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在物理解题中,由于学生常常对题意的理解不深刻,缺乏全面的分析,忽视了一些公式、结论的适用条件,常常误入歧途,使学生上当错解题目,本文就力学中常见的几个上当解法进行剖析,指出其症结所在。 1.错用解题结论 例1.质量为M的人抓住长L的轻绳一端.绳的另一端系着质量为m的小球,现让小球在竖直平面内做圆周运动,当球通过最高点时速率为v,则(1)当球通过最低点和最高点时球对绳的拉力之差为____;(2)当球通过最低点和最高点时,人对地面
In the matter understanding problem, because students often do not understand the meaning of the question deeply, and lack comprehensive analysis, neglecting the application conditions of some formulas and conclusions, they often go astray and make students misunderstand the problem. This article is common in mechanics. A few of the Dangdang solutions were analyzed and pointed out the crux of the problem. 1. Misuse of Problem Solving Example 1. A person of mass M grasps the end of the light rope of Long L. The other end of the rope is tied to a ball of mass m. Now let the ball make a circular motion in the vertical plane. When the ball passes through the highest point and the velocity is v, then (1) the difference between the ball and the rope when the ball passes through the lowest point and the highest point is ____; (2) When the ball passes through the lowest point and the highest point, the person is on the ground