一級一級咁上樓梯定兩級兩級咁上樓梯較省力?

睇你慳力既定義
樓梯其實只係狗瓦左既斜坡
你諗下與其上一條又短又斜既斜坡
不如上一條又長又冇咁斜既斜坡

如果慳力係代表可以行得更遠
咁好明顯逐級上係好過兩級上既
行過樓梯都會知
逐級上可以行到既層數
一定係多過兩級咁上

兩級上與其話係慳力不如話係快
但係只係響短程入面先會通用
因為人係會攰既

能量需要的多少,要視乎上樓時身體C.G.(重心)上下擺動的次數和幅度。主要是身體C.G所走的路線的長短。而兩種的P.E.都相同。

假設所需時間都相同的話,兩級兩級爬的路線比較直所以短,wok done以較小,所以省力d。

2008-10-26 16:41:36 補充：
身體動作所耗能量在這裏冇得計,所以忽略。

Neglecting friction, the energy spent in climbing the stair with [one step at a time] and [two step at a time] are the same, which is equal to the gain in potential energy. The time needed, is however, longer when the climbing is with [one step at a time]. Thus the power needed (power = energy/time interval) is less for this case. You therefore feel more easy and comfortable by climbing the stair with [ one step at time].

The above explanation is only based on physics principles. Biological factors would also have influence on one's feeling. The slower [one step at a time] climbing enables relatively less rapid respiration and less heat generated from the body, all these would add to one's feeling of comfortability.

跟據W=FS,人作出既動能在2個情況下都不變,所以2個用既力都係一樣!