Special Relativity: Crash Course Physics #42

So we've all heard of relativity, right? But... what is relativity? And how does it relate to light? And motion? In this episode of Crash Course Physics, Shini talks to us about perspective, observation, and how relativity is REALLY weird!
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[crashcourse]

We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!

[TheSnakeboy]

"You already know that V x T = D"


*you overestimate me*

[jessicaonymous]

0:23 I love how Bob is flying backwards, presumably from air drag, even though he's in a vacuum

[dr.bipinmandar]

After watching this, I realized why Einstien is regarded a genius.

[rh]

My mind is so fucked right now i forgot how to hold a spoon

[fernandes]

How Einstein conjured this madness up. Wish I could :-D

[JugheadJones]

Dr. Somara, I cannot imagine how mindbogglingly hard it must have been to get through all of this in school and UNI. Thanks for trying to make this palatable for people like me who are fascinated by it, but just not driven enough to take it on! Really cool stuff.

[twentytwo]

My bicycle can't travel faster than light, it's two-tired

[rustysim]

English is my first language and she still spoke fast as hell...

[spookeymo]

that's the first video on spcial relativity that explained it so well i understood! most people don't include maths in their explanation because they think it'll make things more complicated but it actually made it so much easier to comprehend. thank you for your series!

[swiftlymurmurs]

Man, that is... Mindbending. We're used to thinking time and space are constant, and can't be shaped to our will. But when you realise it's all conatantly warping and stretching it gets... a bit confusing

[amosandrecantini]

I'm the only one who's watched this video twice and lowered the speed to 0.5 to understand something??

[manofcultura]

Is this real life or is this just fantasy? Caught in a land slide, no escape from reality.

[Kithairon]

If Bob is moving at a constant speed through a vacuum, why are his arms draged behind him?

[alekdaniels]

I just dropped by to tell you I'm only looking for a special recipie to cook for relatives and got subjected to a serious mental injury by clicking this video.

[benhurston]

I've watched several videos in attempt to understand special relativity/time dilation, and either (a) all of the previous videos have been slowly adding to my understanding to the point where when I watched this video, it finally made sense, or (b) this video does the best job of explaining special relativity that I've found yet! It's probably a little of both, but either way, great job, and THANK YOU!

[Donezekiele]

Did anyone else see a resemblance between the animation with the train and Westworld?

[matyourin]

nothing gets easier to understand by telling it faster...

while I somehow enjoyed crash course history and philosophy, these physics crashes just seem to me like a futile attempt to reduce complex topics and speed them up to make them somehow fit this format - so that the result is only understood by those who alrdeady understood it in the first place. maybe that's just my impression as a physics teacher...but I would take a complete series of videos instead of one to get each of these topics.

[matthewdockter]

You guys did a good job on explaining this. This and PBS Space Time are two great videos on the topic.

[Worgak]

Oh my god, Special Relativity finally makes sense!
I've tryed to wrap my head around it several times now, and had it explained to me in several diffrent matters.
Yours is the one that finally made it click! Thank you so much!
The world is confusig as ever, but at the same time, it makes just a little more sense to me.