运用逆思维方法解题

• 作 者: 禤桃光
• 机 构: 广西柳州市第八中学,
• 出 处: 物理教学
• 发表日期: 1993年06期
• 关键词: 思维方法 匀速行驶 解题思路 凸透镜成像规律 高考题 关闭发动机 点光源 副焦点 光心 处石

一般地说,多数人肯按照顺思维方法去考虑解决问题,较少运用逆思维方法去思考解决问题。但是,有些问题,运用常规的方法解决显得较繁琐,而运用逆思维方法解决却显得简捷明快。例1 总质量为 M 的列车,在平直轨道上匀速行驶,尾部有一节质量为 m 的车厢突然脱钩,当司机发现时,列车前部已行驶到距离脱钩处 L 的地方。于是司机

In general, most people are willing to consider solving problems in a straightforward way and less to use reverse thinking to think about solving problems. However, some problems are more tedious to solve with conventional methods, and the use of counter-thinking methods is simple and straightforward. Example 1 The train with a total mass of M traveled at a constant speed on a straight track. At the rear, there was a car with a mass m suddenly unhooking. When the driver found out, the front of the train had traveled to a place away from the hook L. So the driver