第一篇：高中英語 Unit 5 Nelson Mandela a modern heroPeriod Two課時作業 新人教版必修1

Period Two Learning about Language Ⅰ.閱讀理解

A

Every child should have a solid science education whether they want to be the next Albert Einstein or Michael Jordan.Science is all around us；it is everywhere，reaching everything that we do.The “we” in that last statement includes children.Children that understand how science plays a role in our everyday lives have a wonderful foundation(基礎)for success in life.Children can learn science at any age.The earlier they start the better.The best way for kids to learn is through play and repetition.These are wonderful science toys for preschool science activities.With play being the best way kids learn，it only makes sense then introducing toys to them that encourage understanding science.Children love to use their imagination to have fun and to help them understand the world around them.So play is a wonderful time to introduce science to them.Think of the games that we used to play.Don’t Spill the Beans, Don’t Break the Ice，the Telephone Game，Lincoln Logs，each of these games has science behind it.Children are by nature curious(好奇的)as they feel out the world，trying to make sense of what is around them.Science feeds that curiosity hunger that they have.It is a hunger that needs to be encouraged and satisfied.Finding these toys is not as hard as one would think.To make sure that you get good quality toys，visit science toy shops online.These are the best places to find unique(獨特的)science toys such as 3D space projectors，or Hydro Greenhouses.Help your children appreciate the world around them with understanding the world around them.This way，they understand how we are all connected together.Children will not only question the world，but be able to come up with answers to those questions on their own.Science is life.【語篇解讀】 不管將來是否從事科學研究，每一個孩子都需要接受科學教育，不僅因為科學和我們的日常生活密切相關，而且學習科學會為他們未來的成功奠定基礎。1．Don’t Spill the Beans，Don’t Break the Ice，the Telephone Game and Lincoln Logs are the games ________．

A．that are the most widely played B．that can introduce science to children C．that most students like to play at school D．that keep children strong and healthy 答案 B 細節理解題。根據第二段最后的“Think of the games that we used to play.Don’t Spill the Beans，Don’t Break the Ice，the Telephone Game，Lincoln Logs，each of these games has science behind it.”可知，這些游戲都有科學的成分，能教給孩子們科學知識。] 2．The third paragraph is mainly to tell us that ________．

A．children are born curious about the world B．it is necessary to feed children in time C．science toys can satisfy children’s curiosity

D．most of the toys online are very cheap 答案 C 主旨大意題。通讀本段可知，本段主要講孩子天生對這個世界好奇，而科學可以滿足他們的好奇心，而教給他們科學知識的最好方法是讓他們玩科學玩具，故選C項。] 3．The text is most probably written for ________．

A．parents

B．scientists

C．children

D．teachers 答案 A 推理判斷題。該文講述了孩子接受科學教育的重要性以及最佳方式，由最后一段“Help your children appreciate the world around them...”可知，本文的寫作對象最有可能是家長。]

B

Wong Fuk-wing，a Hong Kong volunteer(志愿者)at an orphanage(孤兒院)in Yushu，was killed in the earthquake when he was trying to save others on April 14，2010.Wong managed to run safely out of the building with some children when the first quake happened at 7：50 am on April 14，but he went back inside to rescue three other children and three teachers inside，although he knew the danger of aftershocks(余震)． At 10 am，all the children and one of the teachers were saved.However，Wong was buried under the fallen building and died.The other two teachers were still waiting to be rescued.46-year-old Wong was a truck driver，who often said he could only give his efforts to charity(慈善)instead of money，as he did not earn a lot.His tragic(悲劇的)end touched the hearts of many people both in Hong Kong and on the mainland.Wong began volunteering in 2002.In 2003，Wong was told by the doctor he got serious illness，which gave him a great blow.However，the illness did not deter the warm－hearted man.When the earthquake struck Wenchuan in Sichuan Province in 2008，Wong rushed to the disaster area of Shifang to offer his help though his family did not want him to go.In fact，Qinghai is a place Wong had often visited since 2006.As a volunteer，he gave out medicine and clothing to the orphanage there.No one could expect that Wong would die helping others.Hong Kong Chief Secretary Henry Tang Ying-yen said he had “the highest respect” for the hero who gave his life for others.“What he did has shown the Hong Kong spirit.” The citizens of Hong Kong called him “the pride of Hong Kong’s people” and people on the mainland have also praised him as “a true hero”． 【語篇解讀】 本文介紹了香港義工黃福榮——阿福的故事。4．Wong died in the earthquake ________．

A．after he sent medicine and clothing to the orphanage B．when he returned to save the teachers and students C．because he suffered from his serious illness again D．as the first earthquake happened 答案 B 細節理解題。本文第二、三段介紹了阿福地震中救人犧牲的事跡，故選B項。] 5．The underlined word “deter” in Para.5 refers to “________”．

A．prevent C．beat

B．refuse D．encourage 答案 A 詞義猜測題。由第五段中的“When the earthquake struck Wenchuan in Sichuan Province in 2008，Wong rushed to the disaster area of Shifang to offer his help...”可以看出嚴重的疾病也未能阻止他去汶川地震災區當一名志愿者。] 6．Which of the following words can be used to describe Wong according to the passage? A．Honest and self-satisfactory B．Warm-hearted and selfless.C．Proud and self-centered.D．Capable and hardworking.答案 B 推理判斷題。阿福從2002年開始做義工，不顧自身疾病參與汶川地震和玉樹地震的援救工作，并在玉樹地震中獻出生命。從他的事跡不難看出，阿福是一個熱心而無私的人。]

C

A 13-year-old American boy on Saturday became the youngest climber to conquer Mount Qomolangma，the world’s highest mountain.Jordan Romero from Big Bear，California，climbed up the 8，850 meter summit(峰頂)from the Tibetan side.On the same day，a Nepali(尼泊爾的)man，Apa Sherpa，broke his own world record of climbing Qomolangma when he reached the summit for the twentieth time.Apa Sherpa’s team set off from Nepal’s capital，Kathmandu，last month，heading for the base camp(大本營)on the Chinese side of the mountain.“The team has just called in and believe that they are standing on top of Mt.Qomolangma，”Romero’s blog said.“Their dreams have now come true.Everyone is happy.”

The climbing has put Romero one step closer to reaching his goal of climbing the highest mountains on all seven continents(大洲)．“It is just a goal，”Romero said.He had already climbed five peaks(高峰)，and needs to climb only Vinson Massif，the highest peak in Antarctica，to hit his goal.The youngest person before to climb Qomolangma was 16-year-old Temba Tsheri Sherpa of Nepal.Romero climbed together with a team including his father Paul and three local guides.He wanted to pick a small piece of rock from the top of the world and wear it in a necklace.While Nepal insists that anyone planning to climb Mount Qomolangma must be 16，China does not have any age restrictions(限制)．Some mountain climbers haven’t agreed with the Romero family for letting him try it but his father said the climbing from the Chinese side is less dangerous.【語篇解讀】 本文是一篇新聞。一名13歲的美國男孩成功登上了珠穆朗瑪峰的峰頂，轟動了世界。

7．Jordan Romero climbed up Mount Qomolangma mainly to ________．

A．meet Apa Sherpa B．build his body C．break the world record D．realize part of his goal 答案 D 細節理解題。根據第四段的“The climbing...reaching his goal of climbing the highest mountains on all seven continents(大洲)．”可知，喬丹攀登珠穆朗瑪峰的主要目的是要實現他的夢想——登上世界七大洲的高峰。] 8．Why did Jordan Romero choose to climb from the Chinese side of Mount Qomolangma? A．China allows climbers of any age to climb Mt.Qomolangma.B．It wasn’t far from Jordan’s base camp on the Chinese side.C．There were more challenges on the Chinese side.D．There were more local guides on the Chinese side.答案 A 細節理解題。根據最后一段可知，從珠峰的中國境內攀爬有兩個原因，一是沒有最小年齡限制，二是危險較小(他的父親這樣認為)。故選A項。] 9．Which of the following is TRUE? A．Apa Sherpa climbed up Mount Qomolangma from the Tibetan side to the base camp on the Nepali side.B．Jordan Romero’s father and three American guides climbed up Mount Qomolangma with Romero.C．The youngest person who has climbed up the world’s highest mountain is 16 years old.D．Apa Sherpa has reached the summit of Mount Qomolangma twenty times.答案 D 細節理解題。由第二段最后一句可知A項錯誤；由第五段第二句可知B項錯誤；由第一段第一句話可知C項錯誤；由第二段第二句可知D項正確。]

10．What would be the best title for the passage? A．The great dream of picking rocks from top of Qomolangma B．California teen becomes the youngest to climb Qomolangma C．The most number of successful Qomolangma climbs D．Mount Qomolangma climbing becomes more popular 答案 B 主旨大意題。本文是一篇新聞，報道了一名13歲的美國男孩登上了珠穆朗瑪峰頂，成為世界上最年輕的成功登頂珠峰的人。故B項最能概括本文大意。] Ⅱ.根據短文內容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

__1__ Safety in the highway is not totally out of our hands.Here are four ways we can protect ourselves when we travel.__2__ People in small cars are injured more often and more severely than people traveling in large cars.Factories of small cars are strengthening their products’ safety，which helps.But the mix of large cars and small cars on the road is the main reason of the problem.Being thrown into glass and metal car parts，or being thrown from the car can really hurt or even kill you.__3__ The safety belt’s main purpose is to pull you back if your car has a sudden crash with another vehicle or object，or if it rolls over.A belt can reduce the chance of deadly injury by 45% and the chance of serious injury by 50%.Air bags are important.More than half of all new cars sold have air bags.Air bags provide protection in frontal crashes—the type of crash that kills the most drivers—when they are also wearing safety belts.Most people are demanding air bags in the cars they buy.__4__ Effective as they are，they can’t take the place of safety belts.Drunk driving crashes are less likely to happen if you don’t drink.__5__ Many people have realized that drunk driving can lead to death and injury，prison time and other results.There are movements to strengthen penalties(處罰)for drinking and driving.A．How to drive safe.B．You are safe in a large car.C．How to protect ourselves in the highway? D．Air bags are not installed in all cars.E．That’s why safety belts should be worn.F．Drunk driving is the most serious problem.G．But the protection provided by air bags is limited in side or rear crashes.答案 1.C 2.B 3.E 4.G 5.F

第二篇：高一化學必修1 課時作業

高一化學必修1 課時作業

一、選擇題（只有1個正確答案；共6小題，每小題3分，共18分。）

1．下列關于電能的特點敘述中錯誤的是

（）A．電能較其它能源使用方便

B．電能在現代社會中的使用最為廣泛 C．電能使用導致的污染小

D．電能是化學能與各種能量轉化中利用率最高的2．下面的能源中屬于二次能源的是

（）A．電能、蒸汽 B．電能、風能 C．蒸汽、風能 D．煤、石油

3．三峽工程水電站裝機總容量是1820萬千瓦，這將給中國電網帶來歷史性變革，有利于全國電力聯網和西電東輸工程。目前在我國發電總量中的比例最大的是

（）

A．水電（水力發電）

B．火電（火力發電）

C．核電（核能發電）

D．風電（風力發電）

4．火力發電是通過化石燃料燃燒，使化石燃料中化學能轉化為電能，其能量轉化方式正確 的是

（）A．化學能 → 電能

B．化學能 → 機械能 →電能

C．化學能 → 熱能 →電能

D．化學能 → 熱能

→ 機械能 →電能

5．現在電池的種類非常多，且由電池造成的污染越來越嚴重，下列電池不會造成環境污染的是

（）

A．鋰電池

B．鋅錳電池

C．氫氧燃料電池

D．鎳鎘電池

6．化學電池可以直接將化學能轉化為電能，化學電池的本質是

（）A．化合價的升降

B． 電子的轉移 C．氧化還原反應 D．電能的儲存

二、選擇題（有1—2個答案，只有一個正確選項的，多選不給分；有兩個正確選項的，選對一個給2分，選錯一個該小題不給分。共10小題，每小題4分，計40分。）

7．下列電池中不屬于二次電池的是

（）A．堿性鋅錳電池 B．鉛蓄電池

C．鎳鎘電池 D．鋰離子電池

8．有關原電池的工作原理中的下列說法中不正確的是

（）A．電池負極發生氧化反應

B．電池正極發生還原反應

C．電子流向是從負極流向正極（外電路）

D．電流方向是從負極流向正極（外電路）

9．原電池是將化學能轉化為電能的裝置，但其構成具有一定的條件，這些條件是（）。①電極（負極與正極：金屬活動性不同）、②電解質溶液、③閉合回路、④燈泡 A．①②③④

B．①②③

C．①②④

D．②③④

10．鋅電池可望代替鉛蓄電池，它的構成材料是鋅、空氣、某種電解質溶液，發生的總反應是2 Zn＋O2＝2ZnO。下列有關它的說法正確的是

（） A．鋅為電池負極，發生氧化反應

B．電解質溶液是酸性溶液

C．電池工作時，氧氣與鋅直接化合，生成氧化鋅

D．負極發生的反應是：Zn－2ｅ＋H2O＝ZnO＋2H＋

11．日常所用干電池其電極分別為碳棒和鋅皮，以糊狀NH4Cl和ZnCl2作電解質（其中加入MnO2氧化吸收H2），電極反應可簡化為：Zn－2ｅ＝Zn2＋；2NH4＋＋2e＝2 NH3＋H2（NH3再用于結合Zn2＋。）根據上述敘述判斷下列說法中正確的是

（）A．干電池中Zn為正極，碳為負極

B．干電池工作時，電子由Zn極經外電路流向碳極

C．干電池長時間連續使用時內裝糊狀物可能流出腐蝕電器

D．干電池可以實現化學能向電能的轉化和電能向化學能的轉化

12．某同學做完銅、鋅原電池的實驗后得出了下列結論，你認為正確的是

（）A．構成原電池正極和負極的材料必須是兩種金屬 B．由銅、鋅電極與硫酸銅溶液組成的原電池銅是負極

C．電子沿導線由鋅流向銅，通過硫酸溶液被氫離子得到而放出氫氣 D．銅鋅原電池工作時，鋅被硫酸溶解，所以才產生電子

13．燃料電池是一種新型電池，下列有關燃料電池的說法中正確的是

（）①優點之一是能量轉換率高

②優點之二是無污染

③缺點之一是需要持續的補充燃料

④缺點之二技術問題有待改進，尚未廣泛使用

A．①②③④ B．只有①② C．只有②③

D．只有②

14．下列反應中，在原理上可以設計成原電池的是

（）

A．Ba(OH)2?8H2O與NH4Cl的反應

B．鋁片與鹽酸的反應 C．甲烷與氧氣的反應

D．石灰 石的分解反應

15．某學生用下圖制作了原電池，其中正確的是

（）

16．現在各類堿性電池已經占有了越來越多的市場份額，這類電池廣泛地應用于各種小型用

電器（如照相機、收音機等）中。有一種新型的鋅錳電池就是這種堿性電池，它是在傳統鋅錳電池的基礎上改進的。下列對于堿性鋅錳電池的敘 述中正確的是

（）A．由于堿性物質的存在，這種電池的缺點是容易漏液失效 B．這種電池較傳統鋅錳電池使用壽命長

C．這種電池的電解質由傳統的KOH改進為NH4Cl D．這種電池的電解質由傳統的NH4Cl 改進為KOH 第Ⅱ卷（非選擇題

共42分）

三、填空題（計 42分）

17．（9分）原電池是一種把

轉化

的裝置。在原電池中，較活潑的金屬發生

反應，是

極，活潑性較差的金屬發生

反應，是

極。

18．（18分）利用生活中或實驗室中常用的物品，根據氧化還原反應知識和電學知識，自己動手設計一個原電池。請填寫下列空白：

（1）實驗原理：Fe＋2H＋＝Fe2＋＋H2↑。

（2）實驗用品：電極（、）、稀硫酸、（填寫所缺的實驗用品）、耳機（或者電流計）（3）實驗裝置

（4）原電池設計及注意的問題

①按如圖所示連接好實驗儀器，注意觀察（耳朵聽）耳機是否有聲音發出，如果沒有，可將原電池的兩個電極中的一極接觸耳機插頭上的一極（注意：接觸的同時耳機的另一個極是連接在原電池的另一個電極上的），這時可以聽見耳機發出“嚓嚓嚓????”聲音。其原因是：在原電池中，由化學能轉化為，在耳機中又由

轉化為聲音這種能量。

②如果將裝置中的耳機改為電流計，則鐵釘應該接電流計的極，電極反應是：

，發生了

反應；銅釘應該接電流計的 極，電極反應是：，發生了

反應。19．（8分）題目：化學電池在通訊、交通及日常生活中有著廣泛的應用。前常用的鎳（Ni）鎘（Cd）電池，其電池總反應可以表示為： Cd＋2NiO(OH)＋2H2O 2Ni(OH)2＋Cd(OH)2（1）已知Ni(OH)2 和Cd(OH)2均難溶于水但能溶于酸，放電就是使用電池的過程，充電 是給電池補充電量的過程。以下說法中正

確的是

① 以上反應不屬于置換反應

② 以上反應是復分解反應

③ 充電時化學能轉變為電能

④ 放電時化學能轉變為電能 A．①③

B．②④

C．①④

D．②③

（2）廢棄的鎳鎘電池已成為重要的環境污染物，有資料表明一節廢鎳錫電池可以使一平方米面積的耕地失去使用價值。在酸性土壤中這種污染尤為嚴重。這是因為

（3）另一種常用的電池是鋰電池（它是一種堿金屬元素，其相對原子質量為7，由于它的比容量（單位質量電板材料所能轉換的電量）特別大而廣泛應用于心臟起搏 器，一般使用的時間可長達十年。它的負極用金屬鋰制成；電池總反應可表示為：Li＋MnO2→LiMnO2試回答：鋰電池比容量特別大的原因是

鋰電池中的電解質溶液需用非水溶劑配制，為什么這種電池不能使用電解質的水溶液？請用化學方程式表示其原因

（4）下圖是廢棄鎳鋼電池中的重金屬滲入水體后，進入人體的一條途徑：

生物體D中重金屬濃度

（大于、等于、小于）生物體A中重金屬濃度，這是通過食物鏈

作用所引起的。除上述途徑外，被污染水體中的重金屬還可以直接通過

（途徑）_________進入人體。

（5）下圖是兩個電池外殼上的說明文字某型號進口電池

某型號進口電池 某型號國產電池 RECHARGEABLE 1.2V 500mAh STANDARD

CHARGE 15h at 50mA GNY 0.6（KR－AA）1.2V 600mAh RECHARGE ABLESTANDARD CHARGE 15h at 60mA 上述進口電池的電動勢是

伏。上述國產電池最多可放出

毫安時的電量；若該電池平均工作電流為0.03安，則最多可使用

小時。20．（7分）在由銅鋅組成的原電池（電解質是稀硫酸）中，有位同學在銅電極收集到了56mL標準狀況下的氣體，試問：①銅電極產生56mL氣體的過程中有多少摩爾的鋅溶解？②銅電極產生56mL氣體的過程中有多少摩爾的電子發生了轉移？

第三篇：高中英語必修1,說課稿

Good afternoon, dear teachers.My name is xxxx , I come from Kaifeng,a beautiful and historic city.I got my bachelor’s degree in English two years ago in xxxxUniversity.Now I’m a postgraduate student majoring in translation theory and practice.Since primary school I have a dream of becoming a teacher in the future because most of my teachers were very kind to me.They helped me a lot and I want to be someone like them one day.In this semester I took a part-time job as an English teacher in Zhengzhou University.I find that I am good at getting along with students and they like me very much.So this pleasant teaching experience strengthened my determination to become a teacher after graduation.I am standing here knowing that today’s interview is the basic foundation to be a teacher.I will try my best to perform well.Now I’d like to talk about my teaching ideas.The teaching material I’m going to talk about is taken from NSEFC book one.It’s the reading part of unit one---Anne’s Best Friend.My presentation consists of three parts: Part 1 is analysis of the teaching material, part 2 is my teaching methods and the last part is teaching procedures.Part 1.Analysis of the teaching material In this part, I’ll talk about my understanding of the teaching material, teaching objectives, key and difficult points.a)my understanding of the teaching material

The topic of unit 1 is friendship, a very familiar topic for students.The reading text---Anne’s best friend shows Ss a special kind of friendship, friendship between a girl and her diary.By reading the text, Ss can not only improve their language knowledge and ability, increase their awareness of the importance of friendship but also acquire some cultural and historic knowledge about the Jewish people and German Nazis.teaching objectives According to the teaching material, I set three teaching objectives.Knowledge objective: help Ss memorize and learn the usage of some important words, expressions,and grammatical structures like “it’s the first time that”, and broaden their knowledge of the Jewish people’s sufferings in the history.Ability objective: to train Ss’s reading ability such as fast reading, intensive reading, and information-gathering and summarizing ability.Moral objective: by studying the text, Ss would be able to understand the importance of friendship, learn to cherish and maintain friendship b)Key and difficult points The key point is to get Ss familiar with the usage of important words, expressions and

the difficult point is to help Ss master some complex grammars, such as the word it used as formal subject and present participle used as attributes.Part 2 my teaching theories, methods and aids: Ss should always be put in the predominant position of learning and teachers should play a leading role in instruction.Therefore, I will use question-and-answer activity teaching method, free discussion and pair work method to inspire Ss’s self-learning.During the class, I will draw Ss’s attention to important points by asking them some questions and let them find answers by themselves.They will learn important and difficult points through analyzing, discussion and summarizing.As for teaching aids, I will use OHP(overhead projector), PowerPoint, and tape recorder.Part 3 teaching procedures Step 1: lead-in and pre-reading(Unit 1)First, I’ll ask Ss some questions about their friends---“who is your best friend?” “What do you like most about your friends?” “Are you good to your friends?” then I will ask Ss to do the warming-up exercise.After that I will let them discuss in groups about their answers.After their discussion I will acquaint them with some background knowledge about German Nazis and the Jewish history to get them prepared for reading the text.Then we will move on to: Step 2 while-reading This step is divided into 2 parts---fast reading and careful reading.Before fast reading I will ask them some simple questions about the details in the text.These questions serve as clues for them to follow while reading and will help improve their skimming skills.Then I will ask them to read the texts again and retell or summarize the reading material.Step 3 post-reading and extension In this part students are instructed to focus on language usage and background knowledge.I will explain the usage of some key words, expressions and grammatical structures and also help them better understand the true meaning of friendship.Step 4 homework I will ask Ss to finish the exercise on Page 4 and 5/to consolidate what we have learnt.Also they are required to review the learnt lesson and underline the key words and phrases in the next text.第二課

Now I’d like to talk about my teaching ideas.The teaching material I’m going to talk about is taken from NSEFC book one.It’s the reading part of unit two The Road to Modern English My presentation consists of three parts: Part 1 is analysis of the teaching material, part 2 is my teaching methods and the last part is teaching procedures.Part 1.Analysis of the teaching material In this part, I’ll talk about my understanding of the teaching material, teaching objectives, key and difficult points.a)my understanding of the teaching material

The topic of unit 2 is English language and its development.The reading text---The Road to Modern English tells about the development of English language in history and different English dialects.By reading the text, Ss can not only improve their language knowledge and ability, but also acquire some cultural and historic knowledge about English dialects.teaching objectives According to the teaching material, I set three teaching objectives.Knowledge objective: help Ss memorize and learn the usage of some important words, expressions of racial discrimination in history.the difficult point is to make Ss fully understand the reading text by adding background knowledge

Part 2 my teaching theories, methods and aids: Ss should always be put in the predominant position of learning and teachers should play a leading role in instruction.Therefore, I will use question-and-answer activity teaching method, free discussion and pair work method to inspire Ss’s self-learning.During the class, I will draw Ss’s attention to important points by asking them some questions and let them find answers by themselves.They will learn important and difficult points through analyzing, discussion and summarizing.As for teaching aids, I will use OHP(overhead projector), PowerPoint, and tape recorder.Part 3 teaching procedures Step 1: lead-in and pre-reading First, I’ll give Ss some examples of English dialects, such as football and soccer, shop and store, and let Ss guess whether they belong to British dialect or American dialect.Then I will them videos taken from American and British movies.From the videos Ss could compare and discuss the differences between American accent and British accent.After their discussion I explain to them how these differences occur to get them prepared for reading the text.Then we will move on to : Step 2 while-reading This step is divided into 2 parts---fast reading and careful reading.Before fast reading I will ask them some simple questions about the details in the text.These questions serve as clues for them to follow while reading and will help improve their skimming skills.Then I will ask them to read the texts again and retell or summarize the reading material.Step 3 post-reading and extension In this part students are instructed to focus on language usage and background knowledge.I will explain the usage of some key words, expressions and grammatical structures andalso help them better understand how English language developed throughout the history and its role in modern society Step 4 homework I will ask Ss to finish the exercise on Page 11 and 12to consolidate what we have learnt.Also they are required to review the learnt lesson and underline the key words and phrases in the next text.Untie three

Now I’d like to talk about my teaching ideas.The teaching material I’m going to talk about is taken from NSEFC book one.It’s the reading part of unit three Journey Down the Mekong

My presentation consists of three parts: Part 1 is analysis of the teaching material, part 2 is my teaching methods and the last part is teaching procedures.Part 1.Analysis of the teaching material In this part, I’ll talk about my understanding of the teaching material, teaching objectives, key and difficult points.b)my understanding of the teaching material

The topic of unit 3 is travelling.The reading text---Journey Down the Mekong is taken from a travel journal by a boy named Wang Kun.It describes he and his sister’s dream and their travel plan.By reading the text, Ss can not only improve their language knowledge and ability, but also acquire some geographic knowledge about Mekong River.teaching objectives According to the teaching material, I set three teaching objectives.Knowledge objective: help Ss memorize and learn the usage of some important words, expressions ever since, persuade, make up one’s mind and emphatic pattern

Ability objective: to train Ss’s reading ability such as fast reading, intensive reading, and information-gathering and summarizing ability.Moral objective: by studying the text, Ss would be able to appreciate the beauty of rivers and other landscapes in our country and understand the importance of nature to our life, and therefore enhance their awareness of environmental protection.c)Key and difficult points The key point is to get Ss familiar with the usage of important words, expressions andthe difficult point is to help Ss master some important grammars, such as the emphatic pattern and present participle used as accompany adverbial.Part 2 my teaching theories, methods and aids: Ss should always be put in the predominant position of learning and teachers should play a leading role in instruction.Therefore, I will use question-and-answer activity teaching method, free discussion and pair work method to inspire Ss’s self-learning.During the class, I will draw Ss’s attention to important points by asking them some questions and let them find answers by themselves.They will learn important and difficult points through analyzing, discussion and summarizing.As for teaching aids, I will use OHP(overhead projector), PowerPoint, and tape recorder.Part 3 teaching procedures Step 1: lead-in and pre-reading First, I’ll ask Ss some questions related to the reading text.for example “have you ever travelled to some beautiful rivers in China?” I will spare 3 minutes for them to discuss with each other and answer my questions.Then I will show them some pictures of important rivers in the world and the map of Mekong River to arouse their interest in reading the text.Then we will move on to : Step 2 while-reading This step is divided into 2 parts---fast reading and careful reading.Before fast reading I will ask them some simple questions about the details in the text.These questions serve as clues for them to follow while reading and will help improve their skimming skills.Then I will ask them to read the texts again and retell or summarize the reading material.Step 3 post-reading and extension In this part students are instructed to focus on language usage and background knowledge.I will explain the usage of some key words, expressions and grammatical structures and also, to train their summarizing ability, I will ask them to describe the characteristics of Wang Kun and his sister.Step 4 homework I will ask Ss to finish the exercise on Page 20 and 21

to consolidate what we have learnt.Also they are required to review the learnt lesson and underline the key words and phrases in the next text.Untie four

Now I’d like to talk about my teaching ideas.The teaching material I’m going to talk about is taken from NSEFC book one.It’s the reading part of unit four A Night the Earth Didn’t Sleep

My presentation consists of three parts: Part 1 is analysis of the teaching material, part 2 is my teaching methods and the last part is teaching procedures.Part 1.Analysis of the teaching material In this part, I’ll talk about my understanding of the teaching material, teaching objectives, key and difficult points.d)my understanding of the teaching material

The topic of unit 4 is basic knowledge about earthquakes and how to protect oneself and help others in disasters.The reading text---A Night the Earth Didn’t Sleep describes the Tangshan earthquake.By reading the text, Ss can not only improve their language knowledge and ability, but also acquire some knowledge about earthquake.teaching objectives According to the teaching material, I set three teaching objectives.Knowledge objective: help Ss memorize and learn the usage of some important words, expressions as if, the number of and attributive clause and enlarge their knowledge of earthquake

Ability objective: to train Ss’s reading ability such as fast reading, intensive reading, and information-gathering and summarizing ability.Moral objective: by studying the text, Ss would be able to encourage Ss to help each other in disaster and recognize the signs of earthquake.e)Key and difficult points The key point is to get Ss familiar with the usage of important words, expressions and1.the the difficult point is to let students master the use of attributive clause Part 2 my teaching theories, methods and aids: Ss should always be put in the predominant position of learning and teachers should play a leading role in instruction.Therefore, I will use question-and-answer activity teaching method, free discussion and pair work method to inspire Ss’s self-learning.During the class, I will draw Ss’s attention to important points by asking them some questions and let them find answers by themselves.They will learn important and difficult points through analyzing, discussion and summarizing.As for teaching aids, I will use OHP(overhead projector), PowerPoint, and tape recorder.Part 3 teaching procedures Step 1: lead-in and pre-reading First, I’ll let Ss watch a video taken from the movie Tangshan Earthquake as an introduction to the topic of the reading text.Then I will ask Ss some questions related to the topic, such as “do you know why earthquake happens?” “What will you do if an earthquake happens?” “What should we do to help those in quake-hit areas?”

I will give Ss 5 minutes to talk about these questions in pairs or in groups.Then we will move on to: Step 2 while-reading This step is divided into 2 parts---fast reading and careful reading.Before fast reading I will ask them some simple questions about the details in the text.These questions serve as clues for them to follow while reading and will help improve their skimming skills.Then I will ask them to read the texts again and retell or summarize the reading material.Step 3 post-reading and extension In this part students are instructed to focus on language usage and background knowledge.I will explain the usage of some key words, expressions and grammatical structures and also let them list the some earthquake precursors, self-rescue measures and measures to help others in disaster.Step 4 homework I will ask Ss to finish the exercise on Page 28 and 29to consolidate what we have learnt.Also they are required to review the learnt lesson and underline the key words and phrases in the next text.Unite five Now I’d like to talk about my teaching ideas.The teaching material I’m going to talk about is taken from NSEFC book one.It’s the reading part of unit five ELIA’S STORY My presentation consists of three parts: Part 1 is analysis of the teaching material, part 2 is my teaching methods and the last part is teaching procedures.Part 1.Analysis of the teaching material In this part, I’ll talk about my understanding of the teaching material, teaching objectives, key and difficult points.my understanding of the teaching material

The topic of unit 5 is the qualities of a great person and the lives of some great people.The reading text---ELIA’S STORY is the self-narration by a man named Elias.He describes how Nelson Mandela helped him and fought for the rights of black people.By reading the text, Ss can not only improve their language knowledge and ability, but also learn the good qualities of Nelson Mandela and how people fought for racial equality.teaching objectives According to the teaching material, I set three teaching objectives.Knowledge objective: help Ss memorize and learn the usage of some important words, expressions and attributive clause and enlarge their knowledge of racial discrimination in history.Ability objective: to train Ss’s reading ability such as fast reading, intensive reading, and information-gathering and summarizing ability.Moral objective: by studying the text, Ss would be able to learn from the great people and cultivate them good qualities and attitudes towards life and work.f)Key and difficult points The key point is to get Ss familiar with the usage of important words, expressions and the difficult point is to let students master the use of attributive clause Part 2 my teaching theories, methods and aids: Ss should always be put in the predominant position of learning and teachers should play a leading role in instruction.Therefore, I will use question-and-answer activity teaching method, free discussion and pair work method to inspire Ss’s self-learning.During the class, I will draw Ss’s attention to important points by asking them some questions and let them find answers by themselves.They will learn important and difficult points through analyzing, discussion and summarizing.As for teaching aids, I will use OHP(overhead projector), PowerPoint, and tape recorder.Part 3 teaching procedures Step 1: lead-in and pre-reading First, I’ll show Ss some pictures of great people in the world and ask them how much do they know about these people.Then I will ask them some questions related to the topic.“Do you know some other famous people?” “Among these great people who do you like best?” “What qualities do these great people have in common?” I will give Ss 5 minutes to talk about these questions in pairs or in groups.Then we will move on to: Step 2 while-reading This step is divided into 2 parts---fast reading and careful reading.Before fast reading I will ask them some simple questions about the details in the text.These questions serve as clues for them to follow while reading and will help improve their skimming skills.Then I will ask them to read the texts again and retell or summarize the reading material.Step 3 post-reading and extension In this part students are instructed to focus on language usage and background knowledge.I will explain the usage of some key words, expressions and grammatical structures and help them summarize the great qualities of Nelson Mandela and explain to them the painstaking efforts that black people made to fight for their rights throughout history.Step 4 homework I will ask Ss to finish the exercise on Page 36 and 37 to consolidate what we have learnt.Also they are required to review the learnt lesson and underline the key words and phrases in the next text.

第四篇：人教新課標高中英語必修1 Unit 2教案(含六課時)

人教新課標高中英語必修1教案（含六課時）

Unit 2: English Around the World Ⅰ單元教學目標

技能目標Goals

Talk about English and its development, different kinds of English.Talk about difficulties in language communication.Learn to make dialogue using request and commands.Learn to transfer from direct speech and indirect speech.Learn to give opinions and organize ideas by way of brainstorming.Learn to make a poster showing your ideas clearly.Ⅱ單元目標語言

功能句式

Talk about English and its development，Refer to the introduction in the teachers’ book.Talk about difficulties in language communication.Different speakers may come from different places, so they may use different words and dialects, such as subway and underground railway, left-hand-side and on the left, two blocks and two streets.Make dialogue using request and commands:

Pardon? Could you repeat that, please?

I beg your pardon? Can you speak more slowly, please?

I don’t understand.Sorry, I can’t follow you.Could you say that again, please? How do you spell it, please?

詞匯

1.四會詞匯

Include role international native elevator flat apartment rubber petrol gas modern culture AD actually present(adj.)rule(v.)vocabulary usage identity government Singapore Malaysia rapidly phrase candy lorry command request retell polite boss standard midwestern southern Spanish eastern northern recognize accent lightning direction subway block 2.認讀詞匯

Shakespeare Noah Webster Lori dialect Houston Texas Butord Lest catfish 3.固定詞組

Play a role(in), because of, come up, such as 語法

Command & request Open the door.Please Open the door.Would you please open the door.Direct and indirect speech He told(asked)me to open the door.Ⅲ.單元教材分析和教材重組 1.教材分析

本單元的中心話題是“English language and its development, different kinds of English”.通過對世界英語這一話題的探討，加強學生對英語語言的了解，對當代語言特別是英語發展趨勢的了解，世界在發展，時代在前進，語言作為交流的工具，也隨著時代的發展而變化，由于英語在世界上的廣泛應用，它不斷吸收、交融、容納、創新，這就形成了各種各樣帶有國家、民族、地區特色的英語。盡管如此，我們還是要通過本單元課文的學習讓同學們感受、了解美國英語、澳大利亞英語、印度英語、新加坡英語等都有自己的規律和習慣用法和不同發音規則。

1.1 Warming up簡要介紹了世界英語的分支以及英語語言在不同國家產生的差異，使學生感受英語語言的多文化、多層次、多元性，對英國英語和美國英語的不同有一個初步的了解。

1.2 Pre –reading通過兩個問題引發學生對課文主題的思考，以便參與課堂活動。

1.3 Reading 簡要地說明英語語言的起源、發展變化、形成原因，以及它的發展趨勢。1.4 Comprehending 主要是檢測學生對課文基本內容的理解程度。

1.5 Learning About the Language 主要通過各種練習幫助學生重溫本單元前幾個部分所學的新單詞和短語，同時也通過新的例子展現了美國英語、英國英語的差異，并著重介紹了本單元的語法項目（Request &Command and Indirect Speech）

1.6 Using Language其中的reading and talking主要介紹了當今世界各地英語有自己的特色，即使是美國東西部、南北部、說話均有所不同。為了幫助培養跨文化意識，可以讓學生學完課文后討論中國的方言，使他們感受到本國的文化差異。2.教材重組

2.1 導入 把Warming Up作為一堂課。

2.2 精讀 把Pre-reading, Reading和 Comprehending整合在一起作為一堂精讀課

2.3 語言學習把Learning About the Language 和Workbook 中的Using Structures結合在一起。

2.4寫作

2.5聽和說 把課文中的聽和說整合成一堂課。

2.6練習課 workbook exercise & other exercise 3.課型設計與課時分配

st period Warming Up nd period Reading & Language Study rd period Learning About the Language & grammar th period Writing th period Listing & Speaking th period Exercise

Unit 2 English around the World Period One

Warming Up

一、教學目標（teaching aims）1.能力目標（ability aim）

a.Enable students to talk about the world English b.Enable students to talk about the differences between Am.English and Br.English 2.語言目標(language aim)More than;include;play an important role;because of;international;native;elevator;flat;apartment;rubber;petrol;gas

二、教學重難點（Teaching important points and difficult points）

a.Students learn about the World English and the differences between Am.English and Br.English b.Students can understand the jokes caused by the misunderstanding of different English.三、教學方法（Teaching Methods）

a.Individual, pair or group work to finish each task.b.listening c.Discussion

四、教具（Teaching aids）

A computer;a tape-recorder;a projector

五、教學步驟（Teaching procedure）Step 1.Leading-in Fun time: warm the students up by asking them to greet each other with their dialects.At the same time, lead the students to thing about the topic of this unit---“language”.Step 2.Warming Up 1)A quiz about the national flag of countries speaking English as their first or second language.Lead the students to the topic “English Around the World”.2)Ask the students to think about the question about the “world Englishes”.Step 3.Talking about “world Englishes”, especially the differences between Am.English and Br.English.1)Listen to a dialogue between an American and an Englishman.And try to find out the cause of the misunderstanding between them.2)Talk about the differences between Am.English and Br.English.(mainly about vocabulary and spelling)Step 4.Speaking task Student make up a dialogue with a misunderstanding caused by the differences between Am.English and Br.English like the dialogue they listened to

六、作業

七、板書設計

八、反思

Unit2 English Around the World Period Two Reading

一、教學目標（teaching aims）

Get the students to know English language and its development and different kinds of English through this passage.教學內容（Teaching contents）

Get the knowledge of English language and its development and different kinds of English.能力目標（ability aim）

Get some knowledge of different kinds of English.語言目標(language aim)Grasp some words and expressions: such as;play a role in;because of;come up;play a part in.Learn the grammar: the indirect speech of the imperative clause.二、教學重難點（Teaching important points and difficult points）The indirect speech of the imperative clause.三、教學方法（Teaching Methods）Task-based approach

四、教具（Teaching aids）Multi-media computer

五、教學步驟（Teaching procedure）Step 1.Warming Up Warm the students up by asking then to tell the differences between Am.English and Br.English Step 2.Pre-reading Ask the students to discuss some questions about “English” in pairs.1.How many people speak English in the world today? 2.Why do some people speak English? 3.What has helped to spread English around the world? 4.Do you think it important for Chinese to learn English? Why? Step 4.Reading 1)The First-reading Ask the students to scan the text and choose the correct answer in the book.2)The second reading Ask the students to read the text paragraph by paragraph, and get some detail information.a.For the first and second paragraph, students answer some questions.b.For the third paragraph, students find out the information to fill in the table of the development of English.c.For the last paragraph, students find out the reason why Indians speaks English.Step 4.Discussion 1.Do you think it matters what kind of English you learn? Why? 2.Why do you think people all over the world want to learn English? 3.Do you think Chinese will become the most popular language in the world instead of English in the future? Step 5.Extension Give the students some information of origin of Am.English and Br.English.六、作業（Homework）

1.Finish the exercise on page 10.2.Read passage on page 51

七、板書設計

八、反思

Unit 2 English Around the World Period Three Learning about the Language

一、教學目標（teaching aims）1.能力目標（ability aim）

a.Enable students to tell the differences between a request and a command.b.Enable students to learn about the Indirect Speech(request & command).c.Enable students to use about the Indirect Speech(request & command).2.語言目標（Language aim）

Command;request;retell;polite;boss Indirect Speech(request & command)

二、教學重難點（Teaching important points and difficult points）a.Students learn about the differences between a request and a command.b.Students learn about the Indirect Speech(request & command).c.Students can use about the Indirect Speech.三、教學方法（Teaching Methods）

a.Individual, pair or group work to finish each task.b.discovering the structure through examples.c.Practice

四、教具（Teaching aids）A computer, a projector

五、教學步驟（Teaching procedure）Step1.Warming-Up(Revision)Warm the students up by asking them to go over the direct speech and the indirect speech.Do some exercise: change a statement or a question into indirect speech.Step2.Talk about Request and command.1)Talk about the polite and impolite tune.2)Change the commands into requests.3)Learn to give requests or commands according to the situations.Step3.Talk about hoe to change a request and a command into indirect speech.Ask(ed)sb.(not)to do sth.Tell/told sb.(not)to do sth.Step4.Practise change a request or command into indirect speech.Step5.Using the structure A game: Choose two students act two robots.One listens to the requests, the other listens to the commands.Other students give either requests or commands, and the robots do what the students asked them to do.六、作業（Homework）

七、板書設計

八、反思

Unit 2 English Around the World Period Four Writing

一、教學目標（Teaching aims）

a.Let students get to know how to write a statement by using brainstorming b.Try to use connecting words or sentences to make it as an essage or passage not just several sentences 教學內容（Teaching contents）Write a statement 能力目標（Ability aim）

Use the brainstorming way to connect sentences and then arrange them properly.語言目標（Language aim）I think’ I believe’

In my opinion, We learn English to……

二、教學重難點（Teaching important and difficult points）How to arrange sentences correctly.Try to use connecting words.三、教學方法（Teaching methods）Brainstorming way

四、教具（teaching aids）Multi-media computer

五、教學步驟（Teaching procedure）Step1.Lead-in Use the brainstorming way to ask students “Why should we live?”which is a simple question,at the same time there might be various answers to the question, which will stimulate their interest.Step2 Presentation Also use the brainstorming way to ask “Why should we learn English?” and “how can learning English help China?” Step3 A poster Write a poster to collect all their ideas, try to use complete sentences, such as: I like to study English use it for business in the future.I want to study English well so that I can read English books.Say, come to the blackboard and write down your ideas, try to use complete sentences, Such as: If I learn English well,I can bring in the advanced foreign technology to Ching, so China will become stronger.I decide to learn English well.In this case I canard English novels, so I can translate them inro Chinese, then more Chinese can know more things about the world.Step4.Write a essay The title is “Do we need to learn English?”

Step5.Display the structure on how to write the essay.1.State your point of view.2.Show the supporting reasons.3.Get a conclusion Step6.Show them the connecting words which can help them to join the sentence and paragraphs.Illustration: I think, I believe, In my opinion, As far as I am concern…… Addition: firstly, secondly, then, besides, at last…… Contrast: however, but, on the other hand…… Summary: in short, in a word, therefore, so……

Step7.Give them a simple example which is not complete Do we need to learn English? I strongly think we not only need to learning English but also learn it well……why should we learn it……How can Learning English help China in the future?......六、作業（Homework）

七、板書設計

八、反思

Unit 2 English Around the World Period Five Listening & Speaking

一、教學目標（Teaching aims）

教材(Teaching materials)listening materials on P12 and P14 on the textbook, another one attached 能力目標（ability sim）

Enable students to catch the listening materials and understand them and distinguish American and British English, try to use them in dialogues.語言目標（Language aim）

Distinguish some words used in American and British English, and some dialect and accent.二、教學重難點（Teaching important and difficult points）

Understand words used in American and British English which have the meanings and some dialect accents.三、教學方法（Teaching methods）Listening and talking

四、教具（Teaching aids）

Tape recorder and get students answer sheet printed out

五、教學步驟（Teaching procedure）Step1.Listening Textbook P14 Listen to the tape, getting to know American dialect and accent.Step4.Speaking After listen to different dialects and accents, see if students know how to pronounce the following words: Ask, after, either, neither, kilometer, box,…..Step3.Listening Do exercise.六、作業（Homework）

七、板書設計

八、反思

Unit 2 English Around the World Period Six Exercise

一、教學目標（Teaching aims）Finish the exercise on the workbook 1.能力目標（Ability aim）

a.Enable the students to command “commands and requests” b.Through cooperative work find out correct answer themselves.2.語言目標（Language aim）Full understanding of the readings.二、教學重難點（Teaching important and difficult point）Understand the main ideas of the passage.三、教學方法（Teaching method）a.Fast and careful reading b.Individual, pair or group work to finish each task.c.Discussion

四、教具（Teaching aids）A computer

五、教學步驟（Teaching procedure）Step1.Warming up Step2.Speaking task(Review commands and requests)Offer them situations and try to make dialogue with commands and requests.Step3.Do the “Reading”on P13 and answer questions on it briefly.Step4.Finish the “Reading task”on P51 and complete the form after it.Step5.Group work Ask them to sum up what codes and short forms of words they often use when they often chat in the net wuth others.Step6.Check up their researching result.六、作業（Homework）

七、板書設計

八、反思

第五篇：17_《牛頓第二定律》教案(新人教必修1)

牛頓第二定律

教學目標：

一、知識目標

1．理解加速度與力和質量的關系；

2．理解牛頓第二定律的內容，知道定律的確切含義；

3．知道得到牛頓第二定律的實驗過程。

二、能力目標

培養學生的實驗能力、分析能力和解決問題的能力。

三、德育目標

使學生知道物理中的一種研究問題的方法——控制變量法

教學重點

1．牛頓第二定律的實驗過程；

2．牛頓第二定律。

教學難點

牛頓第二定律的意義。

教學方法

實驗法、講授法、歸納法

教學用具

兩輛質量相同的小車，光滑的水平板（一端帶有定滑輪）；砝碼（一盒），細繩、夾子 課時安排 2課時

教學過程

一、導入新課

1．提問：什么是物體運動狀態的改變？物體運動狀態發生改變的原因是什么？

2．引入新課：

通過上節課的學習，我們已知道：物體運動狀態改變時產生加速度，而產生的加速度又和物體的質量及所受力的大小有關，那么：加速度跟物體所受力的大小及物體質量之間有什么關系呢？本節課我們就來研究這個問題。

二、新課教學

（一）用投影片出示本節課的學習目標：

1．理解加速度與力的關系；

2．理解加速度與質量的關系

3．理解牛頓第二定律的內容。

（二）學習目標完成過程：

1、加速度和力的關系：

（1）用投影片出示本節課所用的實驗裝置，教師進行講解：圖中是兩輛質量相同的小車，放在光滑的水平板上，小車的前端各系上細繩，繩的另一端跨過定滑輪各掛一個小盤，盤里放有數量不等的砝碼，使兩輛小車在不同的拉力下做勻加速運動。

（2）對本次實驗中說明的兩個問題

a：砝碼跟小車相比質量較小，細繩對小車的拉力近似地等于砝碼所受的重力。

b：用一只夾子夾住兩根細繩，以同時控控制兩輛小車。

（3）實驗的做法：

a：在兩砝碼盤中放不同數量的砝碼，以使兩小車所受的拉力不同。

高考資源網 2006精品資料系列

b：打開夾子，讓兩輛小車同時從靜止開始運動，一段時間后關上夾子，讓它們同時停下來。

（4）需觀察的現象，觀察兩輛車在相等的時間里，所發生的位移的大小。（實驗現象：所受拉力大的那輛小車，位移大）

（5）分析推理：

a：由公式s1?at2得到在時間t一定時，位移s和加速度a成正比；

2b：由實驗現象得到：小車的位移與他們所受的拉力成正比。

c：推理得到結論：對質量相同的物體，物體的加速度跟作用在物體上的力成正比，即：

a1F1?或a?F a2F2a1F1?a2F2

（6）鞏固練習：

a．據得到：要使物體在短時間內速度的改變很大，即加速度很大，就必須給物體提供。

b．競賽用的小汽車，要求起動后幾秒鐘內速度由零達到60m/s以上，他們為什么要裝備功率很大的發動機？

2：加速度和質量的關系：

（1）實驗裝置同上；

（2）說明與前次實驗的不同。

前一次實驗中，我們是保持小車質量不變，而改變小車所受力的大小，來研究加速度和力之間的關系的。

本次實驗是使兩輛小車所受拉力相同，而在一輛小車上加放砝碼的，以增大質量，研究加速度和質量之間關系的。

（3）實驗現象：

在相同的時間里，質量小的那輛小車的位移大。

（4）分析推理，得到結論：

在相同的力作用下，物體的加速度跟物體的質量成反比，即

a1/a2=m2/m1或a∝m3：牛頓第二運動定律

（1）綜合上述實驗中得到的兩個關系，得到下述結論：

物體的加速度跟作用力成正比，跟物體的質量成反比，且加速度的方向跟引起這個加速度的力的方向相同。

（2）公式表示：

a∝F或者F∝ma m即：F=kma

a：如果每個物理量都采用國際單位，k＝1；

高考資源網 2006精品資料系列

b：力的單位（牛頓）的定義：使質量為1千克的物體產生1m/s2的加速度的力叫做1牛頓。

（3）推廣：上面我們研究的是物體受到一個力作用的情況，當物體受到幾個力作用時，上述關系可推廣為：

物體的加速度跟所受的合力成正比，跟物體的質量成反比，加速度的放心跟合力的方向相同。即F合＝ma。

（4）介紹F合和a的瞬時對應關系

a：只有物體受到力的作用，物體才具有加速度。

b：力恒定不變，加速度也恒定不變。

c：力隨著時間改變，加速度也隨著時間改變。

d：力停止作用，加速度也隨即消失。

4：例題分析（課本例題）

（1）學生閱讀例題內容

（2）分析：

??質量m已知???必須先求F1和F2的合力，而合力的大小可

要求物體的加速度?以用作圖法求解，也可以用計算法求解。

（3）用投影片展示解題過程：

如圖所示，建立平面直角坐標系，把力F1和F2分別沿x軸和y軸的方向分解F1的兩個分力為：

F1x?F1xcos60o,F2y?F2sin60o

F2的兩個分力為：F2xo?F2cos60o,F2y?F2sin60

F1y和F2y大小相等，方向相反，相互抵消，F1x和F2x的方向相同，所以：

F合?F1x?F2x?F1cos60o?F2cos60o?5N?5N?10N

已知合力F合和質量m，據F合＝ma，即可求得：

10Na?F合??5m/s2

2kg

三：小結

1：本節課的研究方法——控制變量法

2：牛頓第二運動定律確定了a和F之間的大小關系，也確定的a和F的方向關系

3：求解合力時，可采用建立平面直角坐標系，將各個力沿x軸和y軸分解，最后求合力的方法。

高考資源網 2006精品資料系列

四、作業

課本P53練習二

五、板書設計：

?定律的實驗條件（控制變量法）??

1、m一定時，a?F???1???

2、F一定時，a?m? ??

3、把F?ma改寫成，在F,m,a取國際單位的?????條件下k?1??牛頓第二定律?內容：物體運動的加速度與合外力成正比，與質量成反比，且?加速度與合外力方向相同???F合和a的方向關系??1N?1kgm/s2?單位關系：???物理意義：?瞬時對應關系??因果對應關系???

?

高考資源網 2006精品資料系列