Albert Einstein's Theory of Relativity

Easy to understand animation explaining all of Einstein's Theory. Covers both Special Relativity and General Relativity.

• Category

  Science & Technology

[Eugene Khutoryansky]

Everyone, if you enjoyed this video, you can help more people find it in their YouTube Searches by clicking the like button under the video and writing a comment. Also, I recently completed a video on Quantum Mechanics, and the link to it is available at the end of the video up above. I will be posting new physics videos soon, so please subscribe if you want to get notifications on when they are ready. Thanks.

[acadianalien]

Man honestly your videos are awesome, especially the quantum physics one. It summarizes it so well and helps you understand why the wave equation collapses at the macroscopic level. Also this video made it crystal clear as to why mass needs to change, very helpful animation.

[Eugene Khutoryansky]

Thanks. I am glad you liked my videos and that you found them helpful.

[Lennyanimelover]

i don't understand one thing... you say that if adam moved at the speed of light when he returned to earth years would have passed for Sarah while it would have seemed as minutes to him. But you said before that it is not possible to tell which object is moving.. so wouldn't it also go the other way around, meaning in Sarah's perspective wouldn't it seem as minutes have passed while to adam years... :p

[Eugene Khutoryansky]

This is explained at 13:50. Each person see's the other person's clock as going slower only so long as no one is accelerating. From Adam's point of view, when he tries to turn around, he will think that there is a gravitational force balancing out the force from his rockets, causing him to remain still. From his point of view, this gravitational field will cause Sarah's clock to run faster than his. This is why Sarah and Adam will agree that Sarah is older when he returns.

[Saibrock]

What if Adam's ship moves away from Earth at a constant velocity, and takes a curved path without accelerating or decelerating, returning to Earth in a big circle? Wouldn't he then arrive only a few moments after he left, from Earth's perspective?

[Eugene Khutoryansky]

In Euclidean geometry, it is not possible to move in a curved path without accelerating or decelerating. Moving without acceleration in Euclidean geometry inherently means moving a straight line. If you are moving in a circle at constant speed, then you are constantly accelerating towards the center of the circle. Your total speed might be staying the same, but your velocities in the X and Y directions are constantly changing.

[MrChickenfruit]

Still a better love story than twilight!

[chologonzalo999]

I have to say that this is one of the greatest documentals of science, specially for relativty, that I've seen. GREAT WORK!

[bixlord]

awesome! great job!

[mishka133]

but what about the theory of observation? if you are in space, with nothing around you, would the effects of a gravitational pull still apply? or was it implied that since the ship itself has mass that it therefore has its own gravitational pull? this is really neat stuff to ponder :) i love it!

[Rosanella di-Costanzo]

Excellent!

[Dylan Gillespie]

Can someone explain 13:33 and the part after it to me? I think I understand it but not fully. So traveling at the speed of light would make time seem slower relative to who is viewing it, but it's the gravitational field caused by the object slowing down that causes it's time to go at a slower rate than whatever isn't affected by the field?

[psychoo0slimm]

if it is not accelarating it cant go faster....

[psychoo0slimm]

man superb video. Please answer one question: so you are saying(or Einstein) that when ever something is accelarating from another thing (lets say the ship is accelarating from earth) then time really passes slower for the accelarating thing(both ship and earth agrees on this)???????? what about when he reaches earth and he is deaccelarating(meaning his accelarating the other way). And if nobody accelarates and just moving with constant speed one from the other then is just an illusion????

[nirmal sams]

Speed of light is a constant and nothin can travel faster 'cause we perceive any event occurring in the universe by light hitting the object and striking our eyes thereby activating our visual channel .... Therefore any object travelling no matter at any speed will definitely be examined only if light is incident on it. Hence nothing is faster than light....like ordinary object light cannot accelerate or decelerate . It has a constant speed 3 e8 m/sec

[WonderstruckSophie]

wow, this is great! I could understand even if english is not my first language! congrats, really love it :)

[Th4w]

I just realized how it works. Basically, even if Adam's ship doesn't decelerate when he turns around, from Earth's point of view, he would have moved much further if he hadn't turned around, as he would have been traveling at a straight line away from it (But he has to curve). So, from that point of view, he is effectively decelerating. Is that right?

But from Adam's point of view his speed is exactly the same. What does earth look like when he's turning around?

[baldemaroo]

I'm Adam, and I'm having a hard time to wrap my head around this. I get it that it is like this but not why..