| 机械能守恒演示中一个值得商榷的案例“悠悠球”系统能量损失分析 |
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| 引用本文： | 周雨青,刘甦.机械能守恒演示中一个值得商榷的案例“悠悠球”系统能量损失分析[J].大学物理,2011,30(8):18-21. |
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| 作者姓名： | 周雨青 刘甦 |
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| 作者单位： | 东南大学物理系,江苏南京,211189 |
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| 摘 要： | 指出“悠悠球”或“滚轮摆”在“下落”和“上升”两个独立阶段,机械能守恒,但在最低点的“转折”处,由于未加考虑系统突变效应而产生的能量损耗,导致错误地认为机械能不变.这个错误在教学中、课本里以及各种丛书中长期存在,应该引起重视.
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| 关 键 词： | 悠悠球(滚轮摆) 机械能守恒 转折点 刚性模型 |
A case open to question in demonstration of mechanical energy conservation |
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| ZHOU Yu-qing,LIU Su.A case open to question in demonstration of mechanical energy conservation[J].College Physics,2011,30(8):18-21. |
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| Authors: | ZHOU Yu-qing LIU Su |
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| Institution: | ZHOU Yu-qing,LIU Su(Department of Physics,Southeast University,Nanjing,Jiangsu 211189,China) |
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| Abstract: | The mechanical energy conservation in the two independent descending and ascending processes for a YO-YO or a rotating-wheel pendulum is pointed out,but it is false to consider that the mechanical energy stays the same at the turning point of its lowest position,because of ignoring the energy loss caused by system jump effect.This mistake has long been existed in teaching,textbooks and all kinds of other books,worthy of being brought to the forefront. |
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| Keywords: | YO-YO(rotating-wheel pendulum) mechanical energy conservation turning point rigid model |
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