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动态地调控课堂心理气氛，对于增强教学效果，其作用微妙而奇特。

动态地控制知识的数量、难度与传递速度，从而保证课堂教学的深度和广度，保证教学目的的实现。课堂试验课表明：构建真实的问题情景，有利于学生在45分钟内自主地开展学习活动；提供全面的学习资源，有利于诱发学生思维，突出知识的发生、形成和发展的教学过程；形成过程的动态组织，有利于使教学过程处于一种最佳的输出与接受的“匹配”状态。这样的课堂教学可以让不同层次的学生都拥有同等的参与机会，可以为不同层次的学生都提供成功的机会，从而使学生获得真正意义上的主动。

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教案教学实录

学习目标：

(1)知识目标：理解机械波是机械振动在介质中的传播，是传递机械能的一种方式。了解横波和纵波的特点。

(2)过程方法：用动态演示及模拟说明机械波形成过程，启动学生观察、分析、归纳的能力，促进学生的积极思维，获取和转化教学信息。

 (3)情感态度价值观：养成实事求是分析实际问题的习惯，加深对唯物观点的理解。

机械波