论文部分内容阅读
利用逆向思维分析和解决物理问题,可以开拓学生的思路,简化解题过程,提高学生分析能力。现举例如下。一、利用运动形式的可逆性解题例1.一个竖直上抛运动的物体,到达最高点的最后1秒内上升的高度是它上升的最大高度的1/5,试求它上升的最大高度。解:按照逆向思维,应该意识到上抛运动的上升阶段与自由落体运动互为可逆,这样,竖直上抛运动到达最大高度前的最后1秒内上升的高度,恰好是自由落体最初1秒内下落的高度。设所求最大高度为h_m,故:
Using reverse thinking to analyze and solve physical problems can open up students’ ideas, simplify the problem-solving process, and improve students’ analytical skills. Examples are as follows. First, the use of the form of reversibility of the movement to solve problems Example 1. A vertical throwing motion of the object, to the highest point of the last 1 second rise is the height of its maximum height of 1 / 5, try to find it the largest increase height. Solution: According to the reverse thinking, it should be realized that the ascending phase of the throwing movement and the free fall movement are mutually reversible. In this way, the height that rises in the last 1 second before the vertical throwing motion reaches the maximum height is exactly the first 1 second of the free fall. The height of the drop. Set the maximum height to be h_m, so: