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            知識點:圓周運動-2019年物理復習資料-福建函授專科

            福建成人高考信息網www.laiwobuy.com 發布時間: 2018年12月05日

            知識點:圓周運動-2019年物理復習資料-福建函授專科


                一、主要內容

              本章內容包括圓周運動的動力學部分和物體做圓周運動的能量問題,其核心內容是牛頓第二定律、機械能守恒定律等知識在圓周運動中的具體應用。

              二、基本方法

              本章中所涉及到的基本方法與第二章牛頓定律的方法基本相同,只是在具體應用知識的過程中要注意結合圓周運動的特點:物體所受外力在沿半徑指向圓心的合力才是物體做圓周運動的向心力,因此利用矢量合成的方法分析物體的受力情況同樣也是本章的基本方法;只有物體所受的合外力的方向沿半徑指向圓心,物體才做勻速圓周運動。根據牛頓第二定律合外力與加速度的瞬時關系可知,當物體在圓周上運動的某一瞬間的合外力指向圓心,我們仍可以用牛頓第二定律對這一時刻列出相應的牛頓定律的方程,如豎直圓周運動的最高點和最低點的問題。另外,由于在具體的圓周運動中,物體所受除重力以外的合外力總指向圓心,與物體的運動方向垂直,因此向心力對物體不做功,所以物體的機械能守恒。

              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:對物體做圓周運動時的受力情況不能做出正確的分析,特別是物體在水平面內做圓周運動,靜摩擦力參與提供向心力的情況;對牛頓運動定律、圓周運動的規律及機械能守恒定律等知識內容不能綜合地靈活應用,如對于被繩(或桿、軌道)束縛的物體在豎直面的圓周運動問題,由于涉及到多方面知識的綜合,表現出解答問題時顧此失彼。


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