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一、正确理解“功”的概念1.概念的引入。通过滑轮的学习,大家知道,在理想状态下(即不考虑动滑轮和绳子重力以及一切摩擦)的情况下,动滑轮可以省一半的力,但移动的距离s是物体上升高度h的2倍,这时我们发现拉力F与上升的距离s相乘等于物重G与物体上升高度h的乘积,即Fs=Gh。并且使用其他机械也是如此。由此我们发现,力和物体在力的方向上移动距离的乘积,是一个有意
First, the correct understanding of the concept of “work” 1. The introduction of concepts. Through the learning of the pulley, we all know that in the ideal condition (ie, regardless of the gravity of the moving pulley and the rope and all the friction), the moving pulley can save half the force, but the moving distance s is twice the height h of the object. We found that the multiplication of the tension force F by the distance s is equal to the product of the mass G and the height h of the object, ie Fs=Gh. And it’s the same with other machines. From this we find that the product of the force and the moving distance of the object in the direction of force is an intentional one.