山西省忻州市第一中学高中物理11.4单摆(二)预习案(无答案)新人教版选修3_4.doc

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1单摆(二)【教学目标】1能通过实验,探究出单摆的周期与摆长的关系。2通过讨论和分析,知道单摆的周期与摆长、重力加速度的关系公式,会用公式进行有关计算。3通过动手操作,会用单摆测定重力加速度。【预习任务】一、阅读教材“单摆的周期”部分。1理解-据图 11.4-4所示的演示实验,定性理解单摆周期的特点:2记忆-在“探究单摆周期与摆长的关系”的实验中要注意的两点。(1)摆的振幅要求(2)摆线和摆球的选择3记住-单摆的周期公式:二、阅读教材“用单摆测定重力加速度”部分,明白周期公式的应用。1理解-根据单摆周期公式测定当地的重力加速度时,应测哪几个物理量?2拓展思考:(1)如果把单摆装置放在高山上,周期和山脚下一样吗?(2)如果把单摆装置放在月球上,周期和地球上一样吗?(3)从参考资料中,找出各种情况下的单摆周期公式。理解等效分析法测等效摆长的方法【自主检测】21在“探究单摆周期与摆长的关系”的实验过程上,摆线要尽量选择_些的、伸缩性_些的,并且要尽可能_一些。摆球要尽量选择质量_些的、体积_些的。2由单摆周期公式可得 g=_,如果测出单摆的摆长 l、周期 T,就可以求出当地的_加速度。3课本问题与练习第 2题。【组内检查】1单摆的周期公式 2用单摆测定重力加速度应测哪几个物理量?

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