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有一句名言:给我一个支点,我就能够撬起整个地球,这就是物理杠杆的重要作用。物理杠杆原理在日常生活、工作中时常被应用,例如大型吊车、天平等。研究物理杠杆原理及其应用有着十分重要的现实意义。一、杠杆原理概述中学物理中将一根经力作用能够绕固定点转动的硬棒称为杠杆。如图1所示,支点、动力、阻力以及动力臂、阻力臂构成了杠杆的五大要素,其中支点指的是杠杆围绕转动的点,通常用字母O表示;动力指的是使杠杆转动的作用力,通常用F_1表示;阻力指的
There is a saying: Give me a fulcrum, I can pry the entire earth, this is the important role of physical leverage. Physical lever principle in daily life, work is often used, such as large cranes, balance and so on. It is very important to study the principle of physical lever and its application. First, an overview of the principle of high school physics will be a force acting around the fixed point of rotation called hard bar. As shown in Fig. 1, the fulcrum, motive force, resistance, and power arm and resistance arm constitute the five elements of the lever, where the fulcrum refers to the point around which the lever pivots, usually indicated by the letter O. Power refers to the action of turning the lever Force, usually F_1; resistance means