Flat surfaces surf past each other on the peak of a wave

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Enlarge / Some surfaces, like sandpaper, create extra friction than others. Daniel Machado / Flickr A prepare dinner’s response to cockroaches within the kitchen is an efficient approximation of a physicist’s response to friction: not solely is it undesirable, it’s exhausting to eliminate. OK, our analogy falls at a final hurdle: in contrast to cooks, …
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