如果我们想尽快地径直穿过站满人群的广场,那么向前奔跑时就免不了发生冲撞,不得不一次又一次地停下脚步,重新起跑。用这种方法穿过人群要消耗不少的精力。这种情况若用物理术语表达就是:穿过广场的阻力(“人群的摩擦力”)与奔跑速度同人群密度的乘积成正比。不过,假使广场上所有的人都排列得整齐有序,那么在队列之间奔跑的人 If we want to go straight through the crowded square as soon as possible, we will inevitably collide when we run forward and stop and restart again and again. In this way through the crowd to consume a lot of energy. If this is the case in physical terms: Resistance through the square (“crowd friction”) is proportional to the product of running speed and population density. However, if all the people in the square are neatly arranged, then run between the queues