山西省忻州市第一中学高中物理11.3简谐运动的回复力和能量预习案(无答案)新人教版选修3_4.doc

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1简谐运动的回复力和能量【教学目标】1通过回顾牛顿第二定律,理解回复力的含义,掌握回复力与振动位移的关系,依此判定某一振动是否为简谐运动。2通过讨论,会用动力学的方法,分析简谐运动中位移、速度、回复力和加速度的变化规律。3能用能量守恒的知识,知道简谐运动是一种没有能量损耗的理想运动,会分析振动过程中的动能、势能、总能量的变化规律。【预习任务】一、精读教材“简谐运动的回复力”部分。1记忆-简谐运动的另一种定义是:2记忆-回复力的定义是:二、精读教材 “简谐运动的能量”部分,为更好的理解内容做好准备。*1理解-试根据简谐运动的特点,完成课本“思考与讨论”中的表格。位置 A AO O OB B位移的大小速度的大小动能势能总能量2理解-简谐运动是一种理想化的模型。3拓展思考:(1)人拍皮球时,皮球是否做机械运动?是否做简谐运动?(2)利用所学知识分析简谐运动中 x 和 F、a、v 的变化规律。2【自主检测】1关于水平方向的弹簧振子做简谐运动时的能量,下列说法正确的是( )A等于在平衡位置时的动能B等于在最大位移时弹簧的弹性势能C等于任意时刻振子的动能和弹性势能之和D位移越大,振动的能量也越大【组内检查】1回复力的定义 2简谐运动的能量变化规律

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