圆周运动中的“物理最高点”和“物理最低点”

• 作 者: 石超 黄卫红
• 机 构: 江苏省扬州市邗江中学,
• 出 处: 数理化学习(高中版)
• 发表日期: 2015年11期
• 关键词: 圆周运动 重力场 最小速度 最大速度 匀强电场 一题多变 学生 位置 临界条件 教学 带电粒子 类比法 复合场 组成 题型 解题 教师 方法 变速

带电粒子在匀强电场和重力场组成的复合场中做变速圆周运动作为一种典型的题型,因涉及到圆周运动中的临界条件:最大速度、最小速度等,难度较高,学生不易掌握.教师在教学中通常会采用类比重力场的方法进行此类问题的教学,当涉及的问题较复杂时,学生采用类比法解题难度大,容易出错.笔者认为解决这类题关键就是如何找出圆周运动的“最高点”和“最低点”两个位置,以及分析这两个位置的速度的特点,即可轻松解决此类问题,笔者通过“一题多变”来阐述此类问题.

Charged particles in a uniform electric fields and gravitational field composite field to do variable speed circular motion as a typical type of question, due to the critical conditions involved in circular motion: maximum speed, minimum speed, etc., difficult, difficult to grasp the students Teachers often use the method of analog gravity field to teach teaching of such problems, when the problems involved are complex, the students are difficult to use analogy to solve problems, and the author believes that the key to solve these problems is how to find Out of the circular motion “highest point ” and “lowest point ” two positions, as well as the analysis of the characteristics of the speed of these two positions, you can easily solve such problems, I To illustrate such issues.