第一篇：高中英语 Unit 5 Nelson Mandela a modern heroPeriod Two课时作业 新人教版必修1
Period Two Learning about Language Ⅰ.阅读理解
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(基础)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(独特的)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.【语篇解读】 不管将来是否从事科学研究，每一个孩子都需要接受科学教育，不仅因为科学和我们的日常生活密切相关，而且学习科学会为他们未来的成功奠定基础。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 细节理解题。根据第二段最后的“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，这些游戏都有科学的成分，能教给孩子们科学知识。] 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 主旨大意题。通读本段可知，本段主要讲孩子天生对这个世界好奇，而科学可以满足他们的好奇心，而教给他们科学知识的最好方法是让他们玩科学玩具，故选C项。] 3．The text is most probably written for ________．
A．parents
B．scientists
C．children
D．teachers 答案 A 推理判断题。该文讲述了孩子接受科学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，本文的写作对象最有可能是家长。]
B
Wong Fuk-wing，a Hong Kong volunteer(志愿者)at an orphanage(孤儿院)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(悲剧的)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”． 【语篇解读】 本文介绍了香港义工黄福荣——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 细节理解题。本文第二、三段介绍了阿福地震中救人牺牲的事迹，故选B项。] 5．The underlined word “deter” in Para.5 refers to “________”．
A．prevent C．beat
B．refuse D．encourage 答案 A 词义猜测题。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...”可以看出严重的疾病也未能阻止他去汶川地震灾区当一名志愿者。] 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 推理判断题。阿福从2002年开始做义工，不顾自身疾病参与汶川地震和玉树地震的援救工作，并在玉树地震中献出生命。从他的事迹不难看出，阿福是一个热心而无私的人。]
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(峰顶)from the Tibetan side.On the same day，a Nepali(尼泊尔的)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(大本营)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.【语篇解读】 本文是一篇新闻。一名13岁的美国男孩成功登上了珠穆朗玛峰的峰顶，轰动了世界。
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 细节理解题。根据第四段的“The climbing...reaching his goal of climbing the highest mountains on all seven continents(大洲)．”可知，乔丹攀登珠穆朗玛峰的主要目的是要实现他的梦想——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 细节理解题。根据最后一段可知，从珠峰的中国境内攀爬有两个原因，一是没有最小年龄限制，二是危险较小(他的父亲这样认为)。故选A项。] 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 细节理解题。由第二段最后一句可知A项错误；由第五段第二句可知B项错误；由第一段第一句话可知C项错误；由第二段第二句可知D项正确。]
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 主旨大意题。本文是一篇新闻，报道了一名13岁的美国男孩登上了珠穆朗玛峰顶，成为世界上最年轻的成功登顶珠峰的人。故B项最能概括本文大意。] Ⅱ.根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
__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(处罚)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：高一化学必修1 课时作业
高一化学必修1 课时作业
一、选择题（只有1个正确答案；共6小题，每小题3分，共18分。）
1．下列关于电能的特点叙述中错误的是
（）A．电能较其它能源使用方便
B．电能在现代社会中的使用最为广泛 C．电能使用导致的污染小
D．电能是化学能与各种能量转化中利用率最高的2．下面的能源中属于二次能源的是
（）A．电能、蒸汽 B．电能、风能 C．蒸汽、风能 D．煤、石油
3．三峡工程水电站装机总容量是1820万千瓦，这将给中国电网带来历史性变革，有利于全国电力联网和西电东输工程。目前在我国发电总量中的比例最大的是
（）
A．水电（水力发电）
B．火电（火力发电）
C．核电（核能发电）
D．风电（风力发电）
4．火力发电是通过化石燃料燃烧，使化石燃料中化学能转化为电能，其能量转化方式正确 的是
（）A．化学能 → 电能
B．化学能 → 机械能 →电能
C．化学能 → 热能 →电能
D．化学能 → 热能
→ 机械能 →电能
5．现在电池的种类非常多，且由电池造成的污染越来越严重，下列电池不会造成环境污染的是
（）
A．锂电池
B．锌锰电池
C．氢氧燃料电池
D．镍镉电池
6．化学电池可以直接将化学能转化为电能，化学电池的本质是
（）A．化合价的升降
B． 电子的转移 C．氧化还原反应 D．电能的储存
二、选择题（有1—2个答案，只有一个正确选项的，多选不给分；有两个正确选项的，选对一个给2分，选错一个该小题不给分。共10小题，每小题4分，计40分。）
7．下列电池中不属于二次电池的是
（）A．碱性锌锰电池 B．铅蓄电池
C．镍镉电池 D．锂离子电池
8．有关原电池的工作原理中的下列说法中不正确的是
（）A．电池负极发生氧化反应
B．电池正极发生还原反应
C．电子流向是从负极流向正极（外电路）
D．电流方向是从负极流向正极（外电路）
9．原电池是将化学能转化为电能的装置，但其构成具有一定的条件，这些条件是（）。①电极（负极与正极：金属活动性不同）、②电解质溶液、③闭合回路、④灯泡 A．①②③④
B．①②③
C．①②④
D．②③④
10．锌电池可望代替铅蓄电池，它的构成材料是锌、空气、某种电解质溶液，发生的总反应是2 Zn＋O2＝2ZnO。下列有关它的说法正确的是
（） A．锌为电池负极，发生氧化反应
B．电解质溶液是酸性溶液
C．电池工作时，氧气与锌直接化合，生成氧化锌
D．负极发生的反应是：Zn－2ｅ＋H2O＝ZnO＋2H＋
11．日常所用干电池其电极分别为碳棒和锌皮，以糊状NH4Cl和ZnCl2作电解质（其中加入MnO2氧化吸收H2），电极反应可简化为：Zn－2ｅ＝Zn2＋；2NH4＋＋2e＝2 NH3＋H2（NH3再用于结合Zn2＋。）根据上述叙述判断下列说法中正确的是
（）A．干电池中Zn为正极，碳为负极
B．干电池工作时，电子由Zn极经外电路流向碳极
C．干电池长时间连续使用时内装糊状物可能流出腐蚀电器
D．干电池可以实现化学能向电能的转化和电能向化学能的转化
12．某同学做完铜、锌原电池的实验后得出了下列结论，你认为正确的是
（）A．构成原电池正极和负极的材料必须是两种金属 B．由铜、锌电极与硫酸铜溶液组成的原电池铜是负极
C．电子沿导线由锌流向铜，通过硫酸溶液被氢离子得到而放出氢气 D．铜锌原电池工作时，锌被硫酸溶解，所以才产生电子
13．燃料电池是一种新型电池，下列有关燃料电池的说法中正确的是
（）①优点之一是能量转换率高
②优点之二是无污染
③缺点之一是需要持续的补充燃料
④缺点之二技术问题有待改进，尚未广泛使用
A．①②③④ B．只有①② C．只有②③
D．只有②
14．下列反应中，在原理上可以设计成原电池的是
（）
A．Ba(OH)2•8H2O与NH4Cl的反应
B．铝片与盐酸的反应 C．甲烷与氧气的反应
D．石灰 石的分解反应
15．某学生用下图制作了原电池，其中正确的是
（）
16．现在各类碱性电池已经占有了越来越多的市场份额，这类电池广泛地应用于各种小型用
电器（如照相机、收音机等）中。有一种新型的锌锰电池就是这种碱性电池，它是在传统锌锰电池的基础上改进的。下列对于碱性锌锰电池的叙 述中正确的是
（）A．由于碱性物质的存在，这种电池的缺点是容易漏液失效 B．这种电池较传统锌锰电池使用寿命长
C．这种电池的电解质由传统的KOH改进为NH4Cl D．这种电池的电解质由传统的NH4Cl 改进为KOH 第Ⅱ卷（非选择题
共42分）
三、填空题（计 42分）
17．（9分）原电池是一种把
转化
的装置。在原电池中，较活泼的金属发生
反应，是
极，活泼性较差的金属发生
反应，是
极。
18．（18分）利用生活中或实验室中常用的物品，根据氧化还原反应知识和电学知识，自己动手设计一个原电池。请填写下列空白：
（1）实验原理：Fe＋2H＋＝Fe2＋＋H2↑。
（2）实验用品：电极（、）、稀硫酸、（填写所缺的实验用品）、耳机（或者电流计）（3）实验装置
（4）原电池设计及注意的问题
①按如图所示连接好实验仪器，注意观察（耳朵听）耳机是否有声音发出，如果没有，可将原电池的两个电极中的一极接触耳机插头上的一极（注意：接触的同时耳机的另一个极是连接在原电池的另一个电极上的），这时可以听见耳机发出“嚓嚓嚓„„„„”声音。其原因是：在原电池中，由化学能转化为，在耳机中又由
转化为声音这种能量。
②如果将装置中的耳机改为电流计，则铁钉应该接电流计的极，电极反应是：
，发生了
反应；铜钉应该接电流计的 极，电极反应是：，发生了
反应。19．（8分）题目：化学电池在通讯、交通及日常生活中有着广泛的应用。前常用的镍（Ni）镉（Cd）电池，其电池总反应可以表示为： Cd＋2NiO(OH)＋2H2O 2Ni(OH)2＋Cd(OH)2（1）已知Ni(OH)2 和Cd(OH)2均难溶于水但能溶于酸，放电就是使用电池的过程，充电 是给电池补充电量的过程。以下说法中正
确的是
① 以上反应不属于置换反应
② 以上反应是复分解反应
③ 充电时化学能转变为电能
④ 放电时化学能转变为电能 A．①③
B．②④
C．①④
D．②③
（2）废弃的镍镉电池已成为重要的环境污染物，有资料表明一节废镍锡电池可以使一平方米面积的耕地失去使用价值。在酸性土壤中这种污染尤为严重。这是因为
（3）另一种常用的电池是锂电池（它是一种碱金属元素，其相对原子质量为7，由于它的比容量（单位质量电板材料所能转换的电量）特别大而广泛应用于心脏起搏 器，一般使用的时间可长达十年。它的负极用金属锂制成；电池总反应可表示为：Li＋MnO2→LiMnO2试回答：锂电池比容量特别大的原因是
锂电池中的电解质溶液需用非水溶剂配制，为什么这种电池不能使用电解质的水溶液？请用化学方程式表示其原因
（4）下图是废弃镍钢电池中的重金属渗入水体后，进入人体的一条途径：
生物体D中重金属浓度
（大于、等于、小于）生物体A中重金属浓度，这是通过食物链
作用所引起的。除上述途径外，被污染水体中的重金属还可以直接通过
（途径）_________进入人体。
（5）下图是两个电池外壳上的说明文字某型号进口电池
某型号进口电池 某型号国产电池 RECHARGEABLE 1.2V 500mAh STANDARD
CHARGE 15h at 50mA GNY 0.6（KR－AA）1.2V 600mAh RECHARGE ABLESTANDARD CHARGE 15h at 60mA 上述进口电池的电动势是
伏。上述国产电池最多可放出
毫安时的电量；若该电池平均工作电流为0.03安，则最多可使用
小时。20．（7分）在由铜锌组成的原电池（电解质是稀硫酸）中，有位同学在铜电极收集到了56mL标准状况下的气体，试问：①铜电极产生56mL气体的过程中有多少摩尔的锌溶解？②铜电极产生56mL气体的过程中有多少摩尔的电子发生了转移？
第三篇：高中英语必修1,说课稿
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.第二课
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：人教新课标高中英语必修1 Unit 2教案(含六课时)
人教新课标高中英语必修1教案（含六课时）
Unit 2: English Around the World Ⅰ单元教学目标
技能目标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单元目标语言
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?
词汇
1.四会词汇
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.认读词汇
Shakespeare Noah Webster Lori dialect Houston Texas Butord Lest catfish 3.固定词组
Play a role(in), because of, come up, such as 语法
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.单元教材分析和教材重组 1.教材分析
本单元的中心话题是“English language and its development, different kinds of English”.通过对世界英语这一话题的探讨，加强学生对英语语言的了解，对当代语言特别是英语发展趋势的了解，世界在发展，时代在前进，语言作为交流的工具，也随着时代的发展而变化，由于英语在世界上的广泛应用，它不断吸收、交融、容纳、创新，这就形成了各种各样带有国家、民族、地区特色的英语。尽管如此，我们还是要通过本单元课文的学习让同学们感受、了解美国英语、澳大利亚英语、印度英语、新加坡英语等都有自己的规律和习惯用法和不同发音规则。
1.1 Warming up简要介绍了世界英语的分支以及英语语言在不同国家产生的差异，使学生感受英语语言的多文化、多层次、多元性，对英国英语和美国英语的不同有一个初步的了解。
1.2 Pre –reading通过两个问题引发学生对课文主题的思考，以便参与课堂活动。
1.3 Reading 简要地说明英语语言的起源、发展变化、形成原因，以及它的发展趋势。1.4 Comprehending 主要是检测学生对课文基本内容的理解程度。
1.5 Learning About the Language 主要通过各种练习帮助学生重温本单元前几个部分所学的新单词和短语，同时也通过新的例子展现了美国英语、英国英语的差异，并着重介绍了本单元的语法项目（Request &Command and Indirect Speech）
1.6 Using Language其中的reading and talking主要介绍了当今世界各地英语有自己的特色，即使是美国东西部、南北部、说话均有所不同。为了帮助培养跨文化意识，可以让学生学完课文后讨论中国的方言，使他们感受到本国的文化差异。2.教材重组
2.1 导入 把Warming Up作为一堂课。
2.2 精读 把Pre-reading, Reading和 Comprehending整合在一起作为一堂精读课
2.3 语言学习把Learning About the Language 和Workbook 中的Using Structures结合在一起。
2.4写作
2.5听和说 把课文中的听和说整合成一堂课。
2.6练习课 workbook exercise & other exercise 3.课型设计与课时分配
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、教学目标（teaching aims）1.能力目标（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.语言目标(language aim)More than;include;play an important role;because of;international;native;elevator;flat;apartment;rubber;petrol;gas
二、教学重难点（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、教学方法（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、教学步骤（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、作业
七、板书设计
八、反思
Unit2 English Around the World Period Two Reading
一、教学目标（teaching aims）
Get the students to know English language and its development and different kinds of English through this passage.教学内容（Teaching contents）
Get the knowledge of English language and its development and different kinds of English.能力目标（ability aim）
Get some knowledge of different kinds of English.语言目标(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、教学重难点（Teaching important points and difficult points）The indirect speech of the imperative clause.三、教学方法（Teaching Methods）Task-based approach
四、教具（Teaching aids）Multi-media computer
五、教学步骤（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、作业（Homework）
1.Finish the exercise on page 10.2.Read passage on page 51
七、板书设计
八、反思
Unit 2 English Around the World Period Three Learning about the Language
一、教学目标（teaching aims）1.能力目标（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.语言目标（Language aim）
Command;request;retell;polite;boss Indirect Speech(request & command)
二、教学重难点（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、教学方法（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、教学步骤（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、作业（Homework）
七、板书设计
八、反思
Unit 2 English Around the World Period Four Writing
一、教学目标（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 教学内容（Teaching contents）Write a statement 能力目标（Ability aim）
Use the brainstorming way to connect sentences and then arrange them properly.语言目标（Language aim）I think’ I believe’
In my opinion, We learn English to……
二、教学重难点（Teaching important and difficult points）How to arrange sentences correctly.Try to use connecting words.三、教学方法（Teaching methods）Brainstorming way
四、教具（teaching aids）Multi-media computer
五、教学步骤（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、作业（Homework）
七、板书设计
八、反思
Unit 2 English Around the World Period Five Listening & Speaking
一、教学目标（Teaching aims）
教材(Teaching materials)listening materials on P12 and P14 on the textbook, another one attached 能力目标（ability sim）
Enable students to catch the listening materials and understand them and distinguish American and British English, try to use them in dialogues.语言目标（Language aim）
Distinguish some words used in American and British English, and some dialect and accent.二、教学重难点（Teaching important and difficult points）
Understand words used in American and British English which have the meanings and some dialect accents.三、教学方法（Teaching methods）Listening and talking
四、教具（Teaching aids）
Tape recorder and get students answer sheet printed out
五、教学步骤（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、作业（Homework）
七、板书设计
八、反思
Unit 2 English Around the World Period Six Exercise
一、教学目标（Teaching aims）Finish the exercise on the workbook 1.能力目标（Ability aim）
a.Enable the students to command “commands and requests” b.Through cooperative work find out correct answer themselves.2.语言目标（Language aim）Full understanding of the readings.二、教学重难点（Teaching important and difficult point）Understand the main ideas of the passage.三、教学方法（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、教学步骤（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、作业（Homework）
七、板书设计
八、反思
第五篇：17_《牛顿第二定律》教案(新人教必修1)
牛顿第二定律
教学目标：
一、知识目标
1．理解加速度与力和质量的关系；
2．理解牛顿第二定律的内容，知道定律的确切含义；
3．知道得到牛顿第二定律的实验过程。
二、能力目标
培养学生的实验能力、分析能力和解决问题的能力。
三、德育目标
使学生知道物理中的一种研究问题的方法——控制变量法
教学重点
1．牛顿第二定律的实验过程；
2．牛顿第二定律。
教学难点
牛顿第二定律的意义。
教学方法
实验法、讲授法、归纳法
教学用具
两辆质量相同的小车，光滑的水平板（一端带有定滑轮）；砝码（一盒），细绳、夹子 课时安排 2课时
教学过程
一、导入新课
1．提问：什么是物体运动状态的改变？物体运动状态发生改变的原因是什么？
2．引入新课：
通过上节课的学习，我们已知道：物体运动状态改变时产生加速度，而产生的加速度又和物体的质量及所受力的大小有关，那么：加速度跟物体所受力的大小及物体质量之间有什么关系呢？本节课我们就来研究这个问题。
二、新课教学
（一）用投影片出示本节课的学习目标：
1．理解加速度与力的关系；
2．理解加速度与质量的关系
3．理解牛顿第二定律的内容。
（二）学习目标完成过程：
1、加速度和力的关系：
（1）用投影片出示本节课所用的实验装置，教师进行讲解：图中是两辆质量相同的小车，放在光滑的水平板上，小车的前端各系上细绳，绳的另一端跨过定滑轮各挂一个小盘，盘里放有数量不等的砝码，使两辆小车在不同的拉力下做匀加速运动。
（2）对本次实验中说明的两个问题
a：砝码跟小车相比质量较小，细绳对小车的拉力近似地等于砝码所受的重力。
b：用一只夹子夹住两根细绳，以同时控控制两辆小车。
（3）实验的做法：
a：在两砝码盘中放不同数量的砝码，以使两小车所受的拉力不同。
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b：打开夹子，让两辆小车同时从静止开始运动，一段时间后关上夹子，让它们同时停下来。
（4）需观察的现象，观察两辆车在相等的时间里，所发生的位移的大小。（实验现象：所受拉力大的那辆小车，位移大）
（5）分析推理：
a：由公式s1at2得到在时间t一定时，位移s和加速度a成正比；
2b：由实验现象得到：小车的位移与他们所受的拉力成正比。
c：推理得到结论：对质量相同的物体，物体的加速度跟作用在物体上的力成正比，即：
a1F1或aF a2F2a1F1a2F2
（6）巩固练习：
a．据得到：要使物体在短时间内速度的改变很大，即加速度很大，就必须给物体提供。
b．竞赛用的小汽车，要求起动后几秒钟内速度由零达到60m/s以上，他们为什么要装备功率很大的发动机？
2：加速度和质量的关系：
（1）实验装置同上；
（2）说明与前次实验的不同。
前一次实验中，我们是保持小车质量不变，而改变小车所受力的大小，来研究加速度和力之间的关系的。
本次实验是使两辆小车所受拉力相同，而在一辆小车上加放砝码的，以增大质量，研究加速度和质量之间关系的。
（3）实验现象：
在相同的时间里，质量小的那辆小车的位移大。
（4）分析推理，得到结论：
在相同的力作用下，物体的加速度跟物体的质量成反比，即
a1/a2=m2/m1或a∝m3：牛顿第二运动定律
（1）综合上述实验中得到的两个关系，得到下述结论：
物体的加速度跟作用力成正比，跟物体的质量成反比，且加速度的方向跟引起这个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：如果每个物理量都采用国际单位，k＝1；
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b：力的单位（牛顿）的定义：使质量为1千克的物体产生1m/s2的加速度的力叫做1牛顿。
（3）推广：上面我们研究的是物体受到一个力作用的情况，当物体受到几个力作用时，上述关系可推广为：
物体的加速度跟所受的合力成正比，跟物体的质量成反比，加速度的放心跟合力的方向相同。即F合＝ma。
（4）介绍F合和a的瞬时对应关系
a：只有物体受到力的作用，物体才具有加速度。
b：力恒定不变，加速度也恒定不变。
c：力随着时间改变，加速度也随着时间改变。
d：力停止作用，加速度也随即消失。
4：例题分析（课本例题）
（1）学生阅读例题内容
（2）分析：
质量m已知必须先求F1和F2的合力，而合力的大小可
要求物体的加速度以用作图法求解，也可以用计算法求解。
（3）用投影片展示解题过程：
如图所示，建立平面直角坐标系，把力F1和F2分别沿x轴和y轴的方向分解F1的两个分力为：
F1xF1xcos60o,F2yF2sin60o
F2的两个分力为：F2xoF2cos60o,F2yF2sin60
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F1xF2xF1cos60oF2cos60o5N5N10N
已知合力F合和质量m，据F合＝ma，即可求得：
10NaF合5m/s2
2kg
三：小结
1：本节课的研究方法——控制变量法
2：牛顿第二运动定律确定了a和F之间的大小关系，也确定的a和F的方向关系
3：求解合力时，可采用建立平面直角坐标系，将各个力沿x轴和y轴分解，最后求合力的方法。
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四、作业
课本P53练习二
五、板书设计：
定律的实验条件（控制变量法）
1、m一定时，aF1
2、F一定时，am
3、把Fma改写成，在F,m,a取国际单位的条件下k1牛顿第二定律内容：物体运动的加速度与合外力成正比，与质量成反比，且加速度与合外力方向相同F合和a的方向关系1N1kgm/s2单位关系：物理意义：瞬时对应关系因果对应关系
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