
[教學(xué)反思]人教版高中語文必修二第三單元安排了《蘭亭集序》《赤壁賦》《游褒禪山記》三篇古代山水游記散文,它們借游賞之事,探索生命的意義、治學(xué)的道理。師者,所以傳道、授業(yè)、解惑也。高中的教材選用的都是歷史經(jīng)典名篇,每一篇都閃爍著儒道釋等百家光輝的思想。編者要老師傳道的意圖很明顯。即非如此,看著這些影響歷代、影響世界的如日月之耀眼光華的偉大思想就躺在我們的教科書里,又如何能不講呢?所以,我將本課的教學(xué)重難點(diǎn)擬定為:幫助學(xué)生建立積極的生死觀,掌握多角度看問題的正確的思想方法。當(dāng)然,也讓學(xué)生領(lǐng)會(huì)了融寫景、抒情、說理于一爐的大家手法。整堂課各教學(xué)環(huán)節(jié),環(huán)環(huán)相扣,過渡自然,讀、思、議、寫訓(xùn)練到位,而且全部圍繞“生死觀”展開,如一篇形散神不散的散文。

學(xué)法指導(dǎo):高一學(xué)生對(duì)文言文閱讀已具備了一些基礎(chǔ)知識(shí)和積累,但對(duì)如何學(xué)習(xí)文言文,還是一個(gè)新課題,因此教師應(yīng)引導(dǎo)學(xué)生掌握學(xué)習(xí)方法,運(yùn)用已有的知識(shí)框架同化新信息,建立新的智能,逐步走向獨(dú)立學(xué)習(xí)的境界。一、引導(dǎo)學(xué)生利用課文注釋,使用工具書自己翻譯,必要時(shí)教師進(jìn)行點(diǎn)撥、解難,培養(yǎng)自學(xué)能力。二、告訴學(xué)生翻譯文言文要遵循的原則。三、調(diào)動(dòng)學(xué)生思考、討論、交流的積極性,教師適時(shí)點(diǎn)撥,培養(yǎng)學(xué)生發(fā)現(xiàn)問題、解決問題的能力。四、提示學(xué)生反復(fù)誦讀課文,體會(huì)文章所闡述的道理。五、鼓勵(lì)學(xué)生及時(shí)歸納學(xué)習(xí)文言文的方法,注意積累文言文知識(shí)。教學(xué)程序:教學(xué)本課可安排2課時(shí)。第一課時(shí):1、導(dǎo)入新課:首先給學(xué)生介紹毛澤東的七絕詩《為李進(jìn)同志題所攝廬山仙人洞照》:“暮色蒼??磩潘?,亂云飛渡仍從容。天生一個(gè)仙人洞,無限風(fēng)光在險(xiǎn)峰?!睂W(xué)生通過誦讀領(lǐng)會(huì)了“無限風(fēng)光在險(xiǎn)峰”一句的含義。隨后因勢(shì)利導(dǎo),引出課題,指出今天我們要學(xué)習(xí)的王安石的《游褒禪山記》,就含有類似的深邃哲理。

我以以《登高》為例,引導(dǎo)學(xué)生進(jìn)行意象分析,感悟意境美。古人云“立象以盡意”“古詩之妙,專求意象”意象是詩人情感的載體,是詩歌的靈魂。引導(dǎo)學(xué)生張開聯(lián)想和想象的翅膀去感受,去體驗(yàn)是意象,詩歌鑒賞的關(guān)鍵??屏治榈抡f“真正藝術(shù)的作品,不是看見的,也不是聽到的,而是想象中的某種東西?!痹娙送ㄟ^想象創(chuàng)造出詩的形象,我們讀者通過想象豐富地再現(xiàn)詩人創(chuàng)造的形象。而感受體驗(yàn)則是以全部身心投入作品,心靈與心靈相溝通,感情與感情相交流,對(duì)詩人的想象活動(dòng)進(jìn)行再經(jīng)歷和再體驗(yàn)。因此,在引導(dǎo)意象解讀中,我先讓學(xué)生點(diǎn)擊這一個(gè),就是通過抓修飾詞、依據(jù)感情基調(diào)、展開想象具體分析本詩中每個(gè)意象的情感意蘊(yùn)和審美意蘊(yùn),使學(xué)生明白意象在每首詩中的獨(dú)特性。

說教材A.教材簡(jiǎn)析《琵琶行(并序)》是人教版《普通高中課程標(biāo)準(zhǔn)實(shí)驗(yàn)教科書語文》必修3第二單元的一篇講讀課文。本單元學(xué)習(xí)的是唐代詩歌,共七首詩。《琵琶行(并序)》是唐代著名現(xiàn)實(shí)主義詩人白居易寫的一首歌行體長(zhǎng)篇敘事詩,是我國古代敘事詩和音樂詩中的“千古絕喝”。詩歌主題鮮明、人物形象生動(dòng),抒情真切細(xì)膩,具有深刻的思想內(nèi)容和卓越的藝術(shù)技巧。B.教學(xué)目標(biāo)《全日制普通高中高級(jí)中學(xué)語文教學(xué)大綱》明確要求我們:在閱讀教學(xué)過程中要引導(dǎo)學(xué)生“感受文學(xué)形象,品味文學(xué)作品的語言和藝術(shù)技巧,初步鑒賞文學(xué)作品”。而本單元的教學(xué)要求是培養(yǎng)學(xué)生詩歌鑒賞的能力。根據(jù)教學(xué)大綱和單元教學(xué)要求,結(jié)合本課特點(diǎn),我制定本課的教學(xué)目標(biāo)是:1.知識(shí)目標(biāo):了解文學(xué)常識(shí);積累重點(diǎn)文言實(shí)詞;品味主旨句“同是天涯淪落人,相逢何必曾相識(shí)”的內(nèi)涵;感知作者把音樂描寫與聽者、演奏者的感情融為一體的寫作特點(diǎn)。

(1)“問君西游何時(shí)還……使人聽此凋朱顏?!痹婎}下未注明送何人入蜀,所以這里的“問君”無妨假定實(shí)有其人,可以讀得親切一些。將行而問“何時(shí)還”,已有不可行之意,重音要落在“不可攀”三字上,當(dāng)用勸說的語氣讀。以下四句借鳥聲渲染旅途中悲涼凄清的氛圍,讀時(shí)要放低聲調(diào),有干里孤身之感,至“愁空山”徐徐而上。然后用感喟的語調(diào)讀主旨句,至“凋朱顏”略作一頓,以示意猶未盡。(2)“連峰去天不盈尺……胡為乎來哉!”仍是說不可行,但內(nèi)容加深了一層,因?yàn)檎f的是蜀道的險(xiǎn)惡。前四句不是純客觀的描寫,讀時(shí)須設(shè)想這是旅游者攀援于“連峰”“絕壁”之上置身于“飛湍瀑流”之間,要使聽者感到驚心動(dòng)魄。讀后可作稍長(zhǎng)停頓,再用“其險(xiǎn)也如此”緩緩收住。末句是詩人借用蜀人的口氣,對(duì)歷險(xiǎn)而來的游者深表嘆息——“胡為乎來哉”不是詢問,當(dāng)用降調(diào)讀,暗含“何苦而來”之意。

一. 教材分析1. 本單元的中心話題是“計(jì)算機(jī)(Computers)”,內(nèi)容涉及計(jì)算機(jī)的發(fā)展歷史,計(jì)算機(jī)的應(yīng)用等。本節(jié)課是該單元的第一課時(shí),我將Warming up, Pre-reading and Comprehending這四部分整合為一節(jié)精讀課。其中。Reading部分是題為WHO AM I?的文章,以第一人稱的擬人手法介紹了計(jì)算機(jī)發(fā)長(zhǎng)演變的歷史和計(jì)算機(jī)在各個(gè)領(lǐng)域的應(yīng)用,其主旨是表達(dá)計(jì)算機(jī)的發(fā)展變化之快以及在生活中用途之廣。而Warming up部分以圖片的形式展現(xiàn)了計(jì)算機(jī)的發(fā)展歷程;Pre-reading中的問題和排序分別是為了預(yù)測(cè)語篇的內(nèi)容和測(cè)試學(xué)生對(duì)計(jì)算機(jī)歷史了解的情況;Comprehending則通過各項(xiàng)練習(xí)訓(xùn)練學(xué)生的閱讀技能,從而加深對(duì)文章的理解??梢娺@幾部分是一個(gè)有機(jī)的整體。2. 教學(xué)目標(biāo):1) 語言目標(biāo):重點(diǎn)詞匯及短語:abacus, calculate, calculator, PC, laptop, PDA, robot, analytical, technological, universal, mathematical, artificial, intelligent, network, explore, in common, as a result.重點(diǎn)句子:a. My real father was Alan Turing, who in 1963 wrote a book to describe how computers could be made to work, and build a “universal machine” to solve any mathematical problem.

When it comes to the students’ studying methods, I'd like to introduce my Ss first. The Ss have a good command of basic language points. They’re interested in learning English, and they take an active part in English class, so they will have fun in autonomous, cooperative and inquiry learning. I will just serve as a guide, showing them the way to explore how to make more progress in their English learning.Now it’s time for the most important stage of this lesson. My teaching procedures are arranged as follows:Step1.Leading-in (3 minute)Play a video of a wide variety of wildlife to introduce my topic. Step2. Speaking (12 minutes)We will use our textbook Page25. Let the Ss fast read the short paragraph to warm up. Ask them to talk about the report on some endangered wildlife in China with the dialogue patterns on the screen. Lastly, I will invite some groups to demonstrate their dialogues about saving wildlife in China.Step3.English play (3 minutes)Watch another video in praise of their excellent performance just now. It’s about Jack Chen’s(成龍)and Yang Ziqiong’s wildlife protection.Step4. Listening (twice 13 minutes)This time, I’ll ask the Ss to fill in the blanks of the monologue of the 2 movie stars above. Step5.Discussion (3 minutes)Which would you like to choose to wear, clothes made of cotton, artificial leather or animal skins? Why ?Step6. Summary (3 minutes)1. If there were no wildlife, there wouldn’t exist human beings. If the buying stops, the killing can, too.2. Animals are our friends. To love animals is to love ourselves. Stop hunting, killing and destroying wildlife.3. Let’s live in harmony with all the living things in the world. Step7. Music appreciation (3 minutes)Let the Ss appreciate the song Earth Song by Michael Jackson. Last but not the least, I will show you my blackboard design.

Then I would ask them to think of a funny English or Chinese and tell it to partners. While telling stories, they can use expressions and some acting to help make the story funny. 5 minutes would be given to do this.Those stories they told there will be the material for their writing. Soletting them tell it at first is helpful. And they can make a difference between telling a funny story and writing it down. Generally speaking, it is difficult forstudents to write well because they don’t know what to write and how to write. Asking them to tell their own stories at first can help them come up with what to write.After their telling, I would invite someone to share his/her story with all of us and I would write it down on the blackboard.This example story would be used as a sample to illustrate the format of funny story. Different from a story from teacher or textbook, a story from students can obviously become a interesting material to draw students’ attention.Then I would ask the whole class to put this story into several parts. It might be a little bit difficult for them. So I would ask them to find out whether all the sentences are necessary. After delete some sentences, there are 6 sentences left behind. Then they can easily put them into three parts. After interaction with students, I would teach them the right terms for each part and conclude the format of funny story.This step is the key and difficult point in my lesson. So I mainly usetask-based teaching method in this part and the task for students was divided into several stages. With the separated difficult level, students can find there are usually three parts in writing. They can also learn to write without the unnecessary parts in the process of analyzing. And then I wouldn’t rush to tell them the right terms to them directly. Instead, I would ask them to name them by their own. A confused mind is better for acquiring knowledge.While-writing:Then I would give students 7 minutes to write down this story, without other requirements.With all the preparations in pre-writing, students’ difficulties were cleared. So it would be much easier for them to write down the story within 7 minutes. There are no other requirements because students’ first writing is actually a drafting. It would be revise and edit several times later. Writing, as a skill

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

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.

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.

(2).教學(xué)手段為了使我根據(jù)教材而設(shè)計(jì)的三個(gè)教學(xué)目標(biāo)以及重點(diǎn)難點(diǎn)得以的突出和突破,達(dá)到最大化的展示境界,同時(shí)也為了配合以上我選擇的四種教法得以完滿實(shí)現(xiàn),我決定采用“多媒體”教學(xué)手段進(jìn)行全程教學(xué)。利用電腦的信息容量大,操作簡(jiǎn)便等優(yōu)點(diǎn),形象生動(dòng)的直觀展示教學(xué)內(nèi)容,不但提高學(xué)習(xí)效率和質(zhì)量,而且容易激發(fā)學(xué)生的學(xué)習(xí)興趣和調(diào)動(dòng)學(xué)習(xí)的積極性。四、說學(xué)法我為學(xué)生設(shè)計(jì)了三個(gè)學(xué)習(xí)方法:1.讓學(xué)生學(xué)會(huì)在探究中學(xué)。通過“對(duì)黑人嚴(yán)酷處境的探究”和對(duì)文中重點(diǎn)語句的探究,培養(yǎng)學(xué)生在探究中學(xué)習(xí)的能力。2.讓學(xué)生學(xué)會(huì)在讀中學(xué)。通過“誦讀法”指導(dǎo)學(xué)生在誦讀過程中感受演講詞內(nèi)在的魅力,學(xué)會(huì)在讀中學(xué)。3.讓學(xué)生學(xué)會(huì)在練習(xí)中學(xué)。通過“課外延伸練習(xí)法”,對(duì)所學(xué)的知識(shí)進(jìn)行運(yùn)用,培養(yǎng)學(xué)生的創(chuàng)新和自學(xué)能力。

6、思考:作者心目中的梁?jiǎn)⒊鞘裁葱蜗竽??明確:梁任公是位有學(xué)問,有文采,有熱心腸的學(xué)者。由學(xué)生找出文中體現(xiàn)梁?jiǎn)⒊瑢W(xué)問、文采的句子。教師展示幻燈。補(bǔ)充介紹:文采不僅體現(xiàn)在書面,也能從流暢的口語表達(dá)中反映?!扼眢笠范潭淌痔N(yùn)涵了什么故事,竟讓梁?jiǎn)⒊枋龅蒙鷦?dòng)感人以至作者多年后還印象深刻呢?《箜篌引》出自《漢樂府詩》,記敘了一個(gè)悲慘壯烈的故事:朝鮮水兵在水邊撐船巡邏時(shí),見一個(gè)白發(fā)狂夫提壺渡江,被水沖走。他的妻子勸阻不及,悲痛欲絕,取出箜篌對(duì)著江水反復(fù)吟唱。一曲終了,她也投河隨夫而去。朝鮮水兵回家向自己的妻子麗玉講述了這個(gè)故事,麗玉援引故事中的悲情,創(chuàng)作了這首歌曲,聽過的人無不動(dòng)容。7、朗讀訓(xùn)練了解《箜篌引》的故事后,請(qǐng)各小組選派代表朗讀,由學(xué)生點(diǎn)評(píng),體會(huì)梁?jiǎn)⒊葜v技巧的高超。8、文中說梁任公是個(gè)熱心腸的人,你同意嗎?通過結(jié)尾段的“熱心腸”轉(zhuǎn)入對(duì)其人格的分析。

本節(jié)課我分成兩個(gè)課時(shí)A首先我會(huì)在在ppt上放幾張關(guān)于區(qū)域的圖,讓學(xué)生思考什么是區(qū)域,區(qū)域有什么特征。其次我會(huì)在在書上畫出區(qū)域的定義,在給與解釋說明,再在書上畫出區(qū)域的四個(gè)特征,讓同學(xué)小組討論哪些區(qū)域是有界的,哪些區(qū)域是無界的,從而加深同學(xué)們對(duì)區(qū)域的理解。B在ppt上放出長(zhǎng)江三角洲和松嫩平原,不同風(fēng)土人情由此導(dǎo)入下一個(gè)知識(shí)點(diǎn):不同區(qū)域由于地理環(huán)境的差異,人們的生產(chǎn)特點(diǎn)有許多的不同,發(fā)展方式也存在差異,然后讓學(xué)生思考長(zhǎng)江三角洲和松嫩平原有什么差異,各自給區(qū)域環(huán)境發(fā)展帶來什么影響,啟發(fā)學(xué)生從氣候等方向思考,然后用表格的方式給不同因素歸類(歸位自然和社會(huì)經(jīng)濟(jì)兩大類)再啟發(fā)同學(xué)們從兩大類分別討論對(duì)農(nóng)業(yè)與工業(yè)發(fā)展的影響,最后再用表格的形式分類表達(dá)C然后給同學(xué)們幾個(gè)問題,鞏固同學(xué)課堂所學(xué),最后留下一個(gè)問題課后解決:除了今天講的因素外還有哪些因素對(duì)區(qū)域發(fā)展產(chǎn)生影響?

二、相對(duì)論的創(chuàng)立【課件】展示下列材料艾伯特·愛因斯坦(1879——1955),1879年3月14日誕生在德國烏爾姆的一個(gè)猶太人家中。1894年舉家遷居意大利米蘭。1900年畢業(yè)于瑞士蘇黎世工業(yè)大學(xué)。愛因斯坦被認(rèn)為是最富于創(chuàng)造力的科學(xué)家,他不但創(chuàng)立了相對(duì)論,還提出了光量子的概念,得出了光電效應(yīng)的基本定律,并揭示了光的波粒二重性本質(zhì),為量子力學(xué)的建立奠定基礎(chǔ)。為此榮獲1921年度的諾貝爾物理學(xué)獎(jiǎng)。同時(shí),他還證明了熱的分子運(yùn)動(dòng)論,提出了測(cè)定分子大小的新方法?!締栴}】19世紀(jì)末20世紀(jì)初愛因斯坦對(duì)物理學(xué)的貢獻(xiàn)是什么?意義是什么?為什么會(huì)出現(xiàn)?1、背景:經(jīng)典物理學(xué)的危機(jī)。19世紀(jì)末三大發(fā)現(xiàn):x射線、放射性和電子,經(jīng)典力學(xué)無法解釋研究中的新問題,如:黑體輻射、光電效應(yīng)等。2、相對(duì)論的提出及主要內(nèi)容:(1)“狹義相對(duì)論”和光速不變?cè)恚?905年提出。

(一)地位《生活中的圓周運(yùn)動(dòng)》這節(jié)課是新課標(biāo)人教版《物理》必修第二冊(cè)第5章《曲線運(yùn)動(dòng)》一章中的第7節(jié),也是該章最后一節(jié)。本節(jié)課是在學(xué)生學(xué)習(xí)了圓周運(yùn)動(dòng)、向心加速度、向心力以后的一節(jié)應(yīng)用課,通過研究圓周運(yùn)動(dòng)規(guī)律在生活中的具體應(yīng)用,使學(xué)生深入理解圓周運(yùn)動(dòng)規(guī)律,并且結(jié)合日常生活中的某些生活體驗(yàn),加深物理知識(shí)在頭腦中的印象。(二)教材處理教材中的“火車轉(zhuǎn)彎”與“汽車過拱橋”根據(jù)學(xué)生接受的難易程度,順序作了對(duì)調(diào),并把最后一部分“離心運(yùn)動(dòng)”放到下一節(jié)課處理。(三)教學(xué)目標(biāo)1.知識(shí)與技能目標(biāo)(1)進(jìn)一步加深對(duì)向心力的認(rèn)識(shí),會(huì)在實(shí)際問題中分析向心力的來源。(2)培養(yǎng)學(xué)生獨(dú)立觀察、分析問題、解決問題的能力,提高學(xué)生概括總結(jié)知識(shí)的能力。(3)了解航天器中的失重現(xiàn)象。2.過程與方法目標(biāo)(1)學(xué)會(huì)分析圓周運(yùn)動(dòng)方法,會(huì)分析拱形橋、彎道等實(shí)際的例子,培養(yǎng)理論聯(lián)系實(shí)際的能力。

基于以上分析,為使本堂課圍繞重點(diǎn)、突破難點(diǎn),同時(shí)讓學(xué)生在課堂教學(xué)中能力得到提高,我設(shè)計(jì)如下教學(xué)過程。(一)創(chuàng)設(shè)情景認(rèn)識(shí)形變由同學(xué)們已有的形變知識(shí)入手,引入新課。教師演示:①彈簧的壓縮形變;②彈簧的拉伸形變③視頻播放:竹竿形變、鋼絲的扭轉(zhuǎn)形變。得出形變的概念及各類形變。[設(shè)計(jì)意圖:我從生活情景中引入新課,是為了激發(fā)學(xué)生的好奇心,為學(xué)生學(xué)習(xí)重點(diǎn)和難點(diǎn)內(nèi)容作鋪墊。]設(shè)問:摩天大樓在風(fēng)的吹拂下會(huì)不會(huì)擺動(dòng),發(fā)生形變嗎?演示微小形變放大實(shí)驗(yàn):由于這種形變不容易觀察,會(huì)使學(xué)生產(chǎn)生疑問:到底有沒有發(fā)生形變?解決的辦法是微小形變的演示實(shí)驗(yàn)。為什么光點(diǎn)會(huì)往下移?讓學(xué)生帶著問題思考后得出結(jié)論:是由于桌面發(fā)生了形變,但是形變不明顯。為后面解決壓力和支持力都是彈力做好鋪墊。[設(shè)計(jì)意圖:使學(xué)生知道“放大”是一種科學(xué)探究的方法。]

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(duì)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(dòng)的問題,對(duì)于變速圓周運(yùn)動(dòng),我通過鏈球運(yùn)動(dòng)進(jìn)行引入,這里是一個(gè)鏈球運(yùn)動(dòng)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(dòng)嗎? 然后再課堂上我們?cè)僮鲆粋€(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(duì)小球,做加速圓周運(yùn)動(dòng),進(jìn)行受力分析,我們可以看到,小球做加速運(yùn)動(dòng)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(dòng)速度大小,法線方向分力,改變了小球運(yùn)動(dòng)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,

環(huán)節(jié)三情景模擬 情感升華首先:1、本課開始觀看的視頻中:選出村長(zhǎng)體現(xiàn)了村民參加選舉的什么態(tài)度?生活中一些人“多我一票不多,少我一票不少,選舉與我無關(guān)"的想法2、你如何看待上述兩種不同態(tài)度?為什么?發(fā)表你的看法【教師這個(gè)過程中點(diǎn)撥、引導(dǎo)】如果我們都不珍惜自己的選舉權(quán),那么我們的國家將會(huì)出現(xiàn)什么后果?3、那么作為將來選民和被選舉人,你們認(rèn)為應(yīng)具有那些政治素養(yǎng)才能適應(yīng)?學(xué)生結(jié)合教材思考(1)(提示)不行使或不認(rèn)真行使自己的選舉權(quán),意味著我們將不能選舉出能為人民謀福利的當(dāng)家人,意味著我們的國家將由重蹈舊中國的覆轍。(2)從態(tài)度上講:公民應(yīng)積極參加選舉,認(rèn)真行使這一權(quán)利,不斷增強(qiáng)公民意識(shí)和主人翁意識(shí),增強(qiáng)公民的參與感和責(zé)任感。(3)從能力上講:要不斷提高公民的政治參與能力(政治素質(zhì)、文化素質(zhì)、議政能力),在周全考慮、理性判斷的基礎(chǔ)上,鄭重地投出自己的一票。

1、外匯與外幣的關(guān)系:(1)外匯包括外幣,但外匯不等于就是外幣。外幣是指外國的貨幣,包括外國的紙幣、鑄幣;外匯通常是以外國貨幣表示的用于國際間結(jié)算的支付手段,具體包括外幣、外幣有價(jià)證券、外幣支付憑證等。(2)外幣屬于外匯的范圍,但不能把二者等同起來。通常情況下,只有可以自由兌換的外幣才是外匯,因?yàn)橥鈪R的實(shí)質(zhì)是國際支付手段,如果某種貨幣不能自由兌換,它就不能成為國際支付手段。外匯執(zhí)行的 主要是貨幣的支付手段的職能。(3)持有外匯意味著對(duì)外匯發(fā)行國擁有債權(quán)。持有外匯過多,一方面意味著國際支付能力強(qiáng)和有可能對(duì)外匯發(fā)行國施加影響;另一方面則意味著大量該由本國享受的資源,被借給外國利用,并要承擔(dān)外匯貶值的風(fēng)險(xiǎn)。2、關(guān)于幣值變化的分析:(1)對(duì)貨幣升值的具體分析:一個(gè)國家的貨幣升值(上?。┖?,同量的這種貨幣能比以前換 取更多的他國貨幣,買到更多的他國商品。
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