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九年义务教材华东版初中物理第二册课本第86页中的演示实验:影响物体重力势能因素的演示.该实验看似简单,但在课堂上实际演示却并非如此,主要困难是重物下落击中木桩顶部的位置难以掌握、重物击中木桩后去向难以控制,导致木桩被击后极易倾斜或被击倒,从而大大影响了演示效果.
Nine-year compulsory textbooks Demonstration experiment on page 86 of the second edition of the textbook for the junior high school physics textbooks for East China Edition: Demonstration of factors that influence the gravitational potential energy of the object. The experiment may seem simple, but the actual demonstration in the classroom is not the case. The main difficulty is the drop of heavy objects. The position of hitting the top of the stake is difficult to grasp, and the heavy object hits the stake and is difficult to control. As a result, the stake is easily tilted or knocked down, which greatly affects the demonstration effect.