你敢躺在一张布满钉子的“床”上吗?在这张床上密密麻麻排满了七千多个小孔,每个孔里都会钻出一颗尖锐的不锈钢钢钉,这可是一张名副其实的“钉床”哦!也许你的第一直觉会担心躺在上面身体一定会被扎破,其实这张床并没有那么可怕。当你全身放松地躺在钉床上时,慢慢上升的钉子会把你的身体托起来,尽管钉子是真的“扎”在了身上,但你是不会感到疼痛的。这是为什么呢?想想我们课本中的压力、压强、受力面积,你是不是会受到启发?压力指垂直作用于物体表面上的 Do you dare lie on a bed full of nails? There are over 7,000 holes in this bed, and a sharp stainless steel nail drilled into each hole, A veritable “nailed bed ” Oh! Maybe your first instinct will be worried lying on the body will be punctured, in fact, this bed is not so terrible. As you relax loosely on a bed of nails, a slowly rising nail will hold your body up, even though the nail is real, but you will not feel any pain. Why is this? Think of our textbooks in the pressure, pressure, stress area, you are not inspired? Pressure refers to the vertical surface on the object