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1、第4节 流体压强与流速的关系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.1.了解流体压强与流速的关系 。2.了解飞机的升力是怎样产生的 。3.了解生活中跟流体的压强与流 速相关的现象。
2、 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.z（一）预习内容及要求（请根据学习目标 阅读课本思考并回答以下问题）1、课本P44内容想想做做 硬币向上飞的原因 ：（ ） 2、探究实验飞
3、机的升力。在气体和液体中，流速越大的位置 （ ） z（二）在你预习的过程中，还有哪些自己 不能解决的疑问，请记录下来。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.（一）对着两张平行拿着
4、的纸吹气，你会发现什么现象？为什么？现象：两张纸吸到了一起原因：吹气时，纸条内侧空气流动快，压强变小，纸条外侧空气流动慢，压强大，两纸条被吸到了一起。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
5、 Ltd.（二）、在水面上放两只小船，用水管 向中间的水域水平冲水，观察其现象。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.吹 气漏 斗乒乓球会掉下来吗？（三）、下面我们来看一个更加有
6、趣的实验：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.吹 气 球上方气体流速快，气压小。球下方气体流速慢，气压大。球不掉下的原因Evaluation only.Evaluation o
7、nly. 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.由以上的现象得出的结论是：流体压强压强与流速的关系：在流体（液体和气体）中，流速大 的位置压强小，在流速小的位置 压强大。Evaluation only.Evaluation only. Crea
8、ted 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.乘客为什么必须站在安全线以外的位置 候车? Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profi
9、le 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.这是非洲草原犬鼠洞穴的横截面示意图犬鼠的洞穴有两个出口，一个是平的，另一个则是隆起的土堆。这是为什么呢？（从物理学的角度分析）Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.
10、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.草原犬鼠的空调系统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.
11、2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.航海规则规定两艘船不能近距离 同向航行！这又是为什么呢？你知道吗？（试用有关知识加以解释）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 2004-201
12、1 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1物理学中把具有流动性的液体和气体统 称_体，当流体流动时，流速越大的位 置其压强_；流速越小的位置其压强 _2.秋天,当一辆高速行驶的汽车 驶过时,路旁飘落的黄叶 ( ) A.从路旁飞向汽车 B.不受影响 C.从路中间飞向路边 D.只向上飞扬Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for
13、 .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3如图所示，A、B是两个上端开口的 容器，它们构成的是一个_；当用 一个管子沿B容器口吹气时，A容器中的 液面会_（填“上升”、“下降”或“不 变”）连通器 下降Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose
14、.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.飞机是如何升空的呢?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-
15、2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.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.上方流速快，压强小下方流速慢，
16、压强大合压强：P飞机获得升力的原因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.飞机的升力由于在相同的时间里机翼上方气流通过的路程长，空气流速比下方快，因而气流在机翼上表面产生的压强小于在下表面的压强。机翼上下表面的压强差使飞机产生了向上的升力。 Evaluation only.E
