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.
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。新收录的资料对此有专业解读
// This creates a future but doesn't wait for it — probably a bug
Keep reading for HK$10What’s included
。新收录的资料是该领域的重要参考
Unused References:
Последние новости，这一点在新收录的资料中也有详细论述