
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.

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.

Knowledge objectives:(1) to make Ss grasp the usage of words, expressions and sentence structures: statistics, struggle, thanks to, rid of, some patterns for persuasion, the “ing” form as subject and object;(2)to use learnt knowledge to persuade sb.Ability objectives:(1) to develop Ss’ reading skills(skimming, scanning, word guessing);(2) to improve Ss’ speaking, communicating and cooperating skills.Emotional objectives:to make Ss know the contribution of Yuan,and learn his spirit and his simple life time.Teaching important and difficult points:(1) some words, expressions and sentence structures mentioned above;(2)the content of the text;(3)training their reading and speaking skills.Teaching methods: CLT, TBLT,QT.Learning strategies: CLS, QLS, TBLS.Teaching procedures:Step 1 lead-in: (1) teacher plays a piece of recent news from CCTV about the harvest of the super hybrid rice, and ask students whether they know Yuan or not, and talk about him and his contribution.(2)Brain storm: let Ss describe Yuan in their minds including his appearance, his living condition and so on.Step 2 fast reading tasks:(1)teacher introduces Yuan and super hybrid rice(2)make Ss read the text as fast as possible with questions. Such as: what’s the general ideaof this passage? What’s Yuan’ dream? (skimming and scanning skill)Step 3 intensive reading tasks(1)let Ss read the text silently, find topic sentence of each paragraph and draw the difficult sentences and the knowledge what they don’t understand.(words guessing)(2)teacher and Ss talk about the important words, expressions and sentences together, and ask Ss to retell the content of the text.(summarizing and paraphrasing)(3)teacher summarize this part.(4) read again following the courseware.

在接下來(lái)的細(xì)讀環(huán)節(jié),我套用了高考對(duì)閱讀理解的考查方式設(shè)置了5個(gè)問題,分別為三個(gè)推理判斷題,一個(gè)細(xì)節(jié)題和一個(gè)主旨大意題。學(xué)生需要對(duì)文章的內(nèi)容進(jìn)行分析、歸納、推理、猜測(cè)等高級(jí)思維活動(dòng)才能做出正確的回答?!驹O(shè)計(jì)意圖】這一過程是對(duì)學(xué)生進(jìn)行細(xì)讀的訓(xùn)練,培養(yǎng)學(xué)生獲取特定信息和挖掘文章深層次信息的能力。第三環(huán)節(jié):Intensive-reading (精讀) 15′第三個(gè)環(huán)節(jié)精讀,既是最重要的環(huán)節(jié),也是突破本課重難點(diǎn)的關(guān)鍵。首先,讓學(xué)生思考劇本中人物看到百萬(wàn)英鎊前后的態(tài)度發(fā)生了怎樣的變化。其次,讓學(xué)生仔細(xì)閱讀文章,找出可以表現(xiàn)人物態(tài)度變化的具體的語(yǔ)言和動(dòng)作。最后,讓學(xué)生總結(jié)人物的態(tài)度發(fā)生變化的根本原因是什么,從而引出Money Talks, 供學(xué)生思考?!驹O(shè)計(jì)意圖】通過一系列的活動(dòng)培養(yǎng)學(xué)生學(xué)習(xí)從人物的語(yǔ)言和動(dòng)作探究人物的心理,使學(xué)生進(jìn)一步體會(huì)戲劇語(yǔ)言的魅力,從而對(duì)文章背后所反映的社會(huì)問題進(jìn)行思考,也為下一步的討論環(huán)節(jié)做好鋪墊。

通過寫文章梗概,培養(yǎng)學(xué)生綜合運(yùn)用語(yǔ)言的能力,學(xué)習(xí)用恰當(dāng)?shù)挠⒄Z(yǔ)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(lái)幫助學(xué)生整理語(yǔ)篇,從而來(lái)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(dòng),讓學(xué)生對(duì)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(dòng)參與課堂教學(xué)活動(dòng),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?

Good afternoon, everyone. It’s my great pleasure to be here sharing my lesson with you. The content of my lesson is Senior English for China Book5 Unit 3 Life in the Future. I’ll be ready to begin this lesson from six parts: Analysis of the teaching material, Analysis of the students, Teaching aims and important and difficult points, Teaching methods and aids, Teaching procedures, and Blackboard design. First, let me talk about the teaching material.Part 1 Analysis of the Teaching Material:This unit is about what human beings’ life will be like in about one thousand years. By studying of this unit, we’ll Enable the students to know the changes in humans’ life and some new inventions bringing about the change and develop the interest in science. This lesson plays an important part in the English teaching in this unit. This is an important lesson in Book Five. From this lesson, it starts asking the Ss to grasp contents of each passage. Therefore, this lesson is in the important position of the teaching material. If the Ss can learn it well, it will be helpful to make the Ss learn the rest of this unit.Part 2 Analysis of the SsAs Senior2 Ss, they are at different levels of English fluency, some of them have lost interest in English. So during the lesson, I arrange a variety of activities to let all of them join in to attract their interest and let them be confident and taste the joy of success.

今天我們來(lái)介紹一下必修五第四單元的授課方式。這個(gè)單元的題目是Making the news。應(yīng)該是學(xué)生比較感興趣的話題,學(xué)生往往對(duì)新聞工作充滿好奇,所以我們可以利用這個(gè)機(jī)會(huì)多設(shè)計(jì)一些師生互動(dòng)和學(xué)生互動(dòng),來(lái)激發(fā)起學(xué)習(xí)的積極性,提高學(xué)習(xí)效率。同時(shí)我們可以利用這個(gè)單元不僅幫助學(xué)生掌握語(yǔ)言知識(shí),培養(yǎng)語(yǔ)言能力,同時(shí)讓其了解新聞工作的重要性,培養(yǎng)起社會(huì)智能感。這個(gè)單元分為六個(gè)課時(shí),它的教學(xué)目標(biāo)是這樣的:語(yǔ)言目標(biāo)是掌握詞匯表中的常用單詞和短語(yǔ),掌握倒裝句的一些基本用法。 技能目標(biāo)是能初步掌握約會(huì)的基本句型并在真實(shí)的場(chǎng)景下正確運(yùn)用。新聞報(bào)道類文章的寫作技能。采訪的基本規(guī)范和溝通技能。情感目標(biāo)是對(duì)新聞報(bào)道的客觀性和真實(shí)性有更好的理解。對(duì)新聞?dòng)浾叩穆殬I(yè)有更深入的了解,并能體會(huì)其工作的重要性。下面我們來(lái)介紹一下第一課時(shí)的授課方式,第一課的教學(xué)目標(biāo)是這樣的第一課時(shí)的教學(xué)目標(biāo)語(yǔ)言目標(biāo):單詞:Occupation, journalist, editor, photographer, curious, personality, enthusiasm

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.

一、教材分析第一目,矛盾的統(tǒng)一性和斗爭(zhēng)性。世界上的一切事物都包含著兩個(gè)方面——矛盾的定義——矛盾的兩個(gè)基本屬性——矛盾的同一性——矛盾的斗爭(zhēng)性——同一性和斗爭(zhēng)性的辯證關(guān)系。這一目的重點(diǎn)是讓學(xué)生理解世界上的一切事物都包含著矛盾,沒有矛盾就沒有世界。第二目,矛盾的普遍性和特殊性。這一目邏輯順序是:事事有矛盾,時(shí)時(shí)有矛盾——承認(rèn)矛盾的普遍性是堅(jiān)持唯物主義的前途——矛盾的特殊性及其三層涵義——矛盾的普遍性和特殊性的辯證關(guān)系——矛盾普遍性和特殊性關(guān)系的原理是矛盾問題的精髓。最后得出結(jié)論:馬克思主義普遍原理與中國(guó)具體實(shí)際相結(jié)合體現(xiàn)了矛盾普遍性和特殊性的具體的歷史的統(tǒng)一。學(xué)習(xí)了唯物辯證法的矛盾觀,就要學(xué)會(huì)理論聯(lián)系實(shí)際,學(xué)會(huì)在生活、學(xué)習(xí)和工作中進(jìn)一步運(yùn)用所學(xué)的知識(shí),處理好生活中的實(shí)際問題

二、課堂教學(xué)(課前由科代表發(fā)回預(yù)習(xí)學(xué)案)1、教師根據(jù)預(yù)習(xí)學(xué)案檢查結(jié)果提出問題(用多媒體展示),引導(dǎo)全班討論(重點(diǎn)討論:①、為什么動(dòng)能的表達(dá)式一定是 mV2 ?你如何得出這個(gè)結(jié)論?②、力在一個(gè)過程中對(duì)物體所做的功,和物體在這個(gè)過程中動(dòng)能的變化量有什么關(guān)系?你如何得出這個(gè)結(jié)論?這個(gè)做功的力和F=ma中的力F有什么關(guān)系)。有困難的小組應(yīng)及時(shí)問老師。老師在這個(gè)過程中巡視指導(dǎo)。2、學(xué)生自主閱讀課文“7 動(dòng)能和動(dòng)能定理”中的“動(dòng)能的表達(dá)式”,然后完成如下練習(xí)(教師在此過程中巡視指導(dǎo)):2.1嘗試推出動(dòng)能的表達(dá)式(鼓勵(lì)會(huì)推導(dǎo)的同學(xué)積極上臺(tái)板演,老師引導(dǎo)討論)。2.2寫出動(dòng)能的小結(jié)(認(rèn)真閱讀教材p66倒數(shù)第二段、第三段,結(jié)合你推導(dǎo)動(dòng)能表達(dá)式的過程,認(rèn)真思考后四人一組討論:①、動(dòng)能是矢量還是標(biāo)量?②、動(dòng)能的單位是什么?③、你認(rèn)為應(yīng)從哪幾方面來(lái)理解動(dòng)能?)

【教學(xué)目標(biāo)】Ⅰ、學(xué)習(xí)理解詩(shī)歌語(yǔ)言的暗示性特質(zhì)。Ⅱ、根據(jù)詩(shī)歌語(yǔ)言的特質(zhì),進(jìn)行遷移,領(lǐng)略詩(shī)歌的精妙之處,給同學(xué)如何鑒賞詩(shī)歌提供實(shí)感。㈠、導(dǎo)入:各位同學(xué),有個(gè)成語(yǔ)叫"一字千金"。對(duì)我而言,第一次領(lǐng)略到一個(gè)字的分量,是在小學(xué)三年級(jí)的時(shí)候,一次作文評(píng)析課上。當(dāng)時(shí)我對(duì)自己的文章充滿了期待,希望能得到老師的贊賞。記得老師進(jìn)來(lái)后的第一句話是"有一篇文章,我就沖它用了一個(gè)字,我給它打95分。打這樣的高分,對(duì)我來(lái)說(shuō),是極為難得的。"同學(xué)都充滿了好奇,老師接著說(shuō)"這個(gè)字就是一個(gè)'悟'字。我們的同學(xué)都說(shuō)我學(xué)到了,我明白了,我懂得了一個(gè)道理,而這位同學(xué)卻用了一個(gè)'悟'字,難能可貴。"這篇文章不是我的,在羨慕的同時(shí),一個(gè)字在文章中的分量就深深的刻在了我的心上。文學(xué)作品中,一個(gè)字精妙與否,足以決定作品是流光溢彩,還是黯然失色。尤其是我們的古典詩(shī)詞,用簡(jiǎn)短的幾個(gè)字,造就的卻是豐富的情感與博大的意境。讀后滿口余香,卻是妙處難與君說(shuō)。這跟詩(shī)歌的語(yǔ)言是密不可分的。今天,我們就通過《說(shuō)"木葉"》一文,對(duì)中國(guó)古典詩(shī)詞語(yǔ)言特質(zhì)作一番探幽。

環(huán)節(jié)四 課堂小結(jié) 鞏固知識(shí)本節(jié)課我采用線索性的板書,整個(gè)知識(shí)結(jié)構(gòu)一目了然,為了充分發(fā)揮學(xué)生在課堂的主體地位,我將課堂小結(jié)交由學(xué)生完成,請(qǐng)學(xué)生根據(jù)課堂學(xué)習(xí)的內(nèi)容,結(jié)合我的板書設(shè)計(jì)來(lái)進(jìn)行小結(jié),以此來(lái)幫助教師在第一時(shí)間掌握學(xué)生學(xué)習(xí)信息的反饋,同時(shí)培養(yǎng)學(xué)生歸納分析能力、概括能力。環(huán)節(jié)五 情景回歸,情感升華我的實(shí)習(xí)指導(dǎo)老師告訴過我們,政治這一門學(xué)科要從生活中來(lái)到生活去,所以在課堂的最后以中菲黃巖島事件為材料背景,引導(dǎo)同學(xué)們思考:作為一名愛國(guó)青年請(qǐng)就如何解決這一問題向政府提出自己的建議和意見。以此培養(yǎng)學(xué)生對(duì)理論的實(shí)際運(yùn)用能力,同時(shí)檢驗(yàn)他們對(duì)知識(shí)的真正掌握情況,以此達(dá)到情感的升華,本節(jié)課,我根據(jù)建構(gòu)主義理論,強(qiáng)調(diào)學(xué)生是學(xué)習(xí)的中心,學(xué)生是知識(shí)意義的主動(dòng)建構(gòu)者,是信息加工的主體,要強(qiáng)調(diào)學(xué)生在課堂中的參與性、以及探究性,不僅讓他們懂得知識(shí),更讓他們相信知識(shí),并且將知識(shí)融入到實(shí)踐當(dāng)中去,最終達(dá)到知、情、意、行的統(tǒng)一。

(3)內(nèi)陸和中西部城鎮(zhèn)主要以煤和火電為主;廣大農(nóng)村和邊遠(yuǎn)地區(qū)大多正從使用農(nóng)作物秸稈等生物能源。(4)人均能源資源不足。我國(guó)是世界第三大能源生產(chǎn)國(guó)和第二大能源消費(fèi)國(guó),而我國(guó)能源短缺,特別是油氣資源短缺已成為制約我國(guó)經(jīng)濟(jì)發(fā)展的重要因素。相關(guān)數(shù)據(jù)——煤炭、石油和天然氣的人均資源占有量只有95t,世界平均值為209t,約是世界人均值的1/2;我國(guó)人均石油可采儲(chǔ)量3t,世界平均值為28t,約為世界平均值的1/10。我國(guó)人均能源消費(fèi)量不足1.2噸標(biāo)準(zhǔn)煤,居世界89位,不足世界人均能源消費(fèi)水平的一半,僅占發(fā)達(dá)國(guó)家的1/5~1/10。其中人均消費(fèi)650kg標(biāo)準(zhǔn)煤,是世界平均額的95%;人均消費(fèi)石油相當(dāng)145kg標(biāo)準(zhǔn)煤,為世界平均數(shù)的16.8%;人均消費(fèi)天然氣相當(dāng)17.7kg標(biāo)準(zhǔn)煤,為世界平均數(shù)的3.9%;人均消費(fèi)電力501.5kWh,為世界平均水平的25%。(5)是能源消費(fèi)結(jié)構(gòu)不合理,突出存在著一低兩高:即電能消費(fèi)比例低,非商品生物能源消費(fèi)量高,一次性商品能源消費(fèi)中原煤消費(fèi)比重高。原煤消費(fèi)達(dá)到75%,遠(yuǎn)高于26.2%的世界平均水平。

一、 教材分析與學(xué)情分析教材分析人民教育出版社普通高中課程標(biāo)準(zhǔn)實(shí)驗(yàn)教科書必修2第七章第九節(jié)。本節(jié)內(nèi)容安排在學(xué)習(xí)機(jī)械能守恒定律之后的目的,是為了使學(xué)生在理論上對(duì)機(jī)械能守恒定律有所了解的基礎(chǔ)上,通過實(shí)驗(yàn)測(cè)量及對(duì)實(shí)驗(yàn)數(shù)據(jù)的分析處理,對(duì)機(jī)械能守恒定律及條件有深刻的認(rèn)識(shí)。學(xué)情分析知識(shí)層面:學(xué)生已經(jīng)掌握了動(dòng)能、重力勢(shì)能等概念以及動(dòng)能定理、機(jī)械能守恒定律等定理、定律;知道功是能量轉(zhuǎn)換的量度以及機(jī)械能守恒的條件。能力層面:學(xué)生已具備一定的實(shí)驗(yàn)操作技能,會(huì)用打點(diǎn)計(jì)時(shí)器以及直尺等實(shí)驗(yàn)儀器。具備一定的數(shù)據(jù)處理能力。二、教學(xué)目標(biāo)與重點(diǎn)、難點(diǎn)教學(xué)目標(biāo)知識(shí)與技能:1、會(huì)用打點(diǎn)計(jì)時(shí)器打下的紙帶計(jì)算物體運(yùn)動(dòng)的速度。2、掌握驗(yàn)證機(jī)械能守恒定律的實(shí)驗(yàn)原理。

1、舉例:2、結(jié)論:(1)物體的運(yùn)動(dòng)軌跡是曲線的運(yùn)動(dòng)叫曲線運(yùn)動(dòng)。(2)曲線運(yùn)動(dòng)中速度方向是時(shí)刻改變的。(二)、曲線運(yùn)動(dòng)方向:1、質(zhì)點(diǎn)在某一點(diǎn)(或某一時(shí)刻)的速度的方向是在曲線的這一點(diǎn)的切線方向。2、曲線運(yùn)動(dòng)中速度方向是時(shí)刻改變的,因此曲線運(yùn)動(dòng)是變速運(yùn)動(dòng)。(三)、曲線運(yùn)動(dòng)條件:1、演示實(shí)驗(yàn):2、結(jié)論:當(dāng)物體所受的合力的方向跟它的速度方向不在同一直線時(shí),物體就做曲線運(yùn)動(dòng)。七、課堂小結(jié):1、運(yùn)動(dòng)軌跡是曲線的運(yùn)動(dòng)叫曲線運(yùn)動(dòng)。2、曲線運(yùn)動(dòng)中速度的方向是時(shí)刻改變的,質(zhì)點(diǎn)在某一點(diǎn)的瞬時(shí)速度的方向在曲線的這一點(diǎn)的切線上。3、當(dāng)合外力F的方向與它的速度方向有一夾角a時(shí),物體做曲線運(yùn)動(dòng)。八、鞏固訓(xùn)練:1、關(guān)于曲線運(yùn)動(dòng),下列說(shuō)法正確的是()。A:曲線運(yùn)動(dòng)一定是變速運(yùn)動(dòng);B:曲線運(yùn)動(dòng)速度的方向不斷的變化,但速度的大小可以不變;

學(xué)生中存在這樣的問題:既然宇宙間的一切物體都是相互吸引的,那么為什么沒有吸引到一起?為了解決這個(gè)問題,安排了例題2例2、兩物體質(zhì)量都是1kg,相距1m,它們間的萬(wàn)有引力是多少?通過本題,讓學(xué)生認(rèn)識(shí)到一般物體間的引力極小,不用考慮。那么,質(zhì)量很大的天體為什么沒被吸引到一塊?從而引出下節(jié)課題。4.課堂小結(jié):本節(jié)課,從天體運(yùn)動(dòng)出發(fā),通過推理證明,形成理性認(rèn)識(shí),再結(jié)合例題習(xí)題使學(xué)生的理性認(rèn)識(shí)再反饋到具體事實(shí)。形成實(shí)踐-理論-實(shí)踐的認(rèn)知循環(huán),順應(yīng)了認(rèn)知規(guī)律.。本共設(shè)計(jì)了很多問,能讓學(xué)生想的盡量讓學(xué)生想、能學(xué)生說(shuō)的盡量讓學(xué)生說(shuō)、能讓學(xué)生做的盡量讓學(xué)生做,全面發(fā)展學(xué)生的各方面能力。再通過作業(yè)和探究性課題使學(xué)生的思維活動(dòng)在時(shí)空上得以延續(xù)。5.布置作業(yè):布置作業(yè)時(shí)刻意安排引入:萬(wàn)有引力、重力、向心力、三者的聯(lián)系,通過引導(dǎo)學(xué)生對(duì)比結(jié)果,從中發(fā)現(xiàn)問題:萬(wàn)有引力與重力向心力的關(guān)系與區(qū)別,為下節(jié)知識(shí)的難點(diǎn)突破作好了鋪墊。

d.某物體沿直線向東運(yùn)動(dòng),原來(lái)的速度是5m/s,2s后速度減小到3m/s,求2s內(nèi)物體速度變化。④如何探究物體作勻速圓周運(yùn)動(dòng)時(shí),在Δt時(shí)間內(nèi)的速度變化?分析:有了同一直線上速度變化的鋪墊后,討論物體做勻速圓周運(yùn)動(dòng)速度的變化就比較自然了,為了給向心加速度方向的學(xué)習(xí)打好基礎(chǔ),可以通過小組協(xié)作,進(jìn)一步完成下列思考題,使同學(xué)們認(rèn)識(shí)到:時(shí)間間隔起短,速度變化的方向起接近半徑方向。(多媒體屏幕投影)a.物體沿半徑為1m的軌道做勻速圓周運(yùn)動(dòng),線速度大小為,求1s內(nèi)物體速度變化并畫出1s內(nèi)速度變化的示意圖。b.分別求出上題中物體在0.5s、0.25s內(nèi)速度變化并畫出相應(yīng)的示意圖。由于沒有辦法直接利用實(shí)驗(yàn)來(lái)驗(yàn)證速度變化的方向,所以,我們采用提供思考題的方法,引導(dǎo)同學(xué)在合作學(xué)習(xí)、自主探究中完成。有了速度變化的研究為鋪墊,加速度的方向問題就迎刃而解了。

[小結(jié)]師:下面同學(xué)們概括總結(jié)本節(jié)所學(xué)的內(nèi)容。請(qǐng)一個(gè)同學(xué)到黑板上總結(jié),其他同學(xué)在筆記本上總結(jié),然后請(qǐng)同學(xué)評(píng)價(jià)黑板上的小結(jié)內(nèi)容。 (學(xué)生認(rèn)真總結(jié)概括本節(jié)內(nèi)容,并把自己這節(jié)課的體會(huì)寫下來(lái)、比較黑板上的小結(jié)和自己的小結(jié),看誰(shuí)的更好,好在什么地方。) 生:本節(jié)課我們通過伽利略理想斜面實(shí)驗(yàn),分析得出了能量以及動(dòng)能和勢(shì)能的概念,從能量的相互轉(zhuǎn)化角度認(rèn)識(shí)到,在動(dòng)能和勢(shì)能的相互轉(zhuǎn)化過程中,能的總量保持不變,即能量是守恒的。通過這節(jié)課的學(xué)習(xí),使我們建立起了守恒的思想。 點(diǎn)評(píng):總結(jié)課堂內(nèi)容,培養(yǎng)學(xué)生概括總結(jié)能力。 教師要放開,讓學(xué)生自己總結(jié)所學(xué)內(nèi)容,允許內(nèi)容的順序不同,從而構(gòu)建他們自己的知識(shí)框架。[布置作業(yè)]課后討論 P3“問題與練習(xí)”中的問題。[課外訓(xùn)練]以豎直上拋的小球?yàn)槔f(shuō)明小球的勢(shì)能和動(dòng)能的轉(zhuǎn)化情況。在這個(gè)例子中是否存在著能的總量保持不變?

設(shè)計(jì)意圖:通過設(shè)疑、討論及學(xué)生的親身體驗(yàn)與教師的引導(dǎo),得到描述圓周運(yùn)動(dòng)快慢的兩個(gè)物理量,也就成功的打破了學(xué)生在認(rèn)識(shí)上的思維障礙,突破了物理概念教學(xué)的難點(diǎn)。在解決線速度和角速度的問題之后,我將引領(lǐng)學(xué)生學(xué)習(xí)勻速圓周運(yùn)動(dòng)的概念以及勻速圓周運(yùn)動(dòng)中線速度、角速度的特點(diǎn)。并引出勻速圓周運(yùn)動(dòng)中周期、轉(zhuǎn)速的知識(shí)。為了加深學(xué)生對(duì)線速度、角速度與半徑關(guān)系的認(rèn)識(shí),我設(shè)計(jì)了第三個(gè)學(xué)生體驗(yàn)活動(dòng):四名學(xué)生以我為圓心做圓周運(yùn)動(dòng),四名學(xué)生始終并列,這時(shí)里圈同學(xué)走動(dòng)不急不慢,而外圈同學(xué)則要小跑。通過學(xué)生的活動(dòng),不難發(fā)現(xiàn)在角速度相同的情況下,半徑越大的線速度也越大。定性的得到了線速度、角速度與半徑的關(guān)系。接下來(lái)讓學(xué)生利用所學(xué)知識(shí)推導(dǎo)線速度、角速度與半徑的關(guān)系。設(shè)計(jì)意圖:這樣就通過設(shè)疑、學(xué)生猜想、體驗(yàn)、推導(dǎo)的方式得到了結(jié)論,突破了本節(jié)課的難點(diǎn)即線速度、角速度與半徑的關(guān)系。

(5)高度不同,對(duì)平拋運(yùn)動(dòng)距離有何影響,是否因?yàn)楦叨葴p小后下落時(shí)間減小,所以要增大速度才能達(dá)到相同的距離?(教學(xué)實(shí)踐證明,這種想法在學(xué)生比較多見。已經(jīng)不自覺的沿用了自由落體運(yùn)動(dòng)的規(guī)律,又隱隱有運(yùn)動(dòng)等時(shí)性的痕跡。應(yīng)引導(dǎo)學(xué)生這一結(jié)果還需實(shí)驗(yàn)驗(yàn)證。)教師的引導(dǎo):其實(shí),我們所提出的看法都跟平拋運(yùn)動(dòng)的規(guī)律有關(guān)系。那么平拋運(yùn)動(dòng)究竟有怎樣的規(guī)律呢?以前學(xué)過的直線運(yùn)動(dòng)知識(shí)還能用于今天的內(nèi)容嗎?由此逐步使學(xué)生意識(shí)到分析平拋運(yùn)動(dòng)須采用運(yùn)動(dòng)合成與分解這一方法。三、實(shí)驗(yàn)驗(yàn)證自主探究(15分鐘) 物理是實(shí)驗(yàn)科學(xué),多媒體教學(xué)不能代替實(shí)驗(yàn)。本教學(xué)設(shè)計(jì)的第三個(gè)環(huán)節(jié)是實(shí)驗(yàn)驗(yàn)證,鼓勵(lì)學(xué)生自主探究。引導(dǎo)學(xué)生根據(jù)自己的猜想(實(shí)驗(yàn)?zāi)康模┰O(shè)計(jì)實(shí)驗(yàn)進(jìn)行驗(yàn)證。(1)介紹手持式平拋豎落儀,引導(dǎo)并小結(jié)實(shí)驗(yàn)要領(lǐng):聽兩小球下落聲音判斷其下落時(shí)間。體會(huì)合運(yùn)動(dòng)和分運(yùn)動(dòng)是等時(shí)的。
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