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人教A版高中數(shù)學(xué)必修二簡單隨機(jī)抽樣教學(xué)設(shè)計(jì)

  • 人教版高中英語必修2The Olympic Games說課稿2篇

    人教版高中英語必修2The Olympic Games說課稿2篇

    Purpose of my design:To ask the students to do these two tasks will make the Ss predict the story of this passage. As a result, it will deepen Ss’ memory of this story because they will have their own understanding of this story.Step 3. While-readingTask 1. (Individual work _____min)Skimming: ask students to skim the text and the main ideas of each paragraph in this passage. Please read it quickly and then match the sentences with the letters.Task 2. (Individual work _____min)Scanning: read the text quickly and decide the whether the following statements are true or false and give reasons.Task 3. (Pair work _____min)Listen to the tape and fill in the banks. Then read the paragraph with expression to your partner.Task4 (individual work min)Listen to the tape again and write down the main idea in one sentence.Purpose of my design: Enable students to understand the given material better by using different reading skills. And proper competition can arouse the Ss’ interest in English learning. “Task-based” teaching method is used here todevelop the Ss’ ability of communication and also their ability of co-operation will be well trainedStep 4. Post-readingTask 1. (Individual work, pair work, group work, class work; _____min)Discussion (group of 4):1. If you were Hippomenes, would you run against Atlanta?2. Do you think Hippomenes deserved to win the race? Why or why not?Step 5. HomeworkPlease read the story again carefully after class and imagine: What will happen during the race between Hippomenes and Atlanta? Who do you think will win the race? Do you think Atlanta would marry Hippomenes? Write an end for the story with thses questions.Purpose of my design: Homework is so important and necessary for to master the knowledge they learned after class. It will check whether the Ss achieve the teaching aims.Part 5 Blackboard design

  • 人教版高中英語必修3Canada-the true north說課稿4篇

    人教版高中英語必修3Canada-the true north說課稿4篇

    Good afternoon, teachers, It’s my great pleasure to be here sharing my lesson with you.The content of my lesson is Senior English Book 3 Unit 5 Canada —— “The true North”.I’ll be ready to begin this lesson from five parts. Analysis of the teaching material,the teaching methods,the studying methods, the teaching procedure,and Blackboard design.First, let me talk about the teaching material.Part 1 Teaching Material:This unit is about the introduction of Canada. By studying of this unit,we’ll enable the students to learn the geography, population, main cities, and natural beauty, natural resources of Canada. Through the training of the unit, it also requires students to learn some Language skills such as the expressions of position and emotions.So it plays an important part in the English teaching in this book.After studying the teaching material and analyzing the rule of children’s growing of mind,I think the teaching aims are the followings:1.Knowledge objects:(1) make the students learn some new words and phrases(2) make the students understand the content of the lesson.2.Ability objects:(1)To develop the Ss’ abilities of listening, speaking, reading and writing. Especially reading and speaking ability.(2) learn to talk about the characters of Canada in English(3)To train the Ss’ ability of working in pairs.3.Emotion objects:(1)Enable students to understand the characters of Canada..(2)Stimulate Ss to work hard to make China stronger.Part 2 Teaching Methods:I think helping students learn to master new words and phrases and improve the students’ reading and speaking ability is import and the difficult.According to the analysis of the teaching material and the import points and the difficult points,I will use the following teaching methods : question-guiding approach; fast-reading and careful reading; multi-media teaching methods; discussion

  • 人教版高中英語必修4Theme parks說課稿3篇

    人教版高中英語必修4Theme parks說課稿3篇

    The oldest and the most popular park in the worldenjoy the exciting activities thereget close to the life-size cartoon characters like Mickey Mouse and Donald Duck Step 3 Pre-reading1.What do you suppose a theme park is ?2.What do you think you can see in a theme park?(1.It is a kind of amusement park which has a certain theme – that the whole park is based on. 2.buildings, castles, statues, rare animals and birds, and so on.) Step 4 Reading ----- Theme Parks –---- Fun and More Than Fun1.Predict : Read the title and the pictures on P. 34 and PredictWhat is the meaning of the title “Theme Park – Fun and more than fun”?(The title means that theme parks are fun to visit, but that they can also be educational and can offer useful information.)2.Skimming Fast read and answer:What activities can we take in a theme park?Amusement park: Bumper car Merry-go-round slide bungee jumping Free-fall rides Horror films Pirate ship Ferris wheel roller coaster3.Scanning Read again and you will find various theme parks are mentioned in the passage . Then what are they ?Theme parks: Sports theme park History theme park Culture theme park Marine or Ocean theme Park Future park Science theme park Disneyland4.Careful reading and find the main idea of each paragraph:THEME PARKS---- entertaining/ educationalPara.1 Traditional parks are places to go for relaxation and to have time away from our busy lives.Para.2 Theme parks are different They’re large and full of things to do, see and buy.Para.3 Theme parks are built around a single idea or theme. One example is a sports park.Para.4 Another kind of theme park is historical more and cultural and can be educational.Para.5 Disneylandwas the first theme park. It is based on the fantasy life and characters of Disney’s films.Para.6 Some examples of educational theme parks include sea world parks and science parks.

  • 人教版高中英語必修3Healthy Eating說課稿4篇

    人教版高中英語必修3Healthy Eating說課稿4篇

    Language learning needs a context, which can help the learners to understand the language and then can product comprehensible output, so computer has the advantages to make the materials attractive.Part 3 Learning MethodsTask-based, self-dependent and cooperative learningPart 4 Teaching ProcedureStep One Lead-in“Interest is the best teacher.” Therefore, at the very beginning of the class, I should spark the students’ mind to focus on the centre topic “the band”. I’ll show some pictures of food to attract their attention and then bring some questions.Question:What kind of food they like?What should go into a good meal?The answers must relate to the diet. After this, the students will be eager to know something about a balance diet and this is the very time to naturally lead the class into Step 2Step 2 Reading for information: skimming and scanning In this step, I use Task-based Language Teaching method, which can give students a clear and specific purpose while skimming and scanning the context.Task 1 General ideaThe students will be asked to just glance at the title and the pictures of the passage, and then guess what they will read in the text. And they’ll be divided into groups of four to have a discussion.The purpose is to inspire the students to read actively, not passively. In addition, the task is to develop the students’ reading skill by making prediction and to encourage the students to express their thoughts in English and cooperate with each other.Task 2 Main idea of each paragraphCooperative learning can raise the students’ interest and create an atmosphere of achievement. Based on this theory, I divide the whole class into 4 groups to skim the whole text and get the main idea of each paragraph.

  • 人教版高中英語必修5First aid說課稿6篇

    人教版高中英語必修5First aid說課稿6篇

    In this class, I have 3 teaching aims, that is, knowledge aims, ability aims and emotion aims.1) Knowledge-Teach students new words and expressions, such as temporary, bleed,sprain choke, first aid, fall ill and so on.-Enable students to have a better understanding for some basic knowledge of first aid.2) Ability-Train students’ speaking, reading and writing abilities by different teaching activities, such as skimming, comprehending, team work, role play, retelling and writing.-Develop students’ reading strategy on how to move general idea to specific information.3) Emotion-Promote students’ awareness of giving first aid.- Cultivate students’ creativities.Then let’s come to my teaching methods and activities.III. Teaching methods and activities:To achieve different teaching aims, various kinds of teaching methods and activities will be adopted throughout this period, such as TBL (task-based learning), skimming, team work, brainstorm and others, which can offer students opportunities to fulfill tasks in which they can use language to achieve a specific outcome.IV. Teaching aids:Computer and blackboardV. Teaching important points:1) Make students have a clear mind for the structure of the text.2) Help students understand the theme of the text.VI. Teaching difficulties:1) So many new words may affect students’ understanding.2) How to get students to know about the functions of the skin and thecauses, characteristics and treatments for different degree burns,and the knowledge about giving first aid. VII. Blackboard design:

  • 人教版高中英語必修5Great scientists說課稿4篇

    人教版高中英語必修5Great scientists說課稿4篇

    通過寫文章梗概,培養(yǎng)學(xué)生綜合運(yùn)用語言的能力,學(xué)習(xí)用恰當(dāng)?shù)挠⒄Z描述科學(xué)家的故事。這是本課的教學(xué)難點(diǎn)。教師可以使用完形填空的方式來幫助學(xué)生整理語篇,從而來降低難度。本課的教學(xué)重點(diǎn)的突破方法是:在閱讀前,讓學(xué)生初步了解得出科學(xué)觀點(diǎn)所需要的基本程序,從而輕松而自然地導(dǎo)入文章的閱讀;在閱讀過程中,由易到難設(shè)計(jì)快速閱讀和精讀的問題,層層推進(jìn)各種閱讀活動,讓學(xué)生對閱讀內(nèi)容從整體感知到細(xì)節(jié)理解,最后深層讀懂整篇文章,同時(shí)加強(qiáng)閱讀策略的指導(dǎo),讓每個(gè)學(xué)生都主動參與課堂教學(xué)活動,最終達(dá)到提高閱讀能力的目的。Step 4 Post-readingGroup Activities四人小組共同合作,在老師的適當(dāng)指導(dǎo)下,就以下2個(gè)問題展開討論,讓學(xué)生就所知、所學(xué)、所感和所想融入話題,然后抽若干同學(xué)代表作小組發(fā)言。1. What do you think about John Snow, and what should we learn from him?2. Cholera was 19th century disease, which two diseases are similar to cholera today? Why?

  • 人教版高中英語必修5The United Kingdom說課稿4篇

    人教版高中英語必修5The United Kingdom說課稿4篇

    Teaching Aims:Knowledge 1. Get the students to learn the useful new words and expressions in this section. Aims:2. Let the students learn about how the UK was formed and the four groups of invaders.1. Develop students’ reading ability and let them learn different Ability reading skills. Aims:2. Enable students to learn to talk about the United Kingdom and the Union Jack Emotional 1. Let students know more about the UK2. Develop students’ sense of cooperative learning Aims:Teaching Important Points:1. Let the students learn about the countries of the United Kingdom and the Union Jack2. Get the students to read the passage and know about how the UK was formed and the four groups of invaders.3. Have the students learn different reading skills.Teaching Difficult Ponts:1. Develop students’ reading ability.2. Enable students to talk about the United Kingdom and the Union Jack.3. Let students learn how the UK was formed geographically and historically.Teaching Methods:Showing pictures, asking, exercising, listening, reading etc.Teaching Aids:A computer,a projector and a blackboard.Teaching Procedures: 1) Show a map of the world, ask students the following questions:Where is the UK?What’s the full name of the UK?2) Ask the students work in pairs to do the quiz on Page 9.Do you want to test how many things you know about the United Kingdom? Let’s have a small test.Using the map on P9, students answer the following questions:?How many countries does the UK consist of? What are they??England is divided into three main areas. Do you know what they are? 1) Scanning (10Minutes )Let the students hold the questions asked in pre-reading and read the passagequickly and then let them do the following exercise.Join lines to the right answer.

  • 人教版高中地理必修2綠色產(chǎn)品知多少說課稿

    人教版高中地理必修2綠色產(chǎn)品知多少說課稿

    各小組派代表匯報(bào)。4、教師提出問題組織學(xué)生討論:⑴要想了解更多的綠色食品,了解綠色食品的銷售情況,我們應(yīng)該怎么做?⑵要想了解廣大消費(fèi)者對綠色食品的態(tài)度,食用綠色食品的意義,是否懂得辨認(rèn)綠色食品,以及什么樣的人群對此知識最缺乏等,我們應(yīng)該怎么做?組織學(xué)生匯報(bào)交流。5、做個(gè)“綠色食品”廣告設(shè)計(jì)師。為你喜歡的綠色食品設(shè)計(jì)廣告語,每組推薦一個(gè)。6、讓學(xué)生了解綠色食品認(rèn)證程序。7、綠色食品打“假”隊(duì)員在行動。8、向?qū)W生介紹生態(tài)綠色食品基地。三、活動總結(jié):通過研究、探討,了解學(xué)生對綠色食品的態(tài)度。提問:民以食為天,吃,是一個(gè)大問題,如果你的爸爸媽媽讓你到超市買牛奶、方便面等,你會選擇什么樣的食品?為什么?希望通過今天的學(xué)習(xí),同學(xué)們能夠做到綠色消費(fèi),也希望你們向自己的家人、向周圍的了解學(xué)生對“無公害食品”、“有機(jī)食品”與“綠色食品”的認(rèn)識。

  • 人教版新課標(biāo)高中物理必修2功率說課稿2篇

    人教版新課標(biāo)高中物理必修2功率說課稿2篇

    (一)、復(fù)習(xí)提問1、請說出功的計(jì)算公式及功的單位2、我們用哪個(gè)物理量表示物體運(yùn)動的快慢?(二)、創(chuàng)設(shè)情景,引入新課1、播放多媒體素材,用起重機(jī)和一個(gè)工人搬運(yùn)幾百塊磚比較哪一種方法好?圖中的情景說明了什么問題?(教師通過所設(shè)計(jì)的情景,將學(xué)生引入怎樣比較做功快慢,讓學(xué)生發(fā)表自己的看法,初步知道物體做功是有快慢之分的。)(三)、進(jìn)行新課1、比較做功快慢的方法播放多媒體素材并提出問題:怎樣比較兩個(gè)人誰做功快誰做功慢?教師啟發(fā):以前學(xué)習(xí)過要比較兩物體運(yùn)動的快慢,可以先確定路程再比較時(shí)間,也可以先確定時(shí)間再比較路程。在路程和時(shí)間都不同時(shí),通過計(jì)算速度比較兩物體運(yùn)動的快慢。同理,要比較物體做功的快慢可采用什么方法?

  • 人教版新課標(biāo)高中物理必修2功說課稿2篇

    人教版新課標(biāo)高中物理必修2功說課稿2篇

    探究一:高中階段功的含義是什么?投影:初中九年級《物理》105頁學(xué)生思考:①圖中物體的勢能、動能分別如何變化?②物體能量的變化和做功是否存在關(guān)系?學(xué)生:分組討論,得出結(jié)論:如果物體的能量發(fā)生變化時(shí),說明有力對物體做了功。教師:進(jìn)行點(diǎn)評和小結(jié)(設(shè)計(jì)意圖:對初中知識深化理論認(rèn)識,并為以后功能關(guān)系的教學(xué)作準(zhǔn)備)探究二:力對物體做功的兩個(gè)要素是什么?情景再現(xiàn):找體重相對懸殊的兩位同學(xué),①A同學(xué)試圖抱起B(yǎng)同學(xué),但沒成功。②B同學(xué)抱起A同學(xué)在教室內(nèi)勻速走動。學(xué)生思考:在①中,A是否對B做功?在②中,B是否對A做功?學(xué)生:分析得出做功的兩要素:物體受到力的作用,并且在力的方向上發(fā)生位移.教師:讓學(xué)生分別例舉生活中力對物體做功和不做功的例子,(設(shè)計(jì)意圖:讓學(xué)生親身參與課堂實(shí)驗(yàn),烘托課堂氣氛,相互協(xié)作增進(jìn)同學(xué)情誼)探究三:如果物體的位移不再力的方向上,那么力是否還對物體做功?

  • 人教版新課標(biāo)高中物理必修2向心力說課稿3篇

    人教版新課標(biāo)高中物理必修2向心力說課稿3篇

    通過這個(gè)示例呢,我們可以得到解決向心力問題的一般的步驟,確定對象,找出軌跡,找出圓心,然后進(jìn)行受力分析,讓同學(xué)們參考這樣的步驟,逐步的解決圓周運(yùn)動的問題,對于變速圓周運(yùn)動,我通過鏈球運(yùn)動進(jìn)行引入,這里是一個(gè)鏈球運(yùn)動的視頻,在同學(xué)們觀看視頻之前,我給同學(xué)們提出問題,鏈球收到繩子的拉力,做的是勻速圓周運(yùn)動嗎? 然后再課堂上我們再做一個(gè)小實(shí)驗(yàn), 我們可以通過改變拉線的方式來調(diào)節(jié)小球的速度大小嗎? 那么對小球,做加速圓周運(yùn)動,進(jìn)行受力分析,我們可以看到,小球做加速運(yùn)動時(shí),他所受到的力,并不是嚴(yán)格通過軌跡的圓心,在進(jìn)行分析的時(shí)候,特別強(qiáng)調(diào),小桶所受力的切線方向分力,和法線方向分力,切線方向分力,改變小球運(yùn)動速度大小,法線方向分力,改變了小球運(yùn)動的方向,法線方向的分力,在這里就是向心力,產(chǎn)生了向心加速度,通過這樣一個(gè)例子進(jìn)行分析,同學(xué)們是比較容易理解的,

  • 室內(nèi)精裝修設(shè)計(jì)合同范本

    室內(nèi)精裝修設(shè)計(jì)合同范本

    依據(jù)《中華人民共和國合同法》和相關(guān)法規(guī)的規(guī)定,乙方接受甲方的委托,就_______________________設(shè)計(jì)事項(xiàng),雙方經(jīng)協(xié)商一致,簽訂本合同,信守執(zhí)行。一、合同內(nèi)容及要求:二、設(shè)計(jì)費(fèi)用:設(shè)計(jì)費(fèi)用為_________每平米,共_________平米,總計(jì)為:人民幣¥______________元,(大寫:_______________元整)。三、付款方式:1、甲方需在合同簽訂時(shí)付委托設(shè)計(jì)與制作總費(fèi)用的50%即人民幣¥_________元(大寫:_________________)。2、乙方將設(shè)計(jì)制作印刷品交付甲方時(shí),甲方需向乙方支付合同余款,即人民幣¥______________元(大寫:_________________)。四、設(shè)計(jì)與制作作品的時(shí)間及交付方式:1、設(shè)計(jì)期限:________年____月_____日至________年_____月____日止2、乙方需在雙方約定的時(shí)間內(nèi)完成設(shè)計(jì)方案。因甲方反復(fù)提出修改意見導(dǎo)致乙方工作不能按時(shí)完成時(shí),可延期執(zhí)行,延期時(shí)間由雙方協(xié)商確定。五、知識產(chǎn)權(quán)約定:1、甲方在未付清所有委托設(shè)計(jì)制作費(fèi)用之前,乙方設(shè)計(jì)的作品著作權(quán)歸乙方,甲方對該作品不享有任何權(quán)利。2、甲方將委托設(shè)計(jì)制作的所有費(fèi)用結(jié)算完畢后,甲方擁有作品的所有權(quán)、使用權(quán)和修改權(quán)。

  •  裝飾裝修設(shè)計(jì)合同

    裝飾裝修設(shè)計(jì)合同

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    精裝修住宅正成為一種發(fā)展趨勢,那么室內(nèi)精裝修設(shè)計(jì)合同是怎樣的呢?以下是為大家精心整理的室內(nèi)設(shè)計(jì)精裝修合同,歡迎大家閱讀,供您參考。更多內(nèi)容請關(guān)注。 室內(nèi)精裝修設(shè)計(jì)合同(一) 甲方: 乙方: 依據(jù)《中華人民共和國合同法》和有關(guān)法規(guī)的規(guī)定,乙方接受甲方的委托,就_______________________設(shè)計(jì)事項(xiàng),雙方經(jīng)協(xié)商一致,簽訂本合同,信守執(zhí)行。 一、合同內(nèi)容及要求: 二、設(shè)計(jì)費(fèi)用: 設(shè)計(jì)費(fèi)用為_________每平米,共_________平米,總計(jì)為:人民幣¥______________ 元,(大寫:_______________元整)。三、付款方式: 1、甲方需在合同簽訂時(shí)付委托設(shè)計(jì)與制作總費(fèi)用的50%即人民幣 ¥ _________ 元(大寫:_________________)。 2、乙方將設(shè)計(jì)制作印刷品交付甲方時(shí),甲方需向乙方支付合同余款,即人民幣¥______________元(大寫:_________________

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    一、溫故導(dǎo)入好的導(dǎo)入未成曲調(diào)先有情,可以取得事半功信的教學(xué)效果。對于本節(jié)課我以溫故知新的方式導(dǎo)入,以蘇軾的《赤壁賦》和《念奴嬌》引導(dǎo)學(xué)生感受蘇軾的豪放和闊達(dá),從學(xué)生熟悉領(lǐng)域出發(fā),引導(dǎo)學(xué)生探究他內(nèi)心深處的“柔情似水”,感受他的“十年生死”之夢。二、誦讀感知(亮點(diǎn)一)《語文課程標(biāo)準(zhǔn)》中建議“教師要充分關(guān)注學(xué)生閱讀需求的多樣性,閱讀心理的獨(dú)特性”。所以在本環(huán)節(jié)我將綜合運(yùn)用聽、讀、問、答四種方式教學(xué)。首先通過多媒體聽讀,激發(fā)學(xué)生學(xué)習(xí)興趣,直觀感受蘇軾的痛徹心扉和傷心欲絕。其次指定學(xué)生誦讀,并在誦讀之后,由學(xué)生點(diǎn)評,加深學(xué)生對于斷句、輕重、快慢的理解,進(jìn)一步感受本詞的凄苦哀怨。最后配樂讀,利用凄清的音樂引導(dǎo)學(xué)生通過自己的誦讀來表現(xiàn)詩中所蘊(yùn)含的真摯之感。設(shè)計(jì)意圖:通過多種閱讀方法,反復(fù)閱讀本詞,引導(dǎo)學(xué)生由淺入深的理解本詞的思想內(nèi)容和藝術(shù)風(fēng)格,初步感受作者對妻子的摯愛之情和他的痛徹心扉,加深學(xué)生對文章的理解。

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    古詩詞誦讀《桂枝香?金陵懷古》說課稿(二) 2021-2022學(xué)年統(tǒng)編版高中語文必修下冊

    一、教材解析《桂枝香·金陵懷古》選自統(tǒng)教版必修下冊古詩詞誦讀單元,此詞通過對金陵景物的贊美和歷史興亡的感喟,寄托了作者對當(dāng)時(shí)朝政的擔(dān)憂和對國家政治大事的關(guān)心。全詞情景交融,境界雄渾闊大,風(fēng)格沉郁悲壯,把壯麗的景色和歷史內(nèi)容和諧地融合在一起,自成一格,堪稱名篇。二、學(xué)情分析高中一年級的學(xué)生已具有一定的詩歌閱讀鑒賞能力,對學(xué)生來說,最重要的是積累誦讀方法,提升鑒賞能力。在本文的教學(xué)過程中著重落實(shí)“讀”,通過多樣化的“讀”,提升對詩歌“美”的感悟鑒賞能力。三、教學(xué)目標(biāo)從課程標(biāo)準(zhǔn)中“全面提高學(xué)生語文素養(yǎng)”的基本理念出發(fā),我設(shè)計(jì)了以下教學(xué)目標(biāo):1.語言建構(gòu)與運(yùn)用:疏通疑難字詞,讀懂詩句體會詞的誦讀要領(lǐng)。

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    人教版高中歷史必修2空前嚴(yán)重的資本主義世界經(jīng)濟(jì)危機(jī)教案

    在美國歷史上,很少有像胡佛那樣受到老百姓諷刺、憎惡的總統(tǒng)。用破鐵罐、紙板和粗麻布搭起來的棚戶叫做“胡佛村”,手里提著的裝破爛的口袋叫做“胡佛袋”,鄉(xiāng)下的貧民把破汽車前部鋸掉,套上骨瘦如柴的騾子,叫做“胡佛車” ,在公園長凳上躺著過夜的人用舊報(bào)紙裹身取暖,叫做“胡佛毯”,衣袋翻過來,一個(gè)錢也找不到,叫做“胡佛旗”,野兔被饑餓的農(nóng)民抓來吃,叫做“胡佛豬”。雜耍演員插科打諢說:“什么?生意好起來了嗎,你的意思是說胡佛死了吧?!薄锝虒W(xué)反思:本課內(nèi)容比較條理清楚,旨在說明羅斯福新政實(shí)施的背景。備課時(shí)考慮將課文順序進(jìn)行一下調(diào)整,使學(xué)生能從較直觀的危機(jī)的現(xiàn)象進(jìn)入本課,較易激發(fā)學(xué)生的興趣,再來分析原因?qū)W生也就比較容易接受。在分析原因時(shí)通過材料和課文的閱讀,使學(xué)生自己通過思考逐步得出結(jié)論。而關(guān)于胡佛政府的措施的講述,及問題的提出則可讓學(xué)生先進(jìn)行預(yù)習(xí),為下一課進(jìn)入羅斯福新政的學(xué)習(xí)做好準(zhǔn)備。多媒體課件的應(yīng)用也能使教學(xué)活動順利流暢的進(jìn)行。

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    人教版新課標(biāo)高中物理必修2機(jī)械能守恒定律教案2篇

    (二)進(jìn)行新課1、動能與勢能的相互轉(zhuǎn)化演示實(shí)驗(yàn)1:如右圖,用細(xì)線、小球、帶有標(biāo)尺的鐵架臺等做實(shí)驗(yàn)。把一個(gè)小球用細(xì)線懸掛起來,把小球拉到一定高度的A點(diǎn),然后放開,小球在擺動過程中,重力勢能和動能相互轉(zhuǎn)化。我們看到,小球可以擺到跟A點(diǎn)等高的C點(diǎn),如圖甲。如果用尺子在某一點(diǎn)擋住細(xì)線,小球雖然不能擺到C點(diǎn),但擺到另一側(cè)時(shí),也能達(dá)到跟A點(diǎn)相同的高度,如圖乙。問題:這個(gè)小實(shí)驗(yàn)中,小球的受力情況如何?各個(gè)力的做功情況如何?這個(gè)小實(shí)驗(yàn)說明了什么?學(xué)生觀察演示實(shí)驗(yàn),思考問題,選出代表發(fā)表見解。小球在擺動過程中受重力和繩的拉力作用。拉力和速度方向總垂直,對小球不做功;只有重力對小球能做功。實(shí)驗(yàn)證明,小球在擺動過程中重力勢能和動能在不斷轉(zhuǎn)化。在擺動過程中,小球總能回到原來的高度。可見,重力勢能和動能的總和保持不變。即機(jī)械能保持不變。

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