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1、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.影子产生的条件： 要想看到清晰的影子都需要那些条件呢 ？ 要有光和不透明的物体。 要看到清晰的影子，就必须把光照在不 透明的物体上才能看见。
2、光 不透明的物体 影子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.交流观察，探究特点 一天中太阳位置的变化和影子的关系Evaluation only.Evaluation only.
3、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.小结：阳光下物体影子变化的特点和规律：早晨，影子指向西方； 正午，影子指向正北； 傍晚，影子指向东方。 一天中，正午时影子最短，早晚影子都比较长。你还发现了什么？Evaluation only.Evalua
4、tion 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.阳光下任何不透明的物体都有影子，影子都在物 体背着太阳的一面；在同一时刻，任何直立的物体的 影子方向都是相同的。阳光下物体的影子在一天中有 方向的变化和长短的变化，早晨，影子指向西方；
5、正 午，影子指向正北；傍晚，影子指向东方。一天中， 正午时影子最短，早晚影子都比较长。 太阳位置的变化与阳光下物体影子变化 的特点和规律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.动手
6、作画 。请各个小组长把桌厢里的文件袋拿出来，里面有 三幅没完成的画，请小组内分工合作每两人画一幅，画出物 体在阳光下的影子。互相交流探讨：请各组在下面看一看你们的 影子有没有画错，如果有，请把它改正过来。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.Cop
7、yright 2004-2011 Aspose Pty Ltd.猜猜时间，体验生活 。你能根据影子的变化规律结合课件猜时间 。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)(2)E
8、valuation 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.议一议 ：下图中三幅图是在我国北方某地某 天上午不同时刻的同一位置拍摄的。（ ）（ ）（ ）请将它们按 拍摄的先后顺序进行排列，并说明你的理由
9、。123Evaluation 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.随堂练习一天下午，秦老师先参加了校运会 200m比赛，然后又参加400m比赛，摄影师在同一 位置拍摄了她参加这两场比赛的照片（如下图
10、）。 你认为秦老师参加400m比赛的照片是哪一张？为什 么？（1）（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.太阳和影子光 + 不透明的物体 影子东南影长影长影短Evaluati
11、on 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.课外延伸思考我们的古代人没有现在的手表以及其他计 时工具，他们是怎样知道时间的呢？请同学 们课后查一查资料，下节课我们再一起研究 。 Evaluation
12、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.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.
