共振之科普通識教學－單擺與節拍器運用

Teaching the Concept of Resonance by Using Metronomes with Coupled Pendulums in Popular Sciences & General Education

陳怡妗(Yi Jinn, Lillian Chen) ； 王碩宏(Shuo-Hong Wang) ； 董元銘(Yuan-Ming Dong) ； 利見興(Jiann-Shing Lih) ； 陳姿君(Tzu-Chun Chen) ； 洪振方(Jeng-Fung Hung) ； 柯景元(Jing-Yuan Ko)

《物理教育學刊》 24卷1期 (2023/07) Pp. 15-26

https://doi.org/10.6212/CPE.202307_24(1).0002

摘要

當一個物體的強迫振動頻率符合它的固有頻率時，振幅就會越來越增加，此為共振現象。共振原理用文字很難理解，老師在課堂上用盪鞦韆的影片來解釋共振，一般學生認為越用力推鞦韆可以讓鞦韆盪得越高，然而影片中隨意推鞦韆，縱使用力推也無法讓鞦韆推得高，視覺上的刺激讓學生認識了共振現象。為了讓學生體驗共振，設計一科普探究與實作課程，從鞦韆共振、音叉共振、兩把吉他出演示共振，一把吉他彈一琴弦，面對面的另一把吉他的琴弦隔空呼應震動起來等搭配影片及原理解說。最後於課堂上利用一個節拍器與一組連結的單擺系統的設計，做一個共振系統的實作，讓學生動手找到與節拍器共振之單擺，嘗試解說共振原理。

關鍵字

共振 ； 節拍器 ； 單擺 ； 鞦韆 ； 音叉

並列摘要

When a forced vibration frequency of an object matches or equals its natural frequency, amplitude dramatically increases. The phenomenon is called resonance. Resonance is difficult to be explained literally. Students thought the harder they pushed the swing, the higher it could be. A teacher used a video of swings to teach resonance in class. In the video, when the swing was pushed hard randomly, the swing did not swing high. The visual stimulation lets students understand the phenomenon of resonance. In order to help students to experience resonance, a popular science exploration and practice course is designed. Many demonstrations, such as swing resonance, tuning fork resonance, and two guitars resonated, are introduced with videos and theories explanations. Finally, in class, a metronome and coupled pendulums were designed to implement a resonance practice, which allowed students to find out coupled pendulums that resonated with the frequency of the metronome and try to explain the theories of resonance.

並列關鍵字

Resonance ； Metronome ； Pendulum ； Swing ； Tunning Fork