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            第六章:振動與振幅-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14日


                一、主要內容

              本章內容包括機械振動、回復力、振幅、周期、頻率、簡諧振動、受迫振動、共振、機械波、波長、波速、橫波、縱波、波的干涉和衍射等基本概念,以及單擺振動的周期規律、簡諧運動的圖像、簡諧運動中的能量轉化規律、波的圖像、波長和頻率與波速之間的關系等規律。

              二、基本方法

              本章中所涉及到的基本方法有:由于振動和波動的運動規律較為復雜,且限于中學數學知識的水平,因此對于這部分內容不可能像研究直線運動、平拋、圓周運動那樣從運動方向出發描述和研究物體的運動,而是利用圖象法對物體做簡諧運動的運動規律及振動在介媒中的傳播過程進行描述與研究。圖像法具有形象、直觀等優點,其中包含有豐富的物理信息,在學習時同學們要注意加以體會;另外,在研究單擺振動的過程中,對于單擺所受的回復力特點的分析,采取了小擺角的近似的處理,這是一種理想化物理過程的方法。

              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:對于諸如機械振動、簡諧運動、受迫振動、共振、阻尼振動、等幅振動等眾多的有關振動的概念不能深刻的理解,從而造成混淆;不能從本質上把握振動圖象和波的圖象的區別和聯系,這主要是由于振動的圖象與波的圖象形式上非常相似,一些學生只注意圖象的形狀,而忽略了圖象中坐標軸所表示的物理意義,因此造成了將兩個圖象相混淆。另外,由于一些學生對波的形成過程理解不夠深刻,導致對于波在傳播過程中時間和空間的周期性不能真正的理解和把握;由于干涉和衍射的發生條件、產生的現象較為抽象,所以一些學生不能準確地把握相關的知識內容,表現為抓不住現象的主要特征、產生的條件混淆不清。


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