2022年人教版物理《功》教学设计黄红霞 .pdf

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1、初中西片联片教研活动材料：义务教育课程标准实验教科书九年级物理第十五章第一节功教学设计华宁公司子弟学校黄红霞一、教学目标1、知识与技能：知道做功的两个必要因素。理解功的定义、计算公式和单位，并会用功的公式进行简单计算。知道功的原理。2、过程与方法：通过观察和思考，判断在什么情况下力对物体做了功，在什么情况下没有做功通过推理、分析与阅读，得出功与力、在力的方向上移动距离的定性关系。通过课前的预习，培养学生自主学习和阅读能力，经历探究功的原理的过程，感知使用机械不能省功的事实。3、情感、态度与价值观：通过联系生活、生产实际激发求知欲,培养探索自然现象和日常生活中的物理学道理的兴趣。用物理学史培养学

2、生的科学态度和科学精神。通过合作性的探究，展示性交流，增强自信，树立自尊、学会合作的意识，追求学生和谐发展。二、教学重点、难点：1、理解功的概念及计算。2、判断力对物体是否做功，以及对“功的原理”的探究与理解。三、教学方法：以“课前预习、课堂展示”为主的综合探究式。四、教学前准备1、功预习提示（每位学生一份，课前一天发给学生）2、教具：细绳、弹簧测力计、杠杆和支架、钩码、滑轮、细线、刻度尺等。五、教学过程：一、问题引入：让学生说一说，含有“功”的成语或词语，指出其中“功”的含义针对学生的回答，教师点评：现代汉语中的“功”主要有成效、成功、贡献的意思，物理力学中的“功”吸收了其中“成效”的意思，

3、但它又有特殊的含义，这节课我们一起研究力学的“功”六、新课教学（按照“预习提示”的要求，学生展示、交流他们的预习成果，教师适时点拨总结）问题 1：说出力学中的“功”的具体确切含义是什么？学生回答后，教师总结、板书：文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5

4、A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10

5、ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K

6、2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文

7、档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD

8、10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4

9、S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 H

10、A3X8F5A1K10 ZC7I7K2N2H1“功”的含义：力方向距离力做功问题 2：仔细观察课本 P104 页各图，学生回答：图 15.11 几个做功的实例，它们有什么共同点？图 15.12 几个没有做功的实例，为什么没有做功？学生展示性分析问题、，教师引导；学生总结问题：做功必须满足的条件？板书：做功的条件：一是作用在物体上的力，二是物体在这个力的方向上移动的距离。问题 3：举例说明在你的周围，发现有哪些做功的例子？有哪些不做功的例子？根据学生的举例情况，教师点拨，也可以出示下面几个图片，让学生分析是否有做功的情况存在。图片（1）举重运动员把杠铃举高过程中是否对杠铃功？图片（2）运动员举着

11、杠铃在高处停留5 秒钟是否做功？图片（3）起重机吊着重物从A 点沿竖直方向提升到B 点，然后沿水平方向把物体移动到C 点，是否有做功的情况存在。问题 4：力学中的“功”的大小可能与哪些因素有关？力学中的“功”的公式是“功”的单位是学生回答以上问题后，教师板书：功的公式：W=FS单位：1J=1N m 出示焦耳的照片，教师介绍小资料：焦耳事迹和成就。文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1

12、文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:C

13、D10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H

14、4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7

15、HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F

16、5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10

17、 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7

18、K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1问题 5：105 页例题：设疑：这个例题你们有没有什么疑问？根据学生的回答，教师强调并板书：在使用公式求功之前，要明确哪个力做功？要搞清力的大小：对于本题来说，要写出拉力等于摩擦力等于多少？要注意单位的统一问题 6、联系我们学过的简单机械的作用，设疑：使用简单机械能省功吗？师生讨论：如何探究使用杠杆和动滑轮提升物体能否省功的两个实验。设疑提问：为了探究使用机械是否省功，就是要比较什么？那么本实验需要测量哪些物理量呢？

19、需要计算哪些量？根据学生回答，对照小黑板介绍，实验需要测量的四个物理量、需要计算的两个量。分别请两个实验小组的同学上台，展示他们使用动滑轮提升物体以及使用杠杆提升物体时，是否能省功的实验过程和方法，并将所测的数据记入小黑板的表格中。师生评价实验过程与方法，教师点拨，师生共同讨论、分析实验数据，得出结论。板书：使用机械所做的功，都不会少于不用机械时所做的功，也就是使用任何机械都不省功，这个结论叫做功的原理。有人称之为“机械的黄金定律”文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2

20、H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码

21、:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P

22、2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T

23、7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X

24、8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K

25、10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7

26、I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1延申讨论：为什么“使用机械所做的功”总是“稍大于不用机械所做的功”呢？启发介绍：原来，机械的“动力”做功时，肯定要克服机械自重和机械内部的摩擦做功，如果忽略了机械自重（包括摩擦），我想，使用机械所做的功应该等于“不用机械时所做的功”即 W=W问题 8、学生作业展示抽取 P107“动手动脑学物理”的练习题4、5，让学生展示他们的解题

27、思路。师生评价、教师点拨。小结：1、你学到了什么？（学生小结）2、哪些疑惑得到解答？有哪些方面的进步？3、还想知道什么？准备怎么行动？4、还有哪些疑问？是否需要和教师沟通?课后作业：1、完成基础训练 15.1功的单元练习题文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3

28、X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1

29、K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC

30、7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N

31、2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编

32、码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10

33、P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1文档编码:CD10P2H4S3T7 HA3X8F5A1K10 ZC7I7K2N2H1