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演示实验的成功与否,直接影响一堂课的教学效果,对于那些不经推导而直接根据实验结果得出规律性结论的内容更是这样,高二物理受迫振动一节就是属于这种情况。我们按教科书图8-21进行演示,实验总是不成功。后来研究了失败的原因,主要有二点:(1)振子除上下振动外,还会发生前后左右摆动;(2)由于空气阻力(与弹簧弹力相比)很小,受迫振动要经过一段很长时间才能达到稳定状态。根据理论力学的推
Demonstration of the success of the experiment directly affects the teaching effect of one class. This is especially true for those contents that have not been deduced and based on the experimental results to draw regular conclusions. We demonstrate by textbook Figure 8-21 that the experiment was always unsuccessful. Later, the cause of the failure was studied. There are two main points: (1) In addition to vibrating up and down, the vibrator also swings back and forth; (2) As the air resistance (compared to the spring force) is very small, the forced vibration goes through a period of time. It takes a long time to reach steady state. Push based on theoretical mechanics