this post was submitted on 17 Dec 2024
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Science

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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 month ago by thingsiplay@beehaw.org to c/science@beehaw.org
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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.

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 & Morley's experiment (oversimplified) 
14:20 The logical conclusion - Speed of light is same in all frames
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[–] myfavouritename@beehaw.org 3 points 1 month ago

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