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在高中《物理》(必修)第一册第131面学生实验二“验证力的平行四边形定则”进行教学的过程中,发现很多学生在实验最后只做出一个含有对角线的平行四边形图示,没有做出合力 F′的图示.经过分析,是教材表述存在一些问题才使学生产生上述错误.下面是教材实验中的几个主要步骤:(3)用两个弹簧秤分别勾住绳套,互成角度地拉橡皮条,使橡皮条伸长,结点到达某一位置 O.(4)用铅笔记下 O 点的位置和两条细绳的方向,读出两个
In the process of teaching high school students “Physics” (required) in the 131st side of the first volume of the student’s experiment II “the parallelogram rule of the verification force”, it was found that many students only made a parallel with the diagonal at the end of the experiment. The quadrilateral graphic shows no illustration of the resultant force F’. After analysis, there are some problems in the teaching material to make the students make the above mistakes. The following are the main steps in the teaching experiment: (3) Use two spring balances to check separately. Hold the rope sleeves and pull the rubber strips at an angle to each other to make the rubber strips stretch. The knots reach a certain position O. (4) Use a pencil to record the position of the O point and the direction of the two cords. Read out the two.