There are a lot of simple, intuitive explanations of this to be had out there … but I kind of hate them all. You might google around a bit and find discussion of something called "relativistic mass," and how it requires more force to accelerate an object that's already moving at a high velocity, stuff like that. That's a venerable way of interpreting the mathematics of special relativity, but I find it unnecessarily misleading, and confusing to the student who's just dipping her first toe into the ocean of modern physics. It makes the universe sound like a much different, and much less wonderful, place than it really is, and for that I kind of resent it.

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Via: Reddit

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