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我们在指导学生做高中乙种本“验证机械能守恒定律”的实验时,常发现这个实验误差很大,甚至有的学生得到实验的结果是增加的动能大于减少的重力势能,即1/2mv~2>mgh,这既不合理也达不到证明“守恒”之目的。经研究,我们认为教科书上用来计算即时速度的公式v=gf是与实验实际情况不相
When we were instructing students to do the experiment of “verifying the conservation of mechanical energy” by the senior high school students, we often found that this experiment was very inaccurate. Even some students obtained the result of the experiment that the increased kinetic energy was greater than the reduced gravitational potential energy, ie 1/2mv~ 2>mgh, this is neither reasonable nor sufficient to prove “conservation”. After research, we believe that the formula v=gf used to calculate the instantaneous speed in textbooks is not comparable to the actual situation in the experiment.