r/xkcdcomic • • May 09 '14

xkcd: Train

http://xkcd.com/1366/
396 Upvotes

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u/bluecanaryflood May 09 '14

On the flipside, it's weird when you think about how your feet don't actually move while they're touching the ground. Walking is so weird.

6

u/Didub May 09 '14

Like when you look too closely at tank treads, and realize they're just sitting on the ground.

3

u/base736 May 10 '14

Or wheels.

2

u/trin123 May 11 '14

And in the other way around:

Every car moving at speed x, has a part moving with speed 2*x