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在讲“简谐振动”的规律之前,为了说明:“任一简谐振动的质点,都可以设想是其参考圆上作匀速圆周运动的质点在直径上的投影点的运动。”课本是通过弹簧振子,和一个作匀速圆周运动质点的投影的“重影”实验来引入参考圆的、因此做好“重影”实验,就是为振动规律的讲授,垫好了一块基石,那么怎样才能做好“重影”实验呢? (一)要尽可能地把二振动的频率调得低些,要使学生能清楚地分辨出,二投影点在振动过程中,重影得如何?为此,我们采用了电唱机的转盘,在上面放一张废唱片,在唱片上靠边的地方,固定一个乒乓球,并将转速调至 33转/分,周期在1.8秒左右(见图 2)。 (二)要把二振动的周期调的相等。就是
Before describing the principle of “harmonic vibration,” in order to illustrate: “Any particle of simple harmonic vibration can be assumed to be the motion of a point of diameter of a point of uniform circular motion on the reference circle.” “The textbook introduces the reference circle through the spring oscillator and a ”ghosting“ experiment that performs the projection of the uniform velocity of the circular motion, so do a good ”ghosting“ experiment, which is to teach the vibration rule, A cornerstone, then how can we do a good ”ghosting" experiment? (A) To make the frequency of the two vibrations as low as possible, so that students can clearly distinguish, two projection points in the vibration process In the middle, how is the double shadow? For this, we used the turntable of a record player, placed a disc on it, fixed a table tennis ball on the side of the disc, and adjusted the speed to 33 rpm. The cycle was 1.8. Seconds or so (see Figure 2). (b) It is necessary to equalize the period of the two vibrations. Is