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題名 | 質心運動演示教具=A Teaching Instrument for Demonstrating the Motion of Center of Mass |
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作 者 | 周鑑恆; | 書刊名 | 物理教育學刊 |
卷期 | 12:1 2011.07[民100.07] |
頁次 | 頁73-77 |
分類號 | 332.2 |
關鍵詞 | 質心; 拋物線; 重力; Center of mass; Parabola; Gravity; |
語文 | 中文(Chinese) |
中文摘要 | 嚴格而言,牛頓第二定律,原是單一質點運動時所遵守的規律,但在日常 生活中和各種工程領域中面臨的課題,卻是有尺寸大小和形狀的物體之運動,而 物體可視為由許多質點構成的質點系統,將牛頓第二運動定律應用於計算質點系 統之運動,不難得出相當簡潔的結果。牛頓運動定律推導出的結果顯示,在地表 附近拋出一個物體,這個物體當然受到重力,若忽略空氣阻力,即便此物體會翻 轉,它質心運動的軌跡是一條簡單的拋物線。作者創作一項教具,可生動演示出 這令人驚奇的現象。 |
英文摘要 | Strictly speaking, Newton's second law was originally applied to a single-particle motion, but in daily life and various engineering fields we have to deal with the objects with different shapes and sizes. The objects can be viewed as consisting of particles. After we apply Newton's second law to each particle of the object, it is not difficult to draw a very simple result. Newton's laws along with related calculations show following interesting conclusion: An object is thrown near the surface of the earth and the object of course is subject to gravity. If air resistance is ignored, the trajectory of its center of mass is a simple parabola. Author designs and makes a teaching instrument which can vividly demonstrate this surprising phenomenon about the trajectory of the center of mass. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。