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            第五章:動量守恒定律-2019年物理復習重點-福建成教

            福建成人高考信息網www.laiwobuy.com 發布時間: 2018年12月11日



                一、主要內容

              本章內容包括動量、沖量、反沖等基本概念和動量定理、動量守恒定律等基本規律。沖量是物體間相互作用一段時間的結果,動量是描述物體做機械運動時某一時刻的狀態量,物體受到沖量作用的結果,將導致物體動量的變化。沖量和動量都是矢量,它們的加、減運算都遵守矢量的平行四邊形法則。

              二、基本方法

              本章中所涉及到的基本方法主要是一維的矢量運算方法,其中包括動量定理的應用和動量守定律的應用,由于力和動量均為矢量。因此,在應用動理定理和動量守恒定律時要首先選取正方向,正規定的正方向一致的力或動量取正值,反之取負值而不能只關注力或動量數值的大小;另外,理論上講,只有在系統所受合外力為零的情況下系統的動量才守恒,但對于某些具體的動量守恒定律應用過程中,若系統所受的外力遠小于系統內部相互作用的內力,則也可視為系統的動量守恒,這是一種近似處理問題的方法。

              三、錯解分析

              在本章知識應用的過程中,初學者常犯的錯誤主要表現在:只注意力或動量的數值大小,而忽視力和動量的方向性,造成應用動量定理和動量守恒定律一列方程就出錯;對于動量守恒定律中各速度均為相對于地面的速度認識不清。對題目中所給出的速度值不加分析,盲目地套入公式,這也是一些學生常犯的錯誤。


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