Crazy stick 魔棒
這是Advance Level 物理課程中有提及的一種物理現象, 利薩如圖形 (Lissajous' Figures) , 此現象由兩種相互垂直的振動而合成.當魔棒略向下傾斜, 這時棒頂旋翼靜止在小釘上, 用小棒輕怏地磨擦有槽的大棒, 同時用食指與大棒接觸, 旋翼將向左旋轉; 若在小棒磨擦時保持大拇指與大棒接觸, 旋翼將向右旋轉, 旋翼旋轉的原理在於小釘同時參與了大棒的兩種相互垂直的振動, 結合成為作圓週運動.
Basic on Physics theory (Lissajous' Figures), crazy stick motion due to interaction of cross resonance and vibration , then a small fan at the back of stick will turn very fast. Have practice for a while , you can do it.
Item no : JHL 675