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在课堂演示实验中,缩短辅助性活动的时间,提高效率,也是很重要的。我在《单摆振动的周期》一节实验中,采用自制的悬点支座,使用方便,可信度高,使实验的调整、变换过程简捷、迅速。自制的悬点支座(见图一)用日光灯启动器的铝质外壳,在其侧壁开口沿径向直通底面圆心止。用铁架台十字夹固定支座(支座开口平面与单摆振动平面垂直),将两个大小相同质量不等的摆球(注)系在同一条约1米长的细线两端。实验时将两球中的任意一球放入支座内,细线沿开口处
In classroom demonstration experiments, it is also important to shorten the time for supporting activities and improve efficiency. In the experiment of “single pendulum vibration cycle”, I used the self-made hanging point bearing, which is convenient to use and has high credibility, which makes the experiment adjustment and transformation process simple and rapid. The self-made hanging point holder (see Fig. 1) uses the aluminum housing of the fluorescent lamp starter and passes through the opening of the side wall to pass through the center of the bottom of the base in the radial direction. Fix the support with a metal frame cross clamp (the plane of the opening of the support is perpendicular to the vibration plane of the single pendulum), and place two pendulum balls (notes) of the same size and mass on the two ends of the thin wire 1 meter long. During the experiment, place any of the two balls into the holder, along the opening