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1、名师精编优秀教案第五章第七节向心力导学案编写：刘少强审稿：赵明昆编写时间：2010-3-17 班级姓名组别【学习目标】1.理解向心力的概念和公式表示，知道它是匀速圆周运动中物体受到的指向圆心的合外力2.能结合实际问题分析向心力的来源【重点，难点】1.重点是向心力的概念的理解，具体问题中向心力来源的分析2.难点是变速圆周运动合力的作用效果分析【学法指导】探究、讲授、讨论、练习【知识链接】向心力的概念和公式，力和加速度的关系【学习过程】一、向心力的概念1.做匀速圆周运动的物体运动过程中有加速度吗？若有，方向怎样？2.物体运动的加速度和受到的合力间有什么关系？做匀速圆周运动的物体合力方向总沿什么方向
2、？为了表征这个特征，我们将它叫做_ 二、向心力的公式1.做匀速圆周运动的物体线速度为v,半径为 r,则向心加速度公式为_，由牛顿第二定律公式_可得向心力的表达式为_ 2.阅读课本20 页实验，回答（1）由公式算出向心力的大小，必须直接测量的物理量是_,_,间接要求出来的物理量是 _,如何进行测量和求解？（2）画出钢球受力示意图（不计摩擦），已知m,则合力为 _,若测出圆半径 r 和钢球距悬点的竖直高度h，则合力可表示为_(3)比较两种情况下合力F 的大小，就可以验证向心力表达式是否正确三、.向心力来源分析实例1.分析课本22 页第二题，给出你的解答2.分析课本22 页第三题，做给出出你的解答名
3、师精编优秀教案3.向心力是以力的_命名的，不是像重力，弹力，摩擦力一样的_力，结合以上两题谈谈你是如何理解的？四、变速圆周运动1.做变速圆周运动的物体合力方向还指向圆心吗？按力的作用效果可把F 沿_和_方向分解，谈谈这两个分力的名称和作用效果2.甲和乙两图分别表示两个做变速圆周运动的物体在某一位置时的速度方向和合力方向，你能判断它们的线速度分别如何变化吗？3.向心力公式F=mv2/r2对变速圆周运动适用吗？此时F 还是表示物体的合力吗？【知识应用】1.圆锥摆装置中，已知钢球做匀速圆周运动的半径是r，悬线与竖直方向夹角为则 小 球 运 动 的 线 速 度 为 _,角 速 度 为 _，周 期 为_
4、 2.分析课本23 页第四题，并给出你的回答3.分析课本23 页第五题，并给出你的回答【当堂检测】文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V5文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V5文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V5文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V5文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V5文档编码:CK1L5K9C1X10 HB2K10R2D4G4 ZC6C4I4E9V
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