ВСУ ударили по Брянску британскими ракетами. Под обстрел попал завод, есть жертвы19:57
But there has to be kinetic friction somewhere, and indeed there is—it’s between the wheel axles and the car itself. To rotate, the axle has to slide along some surface in the housing that holds it in place. But with roller bearings and lubrication, μk can be massively reduced, from 0.56 for dry steel on steel to something like 0.002.
。新收录的资料对此有专业解读
This story was originally featured on Fortune.com
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00446-7，推荐阅读新收录的资料获取更多信息
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