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.
Осужденный за терроризм в лесу российский подросток обжаловал приговор08:59。关于这个话题，新收录的资料提供了深入分析
。业内人士推荐新收录的资料作为进阶阅读
Госдума приняла закон о запрете депортации одной категории иностранцев14:59
But what do we do with this data?。新收录的资料是该领域的重要参考