第3节重力
【学习目标】
1．空中物体为什么会下落？什么叫做重力？
2．重力的大小与质量有什么关系？（学习重点，要求熟记、会计算）
3．重力的方向是怎样的？
4．物体受到重力的作用点在哪儿？
【课前预习学案】
一、认真阅读课本第9页第3节《重力》，完成下列问题：
1．力是。力的、和都会影响力的作用效果，因此这三者又叫做力的三要素。
2．向空中抛出的橡皮，为什么最终会落向地面？
3．下列物体中，不受到
．．．重力的有（）
A．地上的石块 B．空中的飞鸟C．水中的鱼儿D．天上的星星
4．物体所受的重力有大小吗？请举例说明。怎样测量出你的文具袋的重力大小（提示：需要说出测量工具和简单过程）？
二、学生展示+教师点拨
【课内活动学案】
任务一：物体下落的原因是什么?
发现：
1.重力：由于地球的吸引而使物体受到的力，
①②重力是物体力
知识准备：展示（或复述）用什么工具怎样测量出笔袋的重力大小？数据记录G笔袋＝。
任务二：重力的大小跟什么因素有关系？
猜想：重力的大小可能跟有关
探究重力的大小跟质量有什么样的关系？
设计实验：说说你将怎样做实验？（教师可提示所用工具、器材）
进行实验：
记录实验数据：
质量m /kg
重力G /N
作图：以质量为横坐标、重力为纵坐标描点并连接这些点。
观察思考：物体所受重力跟它的质量之间有什么关系？
发现：
例题：一个质量为72kg的宇航员在地球上重多少牛？如果他达到月球表面，他的质量是多少千克？已知
物体在月球上的重力大约是它在地球上重力的1
6
，则该宇航员在月球上的重力为多少牛？（g取10N
／kg）
解：宇航员在地球上受到的重力
＝72kg×N／kg＝720N
因为质量不随位置变化，宇航员达到月球表面，他的质量仍然为72kg
宇航员
练习：
1．体检时测出小明的质量为50kg，则小明受到的重力是多少？（g取10N／kg）
2．某独木桥一次最多能让重4900 N的物体通过，则这个物体的质量是多少千克？合多少吨？（g取10N ／kg）
任务三：重力的方向是怎样的？
1．观察教师所做“铅垂线”的演示实验，思考其中细线指示的方向有什么特点？
记录：重力的方向总是。
2．活动：完成下面两个活动后，讨论竖直向下和垂直向下有什么区别？
第一步：在下图中，利用三角板
．．．．．画出经过A点到山坡面的垂线段，在垂线段上标出箭头表示出垂直山坡向下的方向。
第二步：用细线悬挂着橡皮做成“铅垂线”（用两个手指轻轻夹住直尺的一端、直尺自由下垂也可当作“铅垂线”），把下图立起来，用自制的“铅垂线”来确定通过A点的竖直向下方向。
发现：
①在任何地方，竖直向下总是与水平线是垂直的（如果没有水平线，可以假想一个水平线直。
说明：基础较好的班级，可进一步组织学生“想想议议”，讨论得出“下”归根到底是指向地球的中心。
任务四：重力的作用点在哪里？
情境创设：
如图一根重3N的玉米棒上有300多颗玉米粒，每颗玉米粒都受到重力吗？在画玉米棒受到的重力时，有必要画出每颗玉米粒受到的重力吗？这根玉米棒受到的重力的作用点在哪里？能否在这根玉米棒上找一个特殊的点来代表所有的玉米粒和玉米芯？
发现：
练习：
下列质地均匀、外形规则物体的重心在哪里？请在下列物体的重心处画一个“·”表示它们重心所处的位置。
甲、长方体橡皮乙、玻璃珠丙、直铁丝
【本节内容的完善或小结：】
【练习巩固学案】
1．叫做重力，通常用字母表示。重力也是一种力，因此重力的单位是，单位符号是。
2．下面关于重力的说法中错误
．．的是（）
A．地面附近的所有物体都受重力的作用B．物体受重力不一定与地面接触
C．重力没有施力物体 D．地球对月球的吸引力不能叫做重力
3．质量为30吨的坦克，重多少牛？（g取10N/kg）
4．铁块重2.45N，能否用最大称量是200g的托盘天平称这块铁块的质量？（g取10N/kg）
5．学习了重力这一节后，小明说“g＝9.8N/kg的意思就是1kg=9.8N”。
（1）小明说得对吗？为什么？
（2）一串香蕉的质量为1kg，请计算它受到的重力。
6．作图：
（1）如图一只篮球重6N，用力的示意图法画出篮球受的到的重力。
（2）如图木块放在斜面上静止不动，画出木块重力的示意图。
（3）如图一只铅球正从斜面上往下滚，画出此时铅球重力的示意图。
（1）题图（2）题图（3）题图
（4）如图所示小球从斜面顶端沿虚线滚下，请你分别画出小球在1、2、3、A四个位置时所受重力的示意图。
2012考研初试成绩已经公布，接下来就是复试，其中的英语口语可以说是让很多英语不是很好的学生发怵， 针对这种情况，武理同起点考研在校研究生团队结合往年的辅导经验，总结了一下考研英语口语复试中常见的 问题及应对策略，希望能给正在准备复试的同学有所帮助。 首先必有的一个环节就是自我介绍，考生可以提前背一些自认为最容易把握的模板，并把自己的特色加在 8 里面，这将会为你在老师心中的印象加分不少。其实，把一种模板掌握得很熟练，足矣。 在自我介绍完了，老师就会开始问你问题这里列出一些常见的问题，可以认真准备。注意在准备的过程中， 要结合自己的经历和见解来准备答案，让自己回答的问题和整个的自我介绍融为一个整体。 在每一年的面试中都会有很多相同的问题，这些问题看起来很平常，却有很多陷阱。回答这些常见的看起 来很平常的问题，是很有艺术的。 传统面试问题（Sample Traditional Interview Questions） 1、"What can you tell me about yourself?" （"关于你自己，你能告诉我些什么？"） This is not an invitation to give your life history. The interviewer is looking for clues about your character, qualifications, ambitions, and motivations. 这一问题如果面试没有安排自我介绍的时间的话。这是一个必问的问题。考官并不希望你大谈你的个人历 史。是在寻找有关你性格、资历、志向和生活动力的线索。来判断你是否适合读MBA。 The following is a good example of a positive response. "In high school I was involved in competitive sports and I always tried to improve in each sport I participated in. As a college student, I worked in a clothing store part-time and found that I could sell things easily. The sale was important, but for me, it was even more important to make sure that the customer was satisfied. It was not long before customers came back to the store and specifically asked for me to help them. I'm very competitive and it means a lot to me to be the best." 下面是一个积极正面回答的好例子："在高中我参加各种竞争性体育活动，并一直努力提高各项运动的成绩。 大学期间，我曾在一家服装店打工，我发现我能轻而易举地将东西推销出去。销售固然重要，但对我来说，更 重要的是要确信顾客能够满意。不久便有顾客返回那家服装店点名让我为他们服务。我很有竞争意识，力求完 美对我很重要。" 2、"What would you like to be doing five years after graduation?"（"在毕业以后5年内你想做些
成都双语实验学校物理欧姆定律章末练习卷（Word版含解析） 一、初三物理欧姆定律易错压轴题（难） 1．有一只阻值未知的定值电阻R x。图甲是用伏安法测R x阻值的实物电路，电源电压恒为3V，滑动变阻器最大阻值为10Ω： U/V I/A R/Ω 10.80.2 2 1.60.4 3 2.00.5 (1)甲图中有一根导线连接错误，请在该导线上画“×”并在图上改正（所画的导线用实线且不能交叉）； （_____________） (2)改正电路后，闭合开关，发现无论怎样移动滑动变阻器滑片，两电表均无示数，其原因可能是______（填字母）； A．滑动变阻器断路 B．R x断路 C．R x短路 (3)故障排除后，正确操作实验器材，移动滑片，当电压表示数为1.2V时，电流表示数如图乙所示，则待测电阻R x=____________Ω； (4)实验小组测了三组数据（如上表），进行多次实验的目的是____________；分析表中数据可知，不可能通过以上实验获得的数据是____________（填序号）。原因是 ________________； [拓展]小明认为，实际中电流表和电压表都有内阻，若考虑电表的内阻，利用甲图改正后的电路测量电阻时，如果电压表和电流表的读数分别为U和I，而它们自身电阻分别为R v 和R A，则R x更准确的表达式为__________。
【答案】 A 4 取平均值减小误差 1 电压表示数为0.8V 时，滑动变阻器连入的电阻大于滑动变阻器的最大阻值 V V -UR IR U 【解析】 【分析】 【详解】 (1)[1]用伏安法测R x 阻值的大小，需要知道R x 两端的电压大小，流过R x 的电流大小；从图甲可以看到，可以把电阻R x 左端与电流表的接线改成电阻R x 左端与开关S 右端相连，这时电流从电源正极流出，流过电流表、滑动变阻器、电阻R x ，再流过开关S ，最后回负极，电压表并联在电阻R x 的两端；根据上述修改实物图，如下图所示。 (2)[2]A ．假设滑动变阻器断路，那么整个电路都没有电流，电流表没有示数，电压表也没有示数，这与题中的条件相符合，所以可能是滑动变阻器断路，选项A 符合题意； B ．假设R x 断路，那么电路中没有电流，电流表没有示数，电压表测的是电源电压，有示数，这与题中的条件不符合，所以不可能是R x 断路，B 项不合题意； C ．假设R x 短路，那么电路中有电流流过，电流表会有示数，电压表没有示数，这与题中的条件不符合，所以不可能是R x 短路，C 项不合题意。 故选A 。 (3)[3]从图乙可以看到，电流表的量程是0~0.6A ，分度值是0.02A ，它的读数是0.3A ，根据U R I 可知，待测电阻R x 的大小是
看看全国排名前260名的重点中学都有哪些? 对于重点中学的排名向来版本多样，主要是依据的标准不一样。综合升学率、师资力量、硬件设备等标准，看看全国排名前260名的中学都有哪些？北京又有哪些中学入围了？ 入围全国重点中学行列——北京 北京四中 人大附中 北师大实验中学 北大附中 清华附中 101中学 北师大二附中 八十中 景山学校 汇文中学10 甘肃 兰州一中 西北师大附中 甘肃兰州新亚中学 兰州铁路局第五中学 西峰三中 湖南 师大附中 长沙一中 雅礼中学 岳阳一中
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Unit 7 Teenagers should be allowed to choose their own clothes Date： Name： 【Learning Aims 学习目标】 1.自学本课时的新单词和短语，并听，读，背。 2.完成Section A 听力1b, 2a, 2b。 3.阅读2d并完成相应问题。 4.自学知识点完成预习反馈。 预习导学 Task 1 New words 预习指导反思 1. license 2. safety 3. smoke 4. part-time 5.pierce 6.earring 7.flash 根据音标或MP3掌握新单词的读音，注意其词性词义。 Task 2 Phrases 预习指导反思 1.be allowed to do sth 被允许做什么 2.sixteen-year-olds 16岁的青少年 3.have par t-time jobs 做兼职工作 4.get one’s driver’s license 获得驾照 5.No way 不行，不可以 6.get ears pierced 穿耳洞 7.cut one’s hair 剪头发 8.stop doing sth 停止做什么 9.spend time with friends 花时间陪朋友 10.be excited about 对-----感到兴奋 11.take photos 拍照 12.make sure 确保在书中画出短语并标注汉语。 Task 3 Sentences 预习指导反思Things Rules Structures smoke should not Sixte en-year-olds should not be allowed to smoke. take photos in the museum may be We may be allowed to take some photos in the museum. have a part-time job get the ears pierced 认真阅读课本P49-50，以青少年应该被允许做什么或不被允许做什么为话题,试着完成表格，可以尝试自己想几个例子补充在表格内。
1, Do you know any secrets of longevity? What is your desirable life expectancy? Do you think people are happier as the life expectancy soars? 2, When you were a child, did you dream of going to Disneyland? What activities would you be interested in? How a Disneyland attract children? Talk about the advantages or disadvantages of a new Disneyland located in Shanghai. 3, The dictionary is usually considered only as a tool for consultation and not for vocabulary learning. However, some learners choose to memorizes and regard this as an effective strategy. What do you think of this way of learning? What role does the dictionary play in your language learning? 4, What so you think of face transplant, possible or absurd? If you can choose, which do you prefer in a face transplant: the donor or the recipient? Whose face would you like to have if it is possible? 5, People are suffering psychological damage because of society’s obsession with “permayouth”, which refers to the appearance of youthfulness maintained over time by men and women into cosmetic surgery clinics to maintain their looks. Do you think cosmetic surgery should be encouraged to maintain youthfulness? Give reasons to support your ideas. 6, What are the main difference of natural disasters and man-made disasters? What lessons have we learned from it? What can we do to help people in a disaster-stricken area? Give examples to illustrate. 7, Fashions come and go. Use specific examples to illustrate this idea. Are you a fashion victim of a slave to fashion? How do you think “Fashion is the art full of vigour and never out of date”? Do you think fashion is eternal or instantly changing? What is the point of following fashion? 8, April 23 is regard as the World’s Reading Day. Do you like reading? There is an old Chinese saying that travelling a thousand miles outdoes reading a thousand books. Do you agree? It seems that modern people are indulged in various types of electronic fun and no longer able to engage in reading. What is your opinion. 9, To protect our planet and improve our quality of life, low-carbon life has become increasingly important. What do you know about low-carbon life? How can we live a low-carbon life? 10, What are the important factors for staying healthy? Who do you think is responsible for the care of your healthy—you by yourself, your parents, or your doctor and medical people? What do you usually do to keep healthy?
《雪花的快乐》 一、教学目标： 1.通过诵读、研读、讨论等形式来培养学生理解诗歌意境，体会诗人的思想感情的能力。 2.体味诗歌语言的形象、含蓄和优美。 3.培养乐观、积极地追求理想的情操。 二、学习环节 【导】 1、图片、视频导入。 2、作者简介。 徐志摩现代诗人、散文家。浙江海宁县人。新月派代表诗人。有代表作《雪花的快乐》、《再别康桥》。康桥即是英国的剑桥大学，徐志摩曾在那留学，离别时写下这首著名诗歌。一生中最重要的三个女性：张幼仪、林徽因、陆小曼。1931年11月19日，徐志摩搭乘飞机飞向北平，飞机在山东党家山上空撞山炸毁，想飞的诗人死于飞。 徐志摩的诗字句清新，韵律谐和，比喻新奇，想象丰富，意境优美，神思飘逸，富于变化，并追求艺术形式的整齐、华美，具有鲜明的艺术个性，是新月派的代表诗人。 【读】 1、自由朗读诗歌，感知诗歌的大意。 2、小组内互读，读出味道，读出感情。 3、班级展示，派代表在全班面前读出你们的水平。 【赏】 （一）独学 1、诗歌的题目为“雪花的快乐”，请结合诗句找一找，雪花的快乐表现在哪些地方？ “翩翩”——表现出雪花欣喜自得、潇洒的气度超脱； “飞扬”——表现出雪花精神兴奋； “娟娟的”——体现出雪花姿态柔美飘动； “身轻的”——表现出雪花很灵活，心情很轻松。 2、雪花为什么那么快乐？ （1）从诗句的描写，我们可以看出雪花是自由的。 （2）雪花有他自己的追求和方向，并且对自己的追求是坚定的。 （二）群学 3、诗中的“她”有哪些特点？请结合诗句进行分析，并猜一猜“她”是谁？ 住在清幽之地——性情安静 出入雪中花园——性情高贵纯洁，爱美 浑身散发朱砂梅的清香——有着梅花一样的品质 有柔波似的心胸——性情温柔，心胸广阔 “她”可能是诗人的恋人，
武汉大学 2017年攻读博士学位研究生外语综合水平考试试题 （满分值100分） 科目名称：英语科目代码：1101 注意：所有的答题内容必须写在答案纸上，凡写在试题或草稿纸上的一律无效。 Part I Reading Comprehension (2’×20 = 40 points) Directions:In this part of the test, there will be 5 passages for you to read. Each passage is followed by 4 questions or unfinished statements, and each question or unfinished statement is followed by four choices marked A, B, C and D. You are to decide on the best choice by blackening the corresponding letter on the ANSWER SHEET. Passage One Mr Gordon is right that the second industrial revolution involved never-to-be-repeated changes. But that does not mean that driverless cars count for nothing. Messrs Erixon and Weigel are also right to worry about the West’s dismal recent record in producing new companies. But many old firms are not run by bureaucrats and have reinvented themselves many times over: General Electric must be on at least its ninth life. And the impact of giant new firms born in the past 20 years such as Uber, Google and Facebook should not be underestimated: they have all the Schumpeterian characteristics the authors admire. On the pessimists’ side the strongest argument relies not on closely watching corporate and investor behavior but rather on macro-level statistics on productivity. The figures from recent years are truly dismal. Karim Foda, of the Brookings Institution, calculates that labor productivity in the rich world is growing at its slowest rate since 1950. Total factor productivity (which tries to measure innovation) has grown at just 0.1% in advanced economies since 2004, well below its historical average. Optimists have two retorts. The first is that there must be something wrong with the figures. One possibility is that they fail to count the huge consumer surplus given away free of charge on the internet. But this is unconvincing. The official figures may well be understating the impact of the internet revolution, just as they downplayed the impact of electricity and cars in the past, but they are not understating it enough to explain the recent decline in productivity growth. Another, second line of argument that the productivity revolution has only just begun is more persuasive. Over the past decade many IT companies may have focused on things that were more “fun than fundamental” in Paul Krugman’s phrase.But Silicon Valley’s best companies are certainly focusing on things that change the material world.
成都双语实验学校中考英语阅读理解训练中考英语专项训练含答案解析 一、中考英语阅读理解训练 1．阅读理解 Everyone has eaten instant noodles（方便面）. It is very easy to cook it instantly by putting the noodles into the boiling water and adding in ingredient packets, together with other food like eggs or vegetables. However, have you ever wondered whether this is the correct way of cooking it? When you first take out the noodles from the packaging, you will notice that the noodles are joined together nicely as a piece. In order to make the noodles joined together nicely side by side, it needs some form of wax coating（石蜡涂层） to achieve an attractive instant noodles in front of us. However, researches have shown that the layer of wax coating on the noodles is quite harmful to our body and we should not eat it too often. It is advisable to have a break of 2-3 days before we start to eat another packet of instant noodles as our body need about 3 days to clear that layer of wax coating away from our body system. Do you know the danger of having too much wax coating stored in our stomach? It will lead to CANCER. There are two key points to take note while preparing instant noodles: （1） Wash the instant noodles with warm water first, stir it and pour away the water containing the wax coating. （2）Repeat Step 1 and try to stir the noodles again to wash away the wax coating on the noodles before cooking it in a new pot of water. Hope this article will help you when you choose to eat instant noodles. （1）The function of the wax coating in the instant noodles is to_______. A. make the noodles more delicious and tasty B. make it easier to cook for the consumers C. make the instant noodles healthier and more attractive to the consumers D. make the noodles joined in a piece and avoid them sticking together （2）What does Paragraph 3 mainly talk about? A. The hidden dangers of the instant noodles. B. The way of how our body clears the wax coating. C. How to cook instant noodles. D. Researches on advantages of the wax coating. （3）What does the underlined word "contain" mean? A. 去除 B. 包含 C. 储存 D. 需要（4）What is the purpose of the writer to write the passage? A. To tell us the dangers of instant noodles. B. To tell us how to cook instant noodles. C. To tell us something about the layer of wax coating on the noodles. D. To tell us how to eat instant noodles safely and healthily. 【答案】（1）D （2）A
2020年中考英语模拟试卷 第Ⅰ卷（选择题，共85分） 一、听力测试（共三节） 第一节（共4小题, 每小题1分，满分4分) 听下面4个问题，每个问题后有三个答语，从题中所给的A、B、C三个选项中选出最佳选项。听完每个问题后，你都有5秒钟的时间来作答和阅读下一小题。每个问题仅读一遍。 1. A. Very cool. B. It’s smart. C. A black cat. 2. A. The bigger one. B. It’s bitter. C. Too long. 3. A. It’s Jim. B. Jack’s. C. A nice one. 4. A. In a week. B. About one week. C. Twice a week. 第二节（共8题, 每小题1分，满分8分） 听下面8段对话，每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后，你都有10秒钟的时间来作答和阅读下一小题。每段对话仅读一遍。 5. How is the man? A. Not good. B. Tired. C. OK. 6. What can we know about Kate’s sister? A. She doesn’t talk much. B. She’s noisy. C. She isn’t friendly. 7. What is the girl’s aunt? A. A nurse. B. A patient. C. A doctor. 8. What are they ta lking about? A. Food. B. Chocolate. C. Inventions. 9. Who is wanted on the phone? A. Bob Thomas. B. Mr. Green. C. Mrs. Smith. 10. What do you know about the boy? A. He likes math. B. He likes to take exams. C. He is not good at English. 11. What does the boy have to do? A. Write a report. B. Study on the Internet. C. Search famous people. 12. What does the woman mean?
Music Do you think music makes you smarter and healthier? I think music can make us smarter and healthier. Studies show that music has a strong effect on our mood levels and emotions, and also on how we think and our general intelligence.Music can make people calmer and more relaxed. The music we listen to can have a profound effect on our test scores and our ability to quickly process information.And it can help students to integrate both sides of the brain for more efficient learning and reduce errors.If we’ve ever played an instrument, studies show that we’re already ahead of the curve. Playing an instrument is a great way to test out our creative thinking and push our brain to process information in a new way. I think music can make us smarter and healthier. Music plays a significant role in our life, it can make you relaxed, give you inspiration, and make your life colorful. Studies show that music has a strong effect on our mood level and emotions, and also on how we think and our general intelligence. The music we listen to can have a profound effect on our test scores and our ability to quickly process information. Music can help me concentrate. When I am feeling anxious or stressed , a piece of good music can bring me a pleasant feeling and good mood, I will be better to equipped to concentrate and focus my attention on a fairly lengthy task. Music can be a great pick-me-up for when you are stressed. Tuning in to one of your favourite songs can be incredibly soothing and help to reduce anxiety. Music can help increase endurance , listening to certain music could actually help you run faster. The best choices for exercise are up-beat songs that match the tempo of your running stride and which can have a metronomic effect on the body, enabling you to run for longer. Music can actually have a significant positive impact on patients with long-term illnesses, such as heart disease, cancer and respiratory conditions.Numerous trials have shown that music can help lower heart rate, blood pressure and help relieve pain, anxiety and improve patient quality of life. If you’ve ever played an instrument, studies show that you’re already ahead of the curve. Playing an instrument is a great way to test out your creative thinking and push your brain to process information in a new way. Some other activities that make people smarter and healthier. I think regular exercise can make people healthier, smarter and happier. Working out regularly may make us stronger and reduce the risk of illness. It can also lessen the possibility that you’ll lose brain function as you age. And exercise can help us to deal with stress in our studies, relationships or any area of life, because exercise is a form of stress itself and helps condition our body to deal with it. Even a little exercise can also make us calmer and more relaxed. And our brain is able work faster and more efficiently after exercise.
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武汉大学博士英语结课 考试 https://www.doczj.com/doc/406658817.html,work Information Technology Company.2020YEAR
Para 3 Unit1 Our second major discovery was that the information marketplace will dramatically affect people Para 12 Unit 1 once they are integrated, they present a much greater power-the power to prevent an asthmatic Para 1, unit 8 Countless cultures around the world have disappeared along with their mythologies. In Mesoamerica, dozens of ornate Mayan temples lie mute, as do an untold number of Incan Para 4 Unit 8 It is likely that changes in the forest occurred over decades and would have been difficult to detect
Para 6, unit 8 Humanity may not act in time to prevent the decimation of the rain forests, fossil fuels, arable Para 8, unit 8 If we are going to avoid the fate of the Easter islanders, we must change the myths that are …… Para 12, unit 8 But as the Grand Narrative of Process came to dominate other values and views, it cast a …… Para 25, unit 8 已做课堂练习 With recognition of the limitations of linguistic exchange, postmodernists urge that “press beyond dialogue.” For example, athletes and musicians from all walks of life can generate smooth and