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在初中物理中求解功的问题有多种方法,这就需要我们灵活地运用相关的知识.下面举例说明,希望对于拓展同学们的解题思路,提高解题技能和技巧能够有所帮助.一、根据功的定义公式W=Fs求解例1重50 N的物体分别在下列各种情况下,外力做了多少功?(1)用30 N的竖直向上的力提物体;(2)物体沿光滑平面匀速移动3 m;(3)用30 N的力拉物体沿光滑平面移动了3 m.解析:对于上述问题须紧紧抓住做功的两根必要条件进行分析.
There are many ways to solve the problem of work in physics in junior high school, which requires us to flexibly use the relevant knowledge.Examples below, I hope to expand the students’ problem solving ideas to improve the skills and skills to solve problems can help. , According to the definition formula of work W = Fs Solution Example 1 The object of 50N weight How much work does the external force do in each of the following situations? (1) Use 30N vertical upward force to lift object; (2) Object Move 3m along the smooth plane at a constant speed; (3) Pull the object 3m along the smooth plane with a force of 30 N. Analyze: For the above problems, we must grasp the two necessary conditions for work.