去年有段时间,电梯事故频繁发生,让大家对电梯心生畏惧,在商场乘坐自动扶手电梯时,也都十分小心。在小心的同时,我发现了一个奇怪的现象:电梯上面有人时,电梯的运行速度较快,而电梯上面没人时,运行速度则较慢。电梯是如何实现这一功能的呢?我去和同学们探讨,但他们也不知道原因,于是我们一起向物理老师请教,老师告诉我们:扶手电 Last time there was a period of time, frequent elevator accidents, so that everyone afraid of the elevator heart, escalators in the mall when riding an escalator, are also very careful. While careful, I found a weird phenomenon: when someone was on the elevator, the elevator was running faster, and when nobody was on the elevator, the speed was slower. How to achieve this function elevator? I went to discuss with the students, but they do not know the reason, so we consult with the physics teacher, the teacher told us: handrail