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重點整理: 碰撞

在此單元可說以多質點系統的碰撞問題把之前關於動力現象所學的牛頓運動定律(動量守恆定律)以及功能定理(力學能守恆)綜合應用.
基本概念在於(1)系統不受外力時,系統的總動量守恆   (2)獨立系統 外力不作功,內力為保守力時力學能守恆.
由此先處理1.彈性碰撞 (同時遵守總動量守恆與力學能守恆),其中一維彈性碰撞可歸納出碰撞前後的特性
                    2.非彈性碰撞(動量守恆,力學能不守恆),其中以完全非彈性碰撞,碰後成合體為代表

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