华东地区教材编写组编写的初中物理第二册第86页图20—21所示的实验是一个验证物体被举得越高,质量越大,它具有的重力势能越多的实验。笔者按课本上的方法进行实验时,发现松手时重物往往不能准确地落在木桩上,我作了如下改进,效果要好得多。 The experiment shown in Figure 20-21 of the second edition of junior middle school physics textbook compilation team of East China is an experiment to verify that the higher the object is lifted, the greater the mass, and the more gravitational potential energy it has. When the author carried out the experiment according to the textbook method, he found that the heavy objects could not be accurately placed on the stakes when they let go. I made the following improvements and the effect was much better.