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用一根吃饭的筷子(或直杆)A,固定在铁架台十字头上将长25厘米左右的细线B的两端固定在筷子上,挎度20厘米左右,线不要崩得过紧,中间有2厘米左右高的弧状,用两个直径2厘米左右的,等质量单摆钢球(无孔球用锡焊上大头针系线),摆长(历厘米左右)要相等,分别系于距线两端7厘米处即成,如附图所示。实验时,二球静止后,将一球在横筷垂直方向偏开60°角左右自由释放,即可看到有趣的,间歇,交换振动。特点:定能引起学生兴趣,并自然地诱导其思维,提出一个为什么?
Use a chopstick (or straight bar) A to fasten the ends of the thin wire B about 25 centimeters long on the crosshead of the iron frame and fix it on the chopsticks. The twist should be about 20 centimeters. The wire should not collapse too tightly. There is an arc of 2 centimeters high in the middle, with two diameters of about 2 centimeters, and the mass of the pendulum ball (with no holes on the ball soldered with pins), the pendulum length (about centimeters in length) should be equal, respectively 7 cm from both ends of the line, as shown in the figure. During the experiment, after the two balls are at rest, a ball is released freely around the angle of 60° in the vertical direction of the horizontal chopsticks, and you can see interesting, intermittent, and exchanged vibrations. Features: Will definitely arouse students’ interest and naturally induce their thinking, and why?