporters/
This is the first in a series of videos about special relativity. This is definitely not an academic course, but it's going to be a more in depth and developed exploration of a single topic than a typical standalone MinutePhysics video. I've been greatly inspired (and heckled) to do this by my friend Grant Sanderson of 3blue1brown who's set the standard for this kind of thing with his excellent series - serieses? - on calculus and linear algebra.
So, special relativity. Special relativity is one of the most popularly famous ideas in physics - it's that thing that Einstein figured out about the speed of light and space and time and E=mc^2! It changed our understanding of the universe. And its core ideas are accessible in principle to anyone who understands some basic algebra and geometry - you don't even need to know calculus!
And yet in spite of this, special relativity is one of the subjects in physics that confuses the most people, and in many cases turns them away from physics altogether.
MinutePhysics is on twitter - @minutephysics
And facebook - / minutephysics
And Google+ (does anyone use this any more?) - bit.ly/qzEwc6
Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich 
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Ooh I like this. And I also love how Grant is forcing everyone to up their game.
Does that everyone include you =P
Yeah.
Who the hell is grant
3Blue1Brown
Granted, I already did.
Special Relativity?
Yea, I'm gonna need a little more than a minute for this one
The Ace Of Spades That's why you'll get an entire *series* of minutes!
Well sometimes the episodes are 3-4 minutes so you have plenty of time :)
He should have dealt with quantum first. It is minute ("my newt") physics after all.
One of the side-benefits of this series is that -- from SOME one's perspective -- each episode will take _exactly_ one minute. ^_^
But time is relative
I got relatively excited by this. I think this will be a special series.
but only relatively special
I would explain how disappointed I am in you in general fashion; however, you seem like you wouldn't even relatively grasp the concept that I am trying to portray. Now stop wasting precious space, time, and energy.
master gamer 75 I think you overestimate yourself
Fuck why can't you see dislikes on comments? 😂 No. No. No... Okay it was a little bit funny... 😜
Yuu
i love going through my old liked videos it's like "turtle playing never gonna give you up on an otamatone" and then "Hi, I'm gonna talk about special relativity" this is why i don't know what to say when people ask me what i like
Oooooh, hardware on Minute Physics!
Awesome + 1
Hi Dave, great to see you here!
Dave! :D
Hey, Straya, and thanks for giving me a different perspective on all things electrical.
Nice seeing you here, Dave!
ooooh, Dave Jones is a Minute Physics fan!
3blue1brown has gotten pretty big it seems, and it makes me very happy to see other channels mention him so he gets even more exposure. Looking forward to this series! :)
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And it's even better that 3Blue1Brown has begun to hire people, expanding the team from just Grant alone.
But it's sometimes wayy more complicated than some wants their subscribed channels to be.. ActionLab veritasium is at the soft borderline for that
The idea of Grant Sanderson heckling other youtubers is hilarious
We took about a month at the end of my mechanics course to learn special relativity, and it’s truly mind boggling in it’s implications. Thanks for getting this video out there and making it more accessible to more people!
Yes! This is phenomenal! The world definitely needs more things towards the middle of that chart at 0:10. I’m very excited that we’re about to get another example of what that looks like when it’s done well. Nice work Grant :)
I totally agree. I have a BS Physics degree and I'm really looking forward to this. There is so much potential for excellent videos/content/visual explanations for subjects just above a high school level, but don't require a college degree. I love the Ben, Ben, and Blue podcast by the way. I listen to every one. I taught math for 5 years (in a California Mathnasium) and I saw so many students struggling, especially with Common Core. I wish our educational system was better and I'm hopeful that it will be in the future.
Muahaha, it's all coming together now.
3Blue1Brown What have you created
sorry to be off topic but does someone know a method to log back into an Instagram account..?
I was stupid forgot the login password. I would love any help you can give me.
@@KeyMan137 THE ULTIMATE, BALANCED, AND CLEAR SCIENTIFIC EXPLANATION OF TIME DILATION:
Consider what is E=mc2. c squared CLEARLY and necessarily represents a dimension of SPACE (ON BALANCE) in relation to E AND “m”. Indeed, BALANCED inertia/INERTIAL RESISTANCE is fundamental ON BALANCE. Consider what is a TWO dimensional surface OR SPACE ON BALANCE, AS invisible AND VISIBLE SPACE is CLEARLY fundamental ON BALANCE. E=mc2 is taken directly from F=ma. Consider TIME (AND time dilation) ON BALANCE. The stars AND PLANETS are POINTS in the night sky ON BALANCE, AND consider what is the speed of light (c) ON BALANCE. Great. Therefore, I have explained why THE PLANETS move away very, very, very, very slightly in relation to what is the Sun ON BALANCE. I have explained the cosmological redshift AND the supergiant stars. I have also CLEARLY explained the fourth dimension AND the term c4 from Einstein's field equations. ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). This CLEARLY AND NECESSARILY represents, INVOLVES, AND DESCRIBES what is possible/potential AND actual ON/IN BALANCE.
By Frank DiMeglio
I'm sold. I'll be here for all of it
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I think blaming Einstein for why spec. relativity is hard is just wrong. When you read Relativity, (the book he wrote on the subject) he actually explains it in a nice and intuitive way, stepping through the process going from Newtonian relativity to special relativity (and general) using trains as an example.
I'd wager that the difficulty comes from pop science culture, showing the most weird and wonderful things about relativity, quantum mechanics, or thermodynamics without providing any framework for why these things actually make sense. Look, the faster you go the more time slows down, look quantum mechanics has weird randomness isn't science great!
He wasn't blaming Einstein though... he only said, we don't need to figure out Special Relativity the same way Einstein did.
I have a copy of that. It's a great book, although the first chapter is a little tough. It gets easier after that.
@@rancidbeef582 What's the name of the book?
@@rocknrolla1211 "Relativity: The Special and General Theory" by Albert Einstein. I can't find my copy, but I read the intro on Amazon. The first chapter wasn't as tough as I remember... guess I'm smarter with age? LOL. There are apparently different translations (the original is in German). This one is the closest to what I read I believe: www.amazon.com/Relativity-Special-General-Theory-Physics/dp/048641714X/
@@rancidbeef582 10 EUR + 30 EUR Shipping ...?? Okay then
I need to buy this spacetime map.
SOMEONE START SELLING IT.
it turned out to buy? I also want to.
This made me excited!
Same!
Not, like, physically...but that display machine IS COOL!
This gave me anxiety.
F.B. Jeffers0n yeah man. Very excited. I literally said, "Yay!" When the video was over
Special realitivity squad unite!!!
Minute Physics is doing a series on special relativity you say? Take my money I say.
David Stoneback nope thanks, i'll watch the ad instead
What? Earth isn't flat?
No, it's shaped like the inside of a bowl.
With petunias in it.
Flat Earth is indeed a conspiracy. They don't want us to know the truth, but in fact the Earth is a globe!
PTNLemay
Its a lumpy ball
Quote of the day!!!!
"No I'm not! I'm an oblate spheroid."
More than a minute please
🙏 big fan
Ram ram bhai🙏
Ohhh hi sir. Glad to see u here
"hopefully you'll gain some intuition", it was inspired by grant allright
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To be perfectly honest, I had been losing interest in this channel. This revived it again. Looks to be a very interesting and promising series
I actually took a class on special relativity (it was split between SR and waves) last semester at Johns Hopkins. Using a bit of linear algebra and some 4-vectors made it seem like a much smaller feat. Really enjoyed the class overall, as it was sort of an intro to where physics can get a little wonky
I'm so pumped for this series!! Thank you for doing this!!!
When I took physics in high school, I went in thinking I'd be a star. Man, it was *tough* but these videos make it seem so simple
"We are all made of Star Stuff." - Carl Sagan in Cosmos. So you are right about that also.
I guess, because most of it isn't too diffcult once it clicks.
I remember a course at college for signal processing. We went there once a week don't really understanding the stuff. At the of the semester when I started learning for the test and realized, man that's all so easy. We should have done it way quicker. I can't see why we had so much trouble understanding it.
I'm stoked for this one!!
I stroked for this one ( ͡° ͜ʖ ͡°)
Hi bro
I cannot wait to watch the following episode of this serie 😍 !!
I'm a physics student and exactly like you said I never understand properly what I'm doing when working with relativity. That's because I've never learned properly about it, just a few courses squeezed in between other subjects.
If you can give me the intuition behind the equations, I will be super grateful 😄👍👍👍
I truly believe all channels of this kind are making a real difference. This type of content in such easy way of understanding at this price. I just feel really grateful. I would love to have all this content when I was a child. :) THANKS!!!!
YES! I didn't know I wanted this series until it showed up in my notifications.
This is awesome! I am very much looking forward to watching the rest of the series!
I actually took a course dedicated to special relativity during last semester and it was really interesting and I'm very excited to see how you portray it. :)
Wow, just wow. I was looking for something like this. And your analogy about the round earth and how it fits into our day to day life at 2:52 , was just amazing, I would like to learn about relativity that way. Thanks. First time I will be clicking that bell notification in any channel.
I hate the fact that it took me so long to realize this video had just came out. You really got me hooked and I was going to binge through the entire playlist. I'll be eagerly awaiting the upcoming chapters.
Kudos for mentioning _3Blue1Brown_ - incredibly good channel :D
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Most insane and humble at the same time youtuber I know.
I'm a physics student and this is actually going to be really useful ! I can't wait ! Thank you :)
Summer quarter of PHYS 122 has just started, and this is going to save me! Thank you!!!
I've taken a course in SR, but still I'm really looking forward do seeing your videos! They always seem to explain things in a way that gives you that Aha! feeling. And especially looking forward to seeing more of the contraption you tease us with!
I see we're of the same mind, Henry. When I was learning SR, I was amazed by how simple it was. All you need to understand it is a little linear algebra. But the problem is, algebra is too abstract. Our brains are hardwired for geometry, not equations. I was hoping to make a video series on it eventually. Now it looks like I won't have to. Can't wait. :)
I have learnt about SR several times, and each time I too am surprised that I get it and it's- ahem!- relatively simple. But then a few weeks go by and I try to remember and suddenly I can't: the details are gone. I'm not very mathy; I mean I do find mathematics fascinating but due to my anxieties over my inability to do any but the most basic arithmetic, I get bogged down by it and it doesn't stick.
I'm hoping this time will be different and I think so exactly because, as you say, my brain is more receptive to geometry than to equations. Fingers crossed.
Side note: I don't seem to have the same problem with GR. That one stuck, possibly because ti was explained to me in very unmathematical terms first.
+arcanics1971
To really learn physics (or math), reading or watching videos is not enough. You have to do problems, and lots of them. Try to find a copy of the first edition of Taylor and Wheeler's _Spacetime Physics_, which has loads of solved problems (I understand the second edition removed most of them).
+arcanics1971 That's strange. I've always found SR to follow naturally from the addition of time as the fourth dimension. But that could be because I was introduced to it geometrically. And I've always found GR to be a behemoth :D
+Michael Sommers Indeed. But the problem is that most math is very unintuitive and so we kinda have to brute force our brain to memorize it. If only all physics were geometric. Then perhaps it would be a lot easier.
+Feynstein 100
That's why you have to do lots of problems: to develop your intuition. Memorization doesn't help; you have to actually understand it, not just parrot it back on an exam (which is why, I suspect, so many people dislike math and physics: they can't take the shortcuts they can get away with in many other courses).
Ooh that's some nice machining. You should upload the design process of that.
I am so excited for this! I was just covering special/general relativity in our planetarium series yesterday, and I couldn't find any good videos to help with special relativity. SO EXCITED
I just finished all the episodes and this series is absolutely AWESOME!!!! Thank you soooo much! I learnt a lot and had a lot of fun
1:25 to 1:40 rap god recreation in physics 😂😂😂😂
_turns them away altogether_
Special relativity literally made me *love* physics lol
Sava Jevtić There was this class I took, which half of the syllabus (8 weeks) was about special relativity, with math methods later on. SR almost made me turn away from physics because of this reason. But one I started to learn math methods, it drew me back more than ever. I'm learning QM right now and I absolutely love it now
i'm excited about the upcoming series. can't wait!
I can not WAIT FOR THIS SERIES!
Hi Henry, I am a science teacher and the tool you are using at the end looks very usefull (+ saves me a lot of programming/black board time). Is this tool avalible on the market for purchase or was it custom build?
It shouldn't be difficutl to re-engineer, the mechanism was clearly visible.
I know but it is clear that most physicists are not that good at engineering/re-engineering :p Plus any blueprints would help much in stead of starting from nothing...
Second!
KillGui007 in the description he said Mark Rober made the device. Maybe you should ask him (he has a RUclips channel).
@@KillGui007 it was a custom build
I think RUclipsrs like yourself should follow Netflix’s model and release the entire series at once. Many of us, myself included, would binge the hell out of this. Just a thought..
The vast majority of viewers simply don't have such "stamina" to binge a full series of educational videos at once. They will probably watch only half of them then forget about the rest. Enthusiasts are always a minority and cannot support a channel.
Binging is not how to learn special relatively, or any mathematics or physics. It requires patience, determination, and a lot of problem solving.
You can always wait, and watch the playlist
This is so clever, it needs repeating: You can always wait, and watch the playlist.
That would prevent viewer comments from helping to shape subsequent episodes of the series. For example, I just posted a comment about the little-known yet profound equality "everything travels through 4D spacetime at the same (constant) speed that light travels through 3D space (in a vacuum)" which I hope will be covered in the series. The famous inequality that nothing travels (through 3D space) faster than light is just a corollary of the little-known equality. Another corollary is that the slower you travel in 3D space, the faster you age. Another corollary is that light traveling through a vacuum doesn't age.
Even 5 years later this is phenomenal, currently prepping for my exams for first semester and I actually have Special Relativity as a subject and these videos are a great help in reading up on the subject and reapeating some of the things I didn't get completely the first time around.
I'm sooooo looking forward to this series!!
Followed this fine up to 3:23 then, what's this? Live action minute physics?? Radical stuff!
They've had live action scenes before.
raydarable come on, man.
Just accept the joke
william41017 Sorry, I did t realize it was a joke.
I'm throwing my money at the screen for that space time globe, but nothing is happening!!! Seriously I need to buy one asap!!!
k1 Truth Seems like something they could build an app to simulate easy enough.
Ah! I've been looking for this! So glad you decided to try this approach!
I love this OMG! Awesome that you create this series! Thank you so much
Question please: if you travel 80% the speed of light away from a companion who is also traveling 80% the speed of light away from you, and the 3rd person stands on the planet in between and watches both travel away from them, will the two traveling age the same and the 3rd age faster?
Everyone will think they themselves are older.
Its been 2 weeks, wheres the 2nd chapter?... Can't wait
So excited for this series!
Thank you for this series❤️
From what I hear special relativity, despite the names, is much MUCH easier than general relativity. I assume that is why it does not get a full class on the subject - because it is in essence just a special hypothetical, and simpler case of general relativity - which I presume DOES get a full class.
elevown those equations he showed on the screen could be simplified by adding in gamma instead if all the square roots, and the equation for gamma is even included in those equations. Pretty sure he deliberately made it look confusing. Also, all of those equations can be derived by taking a calculus 2 course and from all of Newtons equations. I think it depends on the instructor, tbh, since SR is honestly not math intensive, and only slightly mentally intensive
I wish my school would teach this stuff.
Wow Im really excited about this series!!
Oh my I’ve never been more excited for a series before!!!!!!
It's insane to think that without youtube, I'd be living my life thinking that "the Earth is flat".
And still think that god is real.
@@schindlersredemption ez b8,m8
@@zedaddy3530 What in the name of -?
@@epsilon1563 he is just tryna bait and the best way to respond was just going back to the 2016
Some people are convinced BY RUclips that the Earth is flat.
If you really want a VERY good grounding of special relativity check out this book I've been reading: Special Relativity and Classical Field Theory by Susskind and Friedman
Cloud Wolf I’ll take you up on that. Are you in college?
Sharon Murphy ya im a electrical engineering freshman but I like to learn most of all. I read the book and take notes when I wait for classes
Sharon Murphy although I do warn u it has calc 3 and diff eq concepts heavily so I suggest u read after taking those courses like I did
If u have any questions about the book feel free to reply or message me on discord or my email (links in channel desc)
Cloud Wolf I’m taking diff eq right now so I’ll read as far as I can get before I get stuck and have to learn new diff eq stuff. Also I should mention that this is my moms account. My name is actually john. (It has RUclips red because she has google play)
That's a great project Henry. Looking forward to it.
Cant wait to see next video of this series!
So this is the intro to the Intro to Special Relativity Course?
This is the intro to intro to fallacy. The Special Relativity is a wrong theory. Take a look here: vixra.org/pdf/1904.0080v2.pdf
I'm still waiting
I can't wait. Release the videos quick! :D So excited!
It is such a great series on special relativity !
The geometric visualisation provided builds a great intuitions to learn this topic
I Discovered quite late !
Great efforts and thanks to Henry Reich !
Keep up the good work
Einstein's hair looks like cat whiskers. Coincidence? I think not!
35 views, 105 likes, lol only minute physics is that good
And ten minutes later there are 5,000 views
Micayah Ritchie it's a paradox not even special relatively can explain
I'm so excited for this! Looks promising, good luck, Henry.
Bravo! I m really excited about your spacetime globe
Can you make a video to explain what happens to the twins' paradox if the universe is a torus?
Jack Poon i think this Video Is Talking About it
ruclips.net/video/Bg9MVRQYmBQ/видео.html
Wait.... the world isn't flat?
1stGenGamer how can the earth be round if the universe is flat
i saw an asian with a flat face, therefore the earth is flat
Nah he is jokin
you are making video on special relativity!! That's awesome!!! I will watch every video of your series
So excited for this series
You lost me talking about this round earth idea.
shawn gately 😂
Round Earth. Flat Universe. I call shenanigans.
holographic principle
flat earth :p
Have you ever seen a pizza ? It's round and it's flat ...just like Earth, only a lot smaller and a lot more delicious.
More like chapter 0
I'm such excited for this series ^^
Looks amazing. I look forward to the next one.
Where can I buy the spacetime globe??? Just shut up and take my money!!
it turned out to buy? I also want to.
3 weeks later...
Please continue to make these videos! They are very subject opening for me.
I'm looking forward next chapters. Amazing job, congrats!!
Minute Physics won't do it....
Something "relatively" longer would be great
oof, you mentioned the shape of the earth. Prepare for a wave of a bunch of shoddy response videos from the flat earth community.
MOOSEWHISKER. Dude I was thinking the same thing. So far I haven't seen any flatearth idiots.
I hope they refrain. Especially since it's probably like 10% actual believers and 90% trolls. Not that I condemn occasional mocking of stupid ideas, but not at expense of spamming unrelated topics.
this group is too small to deal with. They mean nothing
don't thing Flat Earthers bother with physics.
Sometimes I wonder what reality is liker for flat Earthers. If my representation of sensory data processed through cognitive filters is different to yours, what is day to day life like for someone who dismisses meteorology, geology, aviation and general science as cover-ups?
I once tried to convince myself the Earth was flat, to gain some insight into their mindset. But everywhere I turned I found compelling evidence for a round Earth.
Very exciting! Keep 'em coming!
This is a great idea! Can't wait for the rest of the series!
Special relativity is easy… Literally one of the easiest courses I took in engineering undergrad. Now, general relativity is hard.
As I sit here and edit my videos, I wonder to myself if the speed of light in a vacuum is the same for all observers, regardless of the motion of the light source?
hahahah best subtle self-advertisement ever!
+BanditRants godly vids!
Bandit do you edit over at Vox?
Yes it is
LUCTIANITO was gonna say that!
I cannot wait to see your next videos. This is probably my favorite topic!
Awesome! In my physics class in 12th grade,my teacher used a similar aproach and really did everything with geometry first before teaching us the mathematics behind it. It helped me (the only one in our physics course who didn't take higher mathematics as well) understand what was going on.
the earth is round?
Gerrit van Vliet more like killary. Amirite fellow millennials
no. earth is the shape of a fidget spinner
Very cool. Looking forward to the next set of videos.
Great idea! Thanks for tackling this.
So cool! I can't wait for the next episode to come out!
Thank you for making one been waiting for it a lot of time!!!!
Wow, i like where minutephysics is heading!! This is exciting
So great! Thanks 3blue1brown
minutephysics *THANK* *YOU* *SO* *MUCH* *FOR* *THIS* *SERIES* ! :)
Great!!
SR had a tiny trembling couple of pages on my old Landau-Lifshitz Field Theory book...
Can't wait to be notified on the next chapters...
Count me in.
p.s. thanks for your great work, btw
Thank you very much for this series ❤️❤️
I’m excited for the next few chapters of this
I didn't check physics since a long time,like i was so much curious in past,but youtube never recommend it,so i focused on other things and forgot my passion about it(found this in someone's favorites).thank you💕