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物理教学中的某些问题既可以用比较复杂的数学知识求解,也可以依据基本物理原理以较为简单的方法解决,这时我们应该如何取舍呢?为了让大家对此感同身受,先看下面两个实例。实例1:(2005年北京理综第24题)真空中存在空间范围足够大、水平向右的匀强电场。在电场中,若将一个质量为m、带正电的小球由静止释放,运动中小球的速度与竖直方向夹角为37°(取sin37°=0.6,cos37°=0.8)。现将该小球从电场中某点以初速度v0竖
Some problems in physics teaching can not only be solved by more complicated mathematical knowledge, but also can be solved by simpler methods according to the basic physical principles. At this time, how should we choose? In order to make people feel empathy, let’s look at the following two Instance. Example 1: (Beijing Science and Technology in 2005, No. 24) There is a vacuum in the vacuum range is large enough, horizontal uniform right strong electric field. In an electric field, if a mass of m, positively charged balls are released at rest, the angle between the speed of the moving ball and the vertical direction is 37 ° (taking sin37 ° = 0.6, cos37 ° = 0.8). Now the ball from the electric field in a certain point to the initial velocity v0 vertical