（粤教沪科版）八年级物理下册 【教案一】6.6探究滑轮的作用教案.doc

6.6 探究滑轮的作用

教学目标：

1．知识与技能目标：

①知道定滑轮、动滑轮的作用，能区分定滑轮与动滑轮。

②会组装简单实验装置。

③会用杠杆平衡条件分析定滑轮和动滑轮的特点。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

2.过程和方法

①通过观察，了解滑轮的构造，培养学生观察能力。

②通过探究活动，培养学生研究物理的正确方法。

③通过实验现象和数据的分析，培养学生归纳总结、逻辑推理能力。

3．情感、态度和价值观目标：

①通过“升旗”情景，对学生进行爱国主义的教育。

②通过探究活动，激发学生主动获取知识的兴趣和欲望，培养学生乐于探索并善于探索的学习品质。

③通过小组间交流与合作，培养学生团结合作的精神；在定、动滑轮学习的过程中，培养学生发现问题、提出问题、用已知的知识解决问题的能力,

教学重点和难点

1．  重点：定滑轮、动滑轮的特点和工作原理。

2．  难点：动滑轮的支点和它的工作原理。

教学过程：

一、课题引入：升旗引入滑轮  提问：生活中还有哪些地方使用过滑轮？引导学生有目的的观赏、有目的的思考、回答从而引入本课，板书课题：探究滑轮的作用。

二、教学新课：

  [引入]：从具体的事例中引出滑轮的分类：定滑轮和动滑轮

[演示]：用定滑轮提升钩码，让学生观察定滑轮在使用过程中有些什么特点？然后演示动滑轮提升钩码，让学生观察动滑轮在使用过程中有些什么特点？引导学生总结定滑轮的概念。

教师板书：滑轮的轴心位置不移动的滑轮叫定滑轮。滑轮的轴心位置随提升的物体一起移动的滑轮叫动滑轮。

  [演示]：用弹簧测力计测定滑轮提升钩码时的拉力，抽学生到讲台前读出拉力的大小，改变拉力的方向让学生读出拉力的大小，引导学生总结使用定滑轮的的好处。

教师板书上：使用定滑轮不能省力，但可以改变用的方向。………………………………【全文请点击下载word压缩文档】点击下载此文件