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I never understood why speed of light is a constant (c)... until now! [21:50] by FloatHeadPhysics (Oct 12, 2023) - YouTube (inv.nadeko.net)

submitted 1 week ago by [email protected] to c/[email protected]

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This video is a bit older now (over one year), but I just found about it. And I want to share it here, because it was very well explained, without boring stock videos or background music. It's just like a teacher would teach you, but with some enthusiasm behind it. I enjoy his videos so far.

Watch on YouTube: https://youtu.be/Zkv8sW6y3sY
Watch on Invidious, a more private and indirect way to watch: https://inv.nadeko.net/watch?v=Zkv8sW6y3sY

Video description:

Why is the speed of light the same in all reference frames? Let's rediscover the thought experiments that led Einstein to his special theory of relativity

Chapters:

00:00 Introduction
01:15 1/3 Detect motion with particles? (Thought experiment)
04:01 Inertia doesn't allow detecting constant velocity motion
06:18  2/3 Detect motion with waves? (Thought experiment) 
09:18 Medium doesn't allow detecting constant velocity motion
10:15 Constant velocity motion is RELATIVE!
11:02 3/3 Detect motion with light? (Thought experiment)
13:12 Does light break relativity? 
13:46 Michelson &amp; Morley's experiment (oversimplified) 
14:20 The logical conclusion - Speed of light is same in all frames

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[–] [email protected] 3 points 1 week ago (1 children)

Learning about this channel is seriously the best thing that's happened since the election! I've just moved onto that video as well, but because of the algorithm, not your latest suggestion.

[–] [email protected] 3 points 1 week ago

Their video about how curved spacetime causes the effects of gravity is also very well done.