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高中物理教材从试用本到现在的甲、乙种本,圆周运动部分都是作为牛顿第二定律在曲线运动中的应用来安排的。然而仔细揣摩,这样的安排是否妥当,尚有值得商榷之处。一、问题的提出多年的教学实践表明,对于匀速圆周运动的动力学描述 F=m(v~2/r)(或mω~2r),学生始终感到难以理解与接受。不少学生直至高三仍搞不清公式 F=m(v~2/r)的真正由来。笔者曾在高一、高二各四个班中进行调查,结果多数学生对上式感到困惑不解。产生上述理解上思维障碍的原因何在?我们认为除了一些其它因素外,可能跟目前教材编写的指导思想不无关系。
High school physics textbooks from the trial to the present A, B species, circular motion part is arranged as a Newton second law in the application of the curve movement. However, careful consideration of whether such an arrangement is appropriate is still worth discussing. First, the problem of the proposed teaching practice for many years shows that the dynamic description of the uniform circular motion F = m (v ~ 2 / r) (or mω ~ 2r), the students always feel difficult to understand and accept. Many students still do not understand the true origin of the formula F=m(v~2/r) until the third year. The author conducted surveys in each of the four classes in the first and second grades. As a result, most students were puzzled by the above formula. What is the reason for the above-mentioned thinking barriers in understanding? We think that besides some other factors, it may be related to the guiding ideology of current textbook compilation.