int main(void) {
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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听着很香，但坑比客房卫生死角还多别上头！这东西不是神，踩一个坑就可能亏不少，4个核心坑，个个都要避开。
BBC國際事務首席記者 麗斯·杜塞特（Lyse Doucet）