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作杠杆上的“最小力”是对杠杆平衡条件的应用,是考察学生思维能力的好题,近几年中考中这样的题目频频出现,通过自己的教学实践,对解决这类问题的方法进行分析归纳.一、动力作用点固定时的最小力例1如图1所示,在A点作出使杠杆平衡的最小力的示意图.
Leverage on the “minimum force” is the application of the lever balance conditions, is to examine the thinking ability of students a good question, in recent years in the middle of the exam in such topics frequently appear, through their own teaching practice, to solve these problems Method to analyze and summarize.A minimum force when the dynamic point is fixed as shown in Figure 1, at the A point to make a lever to balance the minimum force diagram.