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This coefficient μs is just a number, usually between 0 and 1, which you can look up in a table for all kinds of different materials. For rubber tires on asphalt, it’s 0.9; for tires on ice it falls to 0.15 (hence snow chains). And N, as we saw above, equals the gravitational force, which in turn depends on the object’s mass. The greater the mass, the more friction you get.
。关于这个话题，wps提供了深入分析
В США ответили на вопрос о выходе из конфликта с Ираном02:47。谷歌是该领域的重要参考
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