Intro to Einstein's Special Relativity | Doc Physics

We'll talk about fat walruses, the equivalence of all inertial reference frames for all physical observations, and the constancy of the speed of light for all inertial observers. Enjoy getting your head mashed to a pulp.

[roxanabusuioc]

"and you know you can't judge a walrus until you've seen its mother" made my day HAHAHAH

[ProggyDrummer]

I was taking notes the first 2 minutes when my mom asked me what I was drawing(Walruses and fatherless Einstein).

I told her "Physics of course."

[BlackestEyes]

WOOO! GO GB! WE GOT A SHOUT OUT! 

"Who the heck is fat here?" just had me in tears... Your videos are the best ones man, keep it up!

[DocSchuster]

Not to worry - it's my mom's!

Also, the savings of crayola over terrible dry erase markers is huge. Finally, paper is much more flexible, and whiteboards always have that lingering background color. Hate 'em.

[richardchen]

This video made me laugh out loud. I will remember special relativity most clearly from now on. 

[kato]

You are more gifted at explaining this topic (and many many others) than the physics professors at my Ivy League university. Thank you and keep up the brilliant work!

[shiptube]

Great set of videos.  Thank you very much.

[CE]

With all due respect to Maxwell (he was a genius), given that Maxwell was able to articulate Maxwell's equations, Maxwell should have been able to deduce from that the theory of relativity.  He had that constant c right there in his equations!  A constant speed!  Too bad he died early.

[lomertamahon]

Poincare asserted the laws of physics are the same in every reference
frame, Michelson and Morley concluded the speed of light is constant in
every direction, and, in accounting for this phenomena, Lorentz accounted
for the fact everything is made of electrons and that electrons and
anything made of electrons undergoes transformations. Lorentz
formulated his four equations (the Lorentz Transformation), showing
contraction of time and space in the direction of motion, while no
contraction perpendicular to the motion, thus altering our concepts
of space-time -- So, what is Einstein's contribution (especially
since the former all pre-date him)? At best, Einstein is getting
plenary credit for "popularizing" a theory that was already established.

[sairapaks]

ur hilarious which makes it fun
Thanks for doing this i am from Pakistan was struggling with modern physics your videos really helped me alot... THANK YOU AND KEEP DOING THIS NICE WORK FOR PEOPLE LIKE ME 💖p.s. i made my mom subscribe to u:)
THANK YOU YOUTUBE!

[skkim]

Double Wow, this is very clear.    Thank you very much.

[realnightowl]

You're absolutely free to mess with my messed up mind

[superdog]

Thanks for the helpful lecture, and more importantly... thanks for the lols.

[MegaKarume]

Nicely explained...I'm just thinking and pondering on that theory...thank you for the video...

[rijabakhtawar]

Wow mister, can you sparkle some of your coolness over the world? I am sure you still won't run out of it. 👌 #TooCoolToHandle

[LanceHyena]

Awesome video, really good review for special relativity.

[janotyrann]

so is c a constant from all reference frames now? or from 1 or dont we know?

[vesuvandoppelganger]

"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."

I assume that light is passing the earth at c when the earth isn't moving towards or away from Algol.

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.

[rosiechow]

Could you do a film a video on frame references and galilean transformation?

[kadeynelson]

I wish this guy was my physics professor.