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人教版高中地理必修1自然地理環(huán)境的整體性教案

  • 新人教版高中英語必修1Welcome Unit-Reading and Thinking教案

    新人教版高中英語必修1Welcome Unit-Reading and Thinking教案

    Step 2 New WordsUse ppt to show some words from the passage.Tell the students to remember the meanings.Step3 Skimming and Thinking1. Skim the text and decide which order Han Jing follows to talk about her first day. Time order or place order?Time order2. What is Han Jing worried about before she goes to senior high school?She is worried about whether she will make new friends and if no one talks to her, what she should do.Step 4 Fast Reading1. Match the main ideas with each paragraphParagraph 1:The worries about the new school day Paragraph 2Han Jing’s first maths classParagraph 3Han Jing’s first chemistry classParagraph 4Han Jing’s feelings about her first senior school dayStep 5 Careful Reading1. Fill in the chart with the words and phrases about Han Jing’s day. Answers: Senior high school, a little nervous; Her first maths class, classmates and teachers, friendly and helpful; Chemistry lab; new; great; annoying guy; Confident; a lot to explore2. Read the text again and discuss the questions.1) Why did Han Jing feel anxious before school?Because she was a new senior high student and she was not outgoing. What was more, she was worried about whether she can make friends.2) How was her first maths class?It was difficult but the teacher was kind and friendly. 3) What happened in the chemistry class? What would you do if this happened to you? A guy next to Han Jing tried to talk with her and she couldn’t concentrate on the experiment.

  • 新人教版高中英語必修1Welcome Unit-Reading for Writing教案

    新人教版高中英語必修1Welcome Unit-Reading for Writing教案

    教學目標知識目標:讓學生更好理解如何恰當?shù)貙懸粋€人的信息介紹,并能讓學生熟練地使用一些寫作技能。能力目標:培養(yǎng)學生的寫作能力和團隊協(xié)作能力。情感目標:提升學生對寫作的興趣。教學重難點 教學重點:如何能讓學生更好地理解個人信息介紹。教學難點:如何能讓學生通過適當?shù)厥褂靡恍懽骷寄軄韺懸黄^好的個人信息介紹。教學準備 多媒體、黑板、粉筆一、Pre-class1. Greetings2. Leading-inAsk students how to write a profile. What kinds of aspects should be included? The teacher asks students to discuss the topic with each other and put forward to much more ideas about the answer.二、While-class1. The teacher lets students to read the student profiles on Page 8 silently and then asks students to discuss the questions below.1. What is Ann like? How do you know?2. What are Thando’s hobbies?3. Where does Thando come from?4. What is Thando’s dream?5. What does “You will never see me without a book or a pen” mean?

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案二

    新人教版高中英語必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案二

    This theme of the part is “ Describe people or things in greater detail”. Students have learned the grammar(restrictive relative clauses) in Book 1, and further review and consolidate its structure “prep+relative pronouns(which/whom)” and the relative adverbs(when, where and why), besides students should understand its form, meaning and functions. In this section, students should be able to express the grammar correctly in daily communication and in the writing. 1. Review the basic usages of relative pronouns and adverbs of attributive clauses . 2. Learn to use some special cases about restrictive relative clauses.3. Learn to write sentences with restrictive relative clauses flexibly according to the context.1. Review the basic usages of relative pronouns and adverbs of attributive clauses .2. Learn to use some special cases about restrictive relative clauses.3. Learn tow rite sentences with restrictive relative clauses flexibly according to the context.Step 1. Observe the following sentences, and mark the relative pronouns and the adverbs. 1. After listening to the scientists who had studied the problems, and citizens who lived near the dam, the government turned to the United Nations for help.2. Temples and other cultural sites were taken down piece by piece, and then moved and put back together again in a place where they were safe from the water.Step 2 PracticePlease complete these sentences with relative pronouns and relative adverbs and answer the following questions.Questions: 1. What is the head noun ?2. What relative words should be used ?3. What elements do they act in these sentences ?

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Listening&Speaking&Talking教案

    新人教版高中英語必修2Unit 1 Cultural Heritage-Listening&Speaking&Talking教案

    Listening and Speaking introduces the topic of “Take part in a youth project”. The listening text is an interview about an international youth cultural heritage protection project. More than 20 high school students from seven countries participated in the project. The reporter interviewed two participants Stephanie and Liu Bin. By listening to the text, students can understand the significance of cultural heritage protection, and teenagers can use their knowledge, combine their own interests and advantages, etc. to participate in the action of cultural heritage protection. Listening and Talking introduces the theme of "Talk about history and culture". The listening text is a dialogue between two tourists and tour guides when they visit the Kremlin, red square and surrounding buildings. The dialogue focuses on the functional items of "starting a conversation", which is used to politely and appropriately attract the attention of the others, so as to smoothly start a conversation or start a new topic. The purpose of this section is to guide students to understand the history and current situation of Chinese and foreign cultural heritage in their own tourism experiences or from other people's tourism experiences, explore the historical and cultural values, and be able to express accurately and appropriately in oral communication.1. Guide students to understand the content of listening texts in terms of the whole and key details; 2. Cultivate students' ability to guess the meaning of words in listening; discuss with their peers how to participate in cultural heritage protection activities.3. Instruct students to use functional sentences of the dialogue such as “I beg your pardon, but…” “Forgive me for asking, but…" and so on to start the conversation more politely and appropriately.

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Reading and Thinking教案二

    新人教版高中英語必修2Unit 1 Cultural Heritage-Reading and Thinking教案二

    1. This section focuses on "Understanding how a problem was solved”, which is aimed to guide students to analyze and discuss the challenges and problems faced by cultural heritage protection during the construction of Aswan Dam, as well as the solutions. On the basis of understanding, students should pay attention to the key role of international cooperation in solving problems, and attach importance to the balance and coordination between cultural heritage protection and social and economic development. Students are encouraged to face challenges actively, be good at cooperation, and make continuous efforts to find reasonable ways and means to solve problems.2. Enable students to understand the main information and text structure of the reading text;3. Motivate students to use the reading strategy "make a timeline" according to the appropriate text genre;4. Enable students to understand how a problem was solved;5. Enable students to understand the value of protecting cultural heritage by teamwork and global community;1. Guide students to pay attention to reading strategies, such as prediction, self-questioning and scanning.2. Help students sort out the topic language about protecting cultural relics and understand the narrative characteristics of "time-event" in illustrative style3. Lead students to understand the value of protecting cultural heritage by teamwork and global community;

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Reading and Thinking教案一

    新人教版高中英語必修2Unit 1 Cultural Heritage-Reading and Thinking教案一

    The theme of the reading and thinking is about “Understanding how a problem was solved”.The Listening & Speaking & Talking is about international co-work to protect the Mount Tai, in which the students from seven countries came up with many solutions even create the Mount Tai App. This section aims at showing how to solve a difficult and even tough problem about protecting the cultural heritage by the international co-work. So in this section, cultivating students’ international awareness is very clear and important. Concretely, with the economic development, how to balance the protection of cultural relics and social development is a big challenge for human. In the 1950s, the Egyptian government wanted to build the Aswan Dam across the Nile to control floods, produce electricity and water farms. But the proposal led to protests because it would destroy a lot of cultural relics. The Egyptian had no choice but ask the UN for help. Therefore, a international cooperation about how to protect the cultural relics began, which involved the time length about 20 years and a large amount of fund. Then, the problems was solved. 1. Read quickly to get the main idea and the structure of the article; read careful to get detailed information.2. Learn to use the reading strategy---making a timeline3. Learn how to solve a tough problem by asking for help and cooperation4. Have the international awareness and understand the great strength of international cooperation.1. Read quickly to get the main idea and the structure of the article; read careful to get detailed information.2. Learn to use the reading strategy---making a timeline.3. Learn how to solve a tough problem by asking for help and cooperation.

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Reading For Writing教案

    新人教版高中英語必修2Unit 1 Cultural Heritage-Reading For Writing教案

    This report is short, concise and has typical news content and language features. The title uses the verb phrases, embodying the characteristics of being concise and general. The introduction is the first two sentences in the first paragraph, describing the general situation of the cultural heritage protection project, including time, place, characters, events and other news elements, so that readers can see the main points of the news report at a glance. The main body is the second and third paragraphs, which report the important historical and cultural value of Mogao Grottoes and the production of Mogao Grottoes Material digital photos, which are of great significance to the inheritance of historical culture and the promotion of international cultural understanding, exchange and cooperation. Direct citation is used in the report, as well as background introduction and other news writing techniques.1. Get students to have a good understanding of some features about a news report by reading the text.2. Instruct students to write a summary about a news report properly using some newly acquired writing skills in this period.3. Develop students’ writing and cooperating abilities.4. Strengthen students’ great interest in writing discourses.1. Stimulate students to have a good understanding of how to a summary about a news report 2. Cultivate students to write a news report properly and concisely.Step 1: Lead in Do you think it is necessary for us to circulate our cultural heritage to the world? Why or why not?Do we need to learn more about other countries’ cultural heritage? Why or why not?Step 2: Read to discover details concerning the main body of the news report.

  • 新人教版高中英語必修1Unit 4 Natural Disasters- Reading for writing教案

    新人教版高中英語必修1Unit 4 Natural Disasters- Reading for writing教案

    ①標題——標題應當簡潔明了。②導語——導語是消息開頭的第一段或第一句話,簡明扼要地揭示出消息的核心內容。③主體——主體是消息的主要部分,要用充足的事實表現(xiàn)主題,對導語的內容作進一步的展開和闡述。④結束語——通常是對全文內容進行概括性的總結。3. 新聞報道增分句子(1)陳述事實常用的句型:①A terrible storm hit/struck ... , killing ..②It was a cool autumn night when the earthquake happened. A large number of buildings fell down and roads were destroyed, leaving a great many people homeless.地震發(fā)生在一個涼爽的秋夜。大量的建筑物倒塌,道路被毀,許多人無家可歸。③With the help of the rescue team, people who were the trapped in the flood were saved.在救援隊的幫助下,困在洪水中的人們得救了。(2)陳述觀點常用的句型:①Clearly/Obviously/In my opinion/It seemed that people were shocked.顯然/在我看來/似乎人們震驚了。②The whole city was in ruins after the earthquake.地震后整個城市成了一片廢墟。(3)揭示原因常用的句型:Because of/As a result of/Thanks to the help of the army, people who got injured were sent to the hospital immediately.

  • 新人教版高中英語必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案一

    新人教版高中英語必修2Unit 1 Cultural Heritage-Discovering Useful Structure教案一

    This teaching period mainly deals with grammar “restrictive relative clauses.” To begin with, teachers should lead students to revise what they have learned about the relative pronouns and relative adverbs. And then, teachers move on to stress more special cases concerning this grammar, such as the “preposition+ relative pronouns which and whom” and cases where we can omit the relative pronouns. This period carries considerable significance to the cultivation of students’ writing competence and lays a solid foundation for the basic appreciation of language beauty. The teacher is expected to enable students to master this period thoroughly and consolidate the knowledge by doing some exercises. 1. Guide students to review the basic usages of relative pronouns and adverbs of attributive clauses.2. Lead students to learn to use some special cases concerning restrictive relative clauses flexibly.2. Enable students to use the basic phrases structures flexibly.3. Strengthen students’ great interest in grammar learning.1. Help students to appreciate the function of relative pronouns and adverbs of attributive clauses in a sentence2. Instruct students to write essays using the proper relative pronouns and adverbs of attributive clauses.本節(jié)語法思考:定語從句在復合句中的作用是什么? 關系詞有哪些?定語從句在復合句中的作用相當于形容詞,它在句中作定語修飾名詞或代詞。他們在先行詞和定語從句之間起到聯(lián)系作用,同時在意義上代表先行詞并在定語從句中擔任一個成分。被定語從句所修飾的詞稱先行詞,定語從句一般放在先行詞的后面。

  • 人教版高中政治必修3體味文化教案2篇

    人教版高中政治必修3體味文化教案2篇

    3、文化是人們的一種素養(yǎng)(1)人的文化素養(yǎng)是在社會生活、實踐中形成的。每個人所具有的文化素養(yǎng),不是天生的,而是通過對社會生活的體驗,特別是通過參與文化生活、接受知識文化教育而逐步培養(yǎng)出來的。文化素養(yǎng)的形成,離不開生活、實踐和教育。人們在社會實踐中創(chuàng)造和發(fā)展文化,也在社會生活中獲得和享用文化。(2)人的文化素養(yǎng)表現(xiàn)在日常言行中。教師活動:引導學生閱讀教材7頁“公交車漫畫”材料,并思考所反映的問題學生活動:積極思考并討論問題教師點評:人們的精神活動離不開物質活動,人們的文化素養(yǎng)總是要通過他在日常生活中的言行、在社會實踐活動中的表現(xiàn)等表現(xiàn)出來。我們通過觀察人們的社會行為,就可以從中透視人們的精神世界和精神生活。4、文化的傳承和發(fā)展離不開物質載體。社會文化和精神產品離不開物質載體,一個時代的文化和精神產品,往往是這一時代社會發(fā)展軌跡的反映。

  • 人教版高中語文必修3《一名物理學家的教育歷程》教案

    人教版高中語文必修3《一名物理學家的教育歷程》教案

    ①闡發(fā)話題式:就是用簡練的語言對所給話題材料加以概括和濃縮,并找到一個最佳切入點加以深層次闡述。吉林一考生的滿分作文《漫談“感情”“認知”》的題記是:“同是對‘修墻’‘防盜’的預見,卻產生‘聰明’或‘被懷疑’的結果。‘感情’竟能如此地左右著‘認知’,心的小舟啊,在文化的河流中求索。”這個題記通過對材料的簡單解釋,將“感情”與“認知”二者的關系詮釋得非常明白,也點明了作者的態(tài)度和議論的中心。②詮釋題目式:所擬題目一般都具有深刻性特點,運用題記形式對題目進行巧妙而又全面的詮釋。云南一考生的滿分作文《與你同行》的題記是:“他們一路同行,一個汲著水,一個負著火,形影相隨。在他們攜手共進時,就產生了智慧。”這個題記形象而深刻地對“與你同行”這個題目進行了解釋,言簡意賅,表明了考生對感情和理智關系的認識。

  • 人教版新課標高中物理必修2生活中的圓周運動教案2篇

    人教版新課標高中物理必修2生活中的圓周運動教案2篇

    思考:洗衣機脫水時轉速高時容易甩干衣物,還是轉速低時容易甩干衣物?(2) 制作棉花糖的原理內筒與洗衣機的脫水筒相似,里面加入白砂糖,加熱使糖熔化成糖汁。內筒高速旋轉,黏稠的糖汁就做離心運動,從內筒壁的小孔飛散出去,成為絲狀到達溫度較低的外筒,并迅速冷卻凝固,變得纖細雪白,像一團團棉花。5.離心現(xiàn)象的防止在水平公路上行駛的汽車,轉彎時所需的向心力是由車輪與路面的靜摩擦力提供的。如果轉彎時速度過大,所需向心力F大于最大靜摩擦力Fmax,汽車將做離心運動而造成交通事故。因此,在公路彎道處,車輛行駛不允許超過規(guī)定的速度。當高速轉動的砂輪或者飛輪內部分子間相互作用力不足以提供所需向心力時,離心運動就會使他們破裂,甚至釀成事故。

  • 人教版新課標高中物理必修2行星的運動教案2篇

    人教版新課標高中物理必修2行星的運動教案2篇

    知識與技能1.知道地心說和日心說的基本內容.2.知道所有行星繞太陽運動的軌道都是橢圓,太陽處在橢圓的一個焦點上.3.知道所有行星的軌道的半長軸的三次方跟它的公轉周期的二次方的比值都相等,且這個比值與行星的質量無關,但與太陽的質量有關.4.理解人們對行星運動的認識過程是漫長復雜的,真理是來之不易的.過程與方法通過托勒密、哥白尼、第谷·布拉赫、開普勒等幾位科學家對行星運動的不同認識,了解人類認識事物本質的曲折性并加深對行星運動的理解.情感、態(tài)度與價值觀1.澄清對天體運動裨秘、模糊的認識,掌握人類認識自然規(guī)律的科學方法.2.感悟科學是人類進步不竭的動力.教學重點理解和掌握開普勒行星運動定律,認識行星的運動.學好本節(jié)有利于對宇宙中行星的運動規(guī)律的認識,掌握人類認識自然規(guī)律的科學方法,并有利于對人造衛(wèi)星的學習.

  • 人教版高中政治必修2政府的職能:管理與服務教案

    人教版高中政治必修2政府的職能:管理與服務教案

    (一)知識目標1、識記我國政府職能的主要內容;政府履行其職能的作用。2、理解國家性質與國家職能的關系;我國政府職能的主要內容及履行的原因;我國政府是便民利民的政府;管理和服務是政府的基本職能。3、運用生活中的事例,評議政府履行職責的表現(xiàn);結合日常生活的事例,感受政府的作用。(二)能力目標1、從國家行使國家職能的具體事實,判斷其屬于何種職能2、說明政府履行其職能對我們生活和社會經濟發(fā)展的影響和作用。(三)情感、態(tài)度與價值觀目標通過對我國的政府職能的學習,使同學們進一步升華對我國的政府是人民的政府的認同。同時,公民也應向政府尋求解決自身困難,維護自身合法權益的幫助,這也有助于政府工作的改進?!锝虒W重點、難點政府職能的問題★ 教學方法教師啟發(fā)、引導,學生自主閱讀、思考,討論、交流學習成果。

  • 人教版高中政治必修4第六課求索真理的歷程精品教案

    人教版高中政治必修4第六課求索真理的歷程精品教案

    二、分析題基于非典型肺炎防治的需要,武漢大學和中國科學院微生物研究所,集中優(yōu)秀人才和先進的儀器設備,以科學的理論為指導,運用現(xiàn)代的知識與技術手段,對SARS病毒進行深入細致的研究。2003年5月,他們聯(lián)合研制出抗擊SARS病毒侵入細胞的多肽藥物。經科學試驗證明,它可以阻斷SARS病毒侵入人體細胞,具有預防和治療兩種功效。這些藥物的發(fā)明在非典型肺炎的預防和治療發(fā)揮著重要的作用。上述材料體現(xiàn)了辯證唯物主義認識論的哪些觀點?答案提示:體現(xiàn)了實踐是認識的來源、實踐是認識發(fā)展的動力、實踐是檢驗認識的真理性的唯一標準、實踐是認識的目的和歸宿、認識對實踐具有反作用等辯證唯物主義認識論的觀點。三、辨析題1、“仁者見仁,智者見智”的說法否定了真理的客觀性答案提示:(1)此觀點錯誤。(2)“仁者見仁,智者見智”是說對同一事物不同的人有不同的見解。

  • 人教版新課標高中物理必修2探究功與速度變化的關系教案2篇

    人教版新課標高中物理必修2探究功與速度變化的關系教案2篇

    說明:“倍增法”是一種重要的物理方法,歷史上庫侖在研究電荷間的相互作用力時曾用過此法,但學生在此前的物理學習中可能未曾遇到類似例子,因此引導學生通過交流,領會“倍增法”的妙處,這是本節(jié)課的一個要點.可用體育鍛煉中的“拉力器”來類比。(2)該方案消除摩擦力影響的方法:所用的消除方法與實驗方案2一樣。也可使用氣墊導軌代替木板,以更好地消除摩擦影響。(3)小車速度的確定方法:①確定打出來的點大致呈現(xiàn)什么規(guī)律:先密后疏(變加速),再均勻分布(勻速);②應研究小車在哪個時刻的速度:在橡皮筋剛恢復原長時小車的瞬時速度,即紙帶上的點剛開始呈現(xiàn)均勻分布時的速度;③應如何取紙帶上的點距以確定速度:由于實驗器材和每次操作的分散性,尤其是橡皮筋不可能長度、粗細完全一致,使得每次改變橡皮筋的條數(shù)后,紙帶上反映小車勻速運動的點數(shù)和點的位置,不一定都在事先的設定點(即用一條橡皮筋拉小車,橡皮筋剛好恢復原長時紙帶上的點)處。

  • 人教版高中政治必修2政府的職能:管理與服務教案

    人教版高中政治必修2政府的職能:管理與服務教案

    《政府的職能:管理與服務》是高一《政治生活》第二單元第一課?,F(xiàn)代社會,人們的社會生活離不開政府的組織和管理,政府是執(zhí)行國家權力的機關。第二單元的主題內容是《為人民服務的政府》,分析政府與人民的關系。而本框則通過講述政府的四個方面的主要職能,讓學生了解到我們的生活接受政府的管理,又享受政府提供的各種服務,從而體會到我們的政府是便民利民的政府,初步明確政府為人民服務的宗旨。二、教學目標(一)知識目標1、識記我國政府職能的主要內容;政府履行其職能的作用。2、理解國家性質與國家職能的關系;我國政府職能的主要內容及履行的原因;我國政府是便民利民的政府;管理和服務是政府的基本職能。3、運用生活中的事例,評議政府履行職責的表現(xiàn);結合日常生活的事例,感受政府的作用。(二)能力目標1、 從國家行使國家職能的具體事實,判斷其屬于何種職能2、 說明政府履行其職能對我們生活和社會經濟發(fā)展的影響和作用。

  • 人教版高中政治必修4第六課求索真理的歷程教案

    人教版高中政治必修4第六課求索真理的歷程教案

    農業(yè)科學的周期是以年為時間單位,一次實驗就要等到一次花開、結果。就這樣,幾個實驗誤導了袁隆平好幾年。這時登在《參考消息》上的一篇不起眼的文章像給迷途中的袁隆平以當頭一棒:克里克、沃森和威爾金斯發(fā)現(xiàn)DNA螺旋結構,西方的遺傳學研究進入分子水平?!拔耶敃r還在那里搞什么無性雜交,糟糕得很”。水稻是自花授粉植物,雄蕊雌蕊都在一朵花里面,雌雄同株,沒有雜種優(yōu)勢一雜種優(yōu)勢是生物界的普遍現(xiàn)象,小到細菌,大到人,近親繁殖的結果是種群的退化。但是水稻因為花小,其雜交是當時公認的世界難題,設在馬尼拉的世界水稻研究中心就是因為困難重重,差點關閉。袁隆平偏不信這個邪,他突發(fā)靈感:專門培養(yǎng)一種特殊的水稻品種——雄花退化的雄性不育系,沒有自己的花粉,這樣不就可以做到雜種優(yōu)勢了嗎?于是,漫長的尋找過程開始了,要找到這樣一株雄花退化而且雜交之后產量猛增的“太監(jiān)”水稻簡直是大海撈針。

  • 人教版新課標高中物理必修2太陽與行星間的引力教案2篇

    人教版新課標高中物理必修2太陽與行星間的引力教案2篇

    【學習內容分析】在行星運動規(guī)律與萬有引力定律兩節(jié)內容之間安排本節(jié)內容,是為了更突出發(fā)現(xiàn)萬有引力定律的這個科學過程。如果說上一節(jié)內容是從運動學角度描述行星運動的話,那么,本節(jié)內容是從動力學角度來研究行星運動的,研究過程是依據已有規(guī)律進行的演繹推理過程。教科書在尊重歷史事實的前提下,通過一些邏輯思維的鋪墊,讓學生以自己現(xiàn)有的知識基礎身于歷史的背景下,經歷一次“發(fā)現(xiàn)”萬有引力的過程,因此體驗物理學研究問題的方法就成為主要的教學目標?!緦W情分析】在學太陽對行星的引力之前,學生已經對力、重力、向心力、加速度、重力加速度、向心加速度等概念有了較好的理解,并且掌握自由落體運動和圓周運動等運動規(guī)律,能熟練運用牛頓運動定律解決動力學問題。已經完全具備深入探究和學習萬有引力定律的起點能力。所以在推導太陽與行星運動規(guī)律時,教師可以要求學生自主地運用原有的知識進行推導,并要求說明每一步推理的理論依據是什么,教師僅在難點問題上做適當?shù)狞c撥。

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    高中物理必修二圓周運動教案

    1、知識與技能  (1)認識勻速圓周運動的概念,理解線速度的概念,知道它就是物體做勻速圓周運動的瞬時速度;理解角速度和周期的概念,會用它們的公式進行計算;  (2)理解線速度、角速度、周期之間的關系:v=rω=2πr/T;  (3)理解勻速圓周運動是變速運動?! ?、過程與方法  (1)運用極限法理解線速度的瞬時性.掌握運用圓周運動的特點如何去分析有關問題;  (2)體會有了線速度后.為什么還要引入角速度.運用數(shù)學知識推導角速度的單位。

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