运用所学知识解决实际问题是物理学习的目的之一.在教学活动中,学生经常感到虽然已经学懂了教材中的概念和规律,但在解题时又常觉得束手无策,或一解就错,究其主要原因还是对所学知识没能够全面、深入地理解,没达到 The use of what is learned to solve practical problems is one of the purposes of physics learning. In teaching activities, students often feel that although they have learned the concepts and laws of textbooks, they often feel helpless when solving problems, or they are wrong when they solve problems. The main reason for this is that we have not been able to fully and deeply understand the knowledge we have learned.