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学生学完电场后,经常会遇到带电小球在重力场和电场叠加的复合场中的运动的问题。在教学过程中,学生对带电小球在复合场的圆周运动存在较多问题,现对这类问题做简单的讨论。一、物体只受重力小球通过细绳连接在竖直面内做圆周运动,此过程我们经常提到“最高点”和“最低点”。如图1,最高点和最低点可以这样来认识:从圆心沿重力或g的方向做一条射线与圆轨迹的交点b为最低点,反向延长线与轨迹的交点a为最高点。(注:最低点还有多种认识:如
Students learn the electric field, often encounter the charged ball in the gravity field and electric field superimposed complex field motion problems. In the process of teaching, students have many problems on the circular motion of the charged pellet in the compound field. Now, this kind of problem is briefly discussed. First, the object is only gravity ball connected by a thin rope in the vertical plane to do circular motion, this process we often refer to “highest point ” and “lowest point ”. As shown in Figure 1, the highest point and the lowest point can be recognized as follows: from the center of gravity along the direction of gravity or g, a ray intersects the circular locus b is the lowest point, and the intersection of the backward extending line and the locus a is the highest point. (Note: the lowest point there are many kinds of knowledge: such as