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推廣國際青年物理辯論競賽 (IYPT ) 成果融入 TEAL 大學普通物理及高中物理教學 - PowerPoint PPT Presentation

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推廣國際青年物理辯論競賽(IYPT)成果融入TEAL 大學普通物理及高中物理教學

• Kelvin's dropper (Problem 17, IYPT 2010):Construct Kelvin's dropper. Measure the highest voltage it can produce. Investigate its dependence on relevant parameters.
• Bubbles (Problem 8, IYPT 2012):

Is it possible to float on water when there are a large number of bubbles present? Study how the buoyancy of an object depends on the presence of bubbles.

• Gaussian cannon (Problem 1, IYPT 2012):

Sequence of identical steel balls includes a strong magnet and lies in a nonmagnetic channel. Another steel ball is rolled toward them and collides with the end ball. The ball at the opposite end of the sequence is ejected at a surprisingly high velocity. Optimize the magnet’s position for the greatest effect.

Gauss Gun 作為普物實驗教材

• 大綱:
• 現象觀察
• 模型(model)建立
• 速率控制
• 碰撞期間的動量與動能變化-不固定磁鐵
• 動量,能量對時間的變化
• 誤差來源:摩擦力的估計
• 碰撞期間的動量與動能變化-固定磁鐵
• 動量,能量對時間的變化
• 固定磁鐵:不同射入速率下射出速率的變化
• 固定磁鐵:變化鋼珠數目-最佳化
• 作為普物實驗教材的評估

(採用高速攝影和Tracker軟體進行測量)

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(open question,作為下一部研究的方向.)

• 劣勢:
• 磁距是有方向性,當鋼球有暫時性磁性,會產生數據上下跳動,會造成粗心者誤判.
• 要測量位能與位置的關係,或做更精細的測量,則需要高速錄影(>600張/秒).
• 優勢:
• 極易引起學生興趣.
• 現象複雜豐富,可以分成多個單獨實驗,或做普物課程的示範講解.
• 設備極其簡單,容易設置.Trackor軟體為免費.
• 若相機能做高速攝影,可利用Trackor做Data與影像間的觀察,更能教導學生觀察.尤其 Gauss Gun 有許多現象與角度有關.