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1、第二章 匀速圆周运动1. 圆周运动Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2.知道圆周运动是变速运动，知道它与一般曲线运 动的关系。 3.理解表示圆周运动的物理量，利用各物理量的定
2、 义式阐述各物理量的含义及相互关系。1.根据实例，归纳圆周运动的运动学特点，知道它 是一种特殊的曲线运动。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.看视频，了解圆周运动Evalua
3、tion only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.看视频，了解圆周运动Evaluation only.Evaluation only. Created with Aspose.Slides for .N
4、ET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.看视频，了解圆周运动Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for
5、 .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1圆周运动定义：物体运动轨迹是圆的运动叫圆周运动 特点：圆周运动的特点是动点到定点的距离保持不变 举例：在圆周运动中，最简单的一种是速率不变的匀速圆周运动 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Sl
6、ides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2匀速圆周运动：如果质点沿圆周运动，且在相等的时间里通过的圆弧长度相等，这种运动叫匀速圆周运动 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Clie
7、nt Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.线速度：若在时间t内，做匀速圆周运动的质点通过的弧长是s，则用比值s/t来描述匀速圆周运动的快慢，这个比值称为匀速圆周运动的线速度 公式：单位：米/秒Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5
8、 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.线速度的方向：圆周运动是曲线运动，则其线速度方向是曲线上该点的切线方向Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright
9、2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.思考：在两个小动物的比赛中，它们同时出发，同时到达终点，线速度大小不同，但都是在相同的时间内跑了一圈，如何描述它们在这方面的运动快慢呢？连接小动物到圆心，发现在相同的时间内连线转过的角度相等，接下来讲述角速度的定义 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET
10、3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.角速度：连接质点和圆心的半径所转过的角度 跟所用时间t 的比值，即单位时间内所转过的角度叫做匀速圆周运动的角速度用 表示：公式： Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 C
11、lient Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.单位：弧度每秒符号：rad/s 匀速圆周运动是角速度不变的运动Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2
12、011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.周期： 做匀速圆周运动的物体运动一周所用的时间叫做周期 用符号 T 表示 单位：秒Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright
13、2004-2011 Aspose Pty Ltd.3线速度、角速度、周期之间的关系 线速度用来描述做圆周运动的物体通过弧长的快慢，角速度用来描述物体与圆心连线扫过角度的快慢 线速度、角速度、周期都可以用来描述圆周运动的快慢，它们之间有什么关系呢？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-20
14、11 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.线速度、角速度、周期之间的关系Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.4匀
15、速圆周运动与一般曲线运动的关系 画一条曲线,分析、讨论匀速圆周运动与一般曲线运动的关系 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.思考：匀速圆周运动的线速度是不变的吗？角速度和周期呢
16、？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1.下列关于与地球自转有关的地球表面上各点的说法，正确的是( )A.线速度随纬度增大而减小B.角速度随纬度增大而减小C.角速度随纬度增大而增大D.自转周期等于一昼夜，即24小时解析：地球自转时，各处角速度相等，线速度等于角速度乘以该纬度圆的半径.AD Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created wit
