近几年来各地的中考和竞赛试题中出现了许多新题型,开放性题型就是其中的一种.所谓“开放性”,是针对“封闭性”而言的.传统的物理题目大多是条件齐全,结果确定,解题思路和方法比较单一,要求同学们根据题目给出的条件,运用有关规律、公式找出确定的答案即可. In recent years, there have been many new types of questions in the examinations and competition examinations around the country. Open questions are one of them. The so-called “openness” is in terms of “closedness.” Traditional physics topics are mostly conditions. Complete, the result is determined, and the problem-solving ideas and methods are relatively simple. Students are required to use the relevant laws and formulas to find out the definite answers according to the conditions given by the topic.