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同学们都有这样的经验:背起书包,我们的肩膀就感受到了肩带的压迫.如果不能减轻书包的质量,换用宽肩带的书包会让我们感到轻松.小小的蚊子应该没有多大力气,但它的口器却可以在我们难以觉察的情况下,轻松地刺破我们的皮肤!我们的肩膀感觉是否轻松,皮肤是否能被物体穿透,都可以看作是压力的作用效果.可见压力的作用效果不但与压力的大小有关,还与接触面积有关,什么是压强实验证实,压力的作用效果与压力的大小及物体的受力面积有关,为了表示压力的
Students have the experience of wearing a bag, we feel the shoulder strap on the shoulder of oppression.If you can not alleviate the quality of the bag, change the bag with a wide shoulder strap will make us feel relaxed.Minute mosquitoes should not much However, its mouthpiece can easily pierce our skin under our imperceptible condition! Whether our shoulders feel relaxed and whether the skin can be penetrated by an object can be regarded as the effect of stress. The effect of pressure can be seen not only with the size of the pressure, but also with the contact area, what is the pressure test confirmed that the effect of the pressure and the size of the pressure and the affected area of the object, in order to show the pressure