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在现行高中物理教材(必修加选修)第二册第九章第三、四节中简谐运动图像的描绘采用了先描点法,再用单摆漏沙法由沙迹进一步说明x-t按正弦或余弦规律变化.但这样存在着明显的不足和不便:首先,偏角不超过10°,难以控制且振幅太小、不易观察;其次,沙漏中单摆的等效摆长在不断变化,
In the current high school physics textbook (required for optional addition), Book 2 Chapters 3 and 4 of the second chapter, the description of the simple harmonic motion image adopts the first sketching method, and then the single pendulum sandfall method is used to further illustrate the xt sine or the sand trace. The cosine law changes. However, there are obvious deficiencies and inconveniences. First, the declination does not exceed 10°, and it is difficult to control and the amplitude is too small to be observed. Second, the equivalent pendulum length of the pendulum in the hourglass is constantly changing.