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在处理力学问题时,首先要解决的就是对相互作用中相关力的分析,尤其是力的方向和作用效果.以下,是笔者对在教学过程中发现的学生在练习中容易犯错的几个例题的分析和总结.【例1】下列四图中物体重心位置一直降低的是()A.将竖立的砖头B.水从玻璃杯底部推倒的过程的小孔流出的过程C.跳台跳水运动D.将天花板下悬挂员跳水的过程的铁链下端用手往下拉的过程易错分析:错选B的原因,(1)对决定物体重心位置的因素掌握不牢;(2)没有注意到容器
In dealing with mechanical problems, the first thing to be solved is to analyze the relevant forces in the interaction, especially the force direction and the effect of the following is the author of the teaching process found in the practice of a few mistakes in a few examples [Example 1] The following four figure is the center of gravity of the object has been reduced () A. The erection of the bricks B. Water from the bottom of the glass process of pushing the hole out of the process C. Diving D . The process of hanging under the ceiling of the process of diving down the chain by hand down the process of error-prone analysis: the reason for the wrong B, (1) determine the location of the object center of gravity of the factors not firmly grasp; (2) did not notice the container