四年级科学上册1.4《风向和风速》学案(无答案)教科版.doc

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1、1风向和风速一、学习目标1、风可以通过自然界中事物的变化来感知,可以用风向和风速来描述。 2、自制简易风向标和小风旗。用自制的风向标和小风旗测量风向和风速,并使用适当的方法记录观察结果。 3、感受到使用简单工具能对天气观察活动提供很大的帮助。进一步提高观察天气现象的兴趣和好奇心。2、学习过程温故互查: 1、( )对天气的影响很大,是( )中重要的记录数据。 2、每天气温变化的特点是( )。 3,。猜谜导入。合作交流: (一)风向和风向标 1、阅读第 9 页,理解风向是指风吹来的方向,可以用八个方位来描述风向。观察风向图研究风向与方位的联系。 2、通过红旗随风飘动或树枝随风摇动的情况来辨别风向。

2、小组成员互查纠错。3、了解风向可以用风向标来测量,风向标的箭头指向的是风吹来的方向。 4、制作风向标,并测量风向。 (1)阅读自制风向标的方法,运用课前准备的材料自制风向标。 (2)小组讨论:风向标的使用方法 (3)小组交流:我们还可以用哪些方法确定方位和测量风向? (4)汇报点评。 (二)风速和风速等级 1.理解风速的概念。 2、知道风速可以用风向仪进行测量,了解风速仪的结构和原理。 3、熟悉“蒲福风力等级”表。 (3)怎样描述风速1、讨论我们的风速等级怎样确定?(根据风气的情况) 22、研究制作小风旗的方法。 3、分组制作小风旗,研究使用方法4、实地观察。(1)、测量风向和风速。 (2)、记录到天气日历中。 巩固练习: 1、风向是指( ),可以用( )来测量。通常用( )个方位来描述。2、风速是( ),可以用( )来测量。 3.气象学家通常把风速记为( )个等级。 拓展延伸: 大家对风向和风速有了充分的认识,课外请把风对生产和生活的影响进行调查,每组写一份调查报告。

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