《大题小做》与《小题大做》.ppt

“大题小做”与“小题大做” ————北京八中初三物理组 2013年3月 二、小题大做 桌上有如下实验器材：弹簧测力计、细线、装水的烧杯。请利用以上器材测出一枚小石块的密度 你能否利用以上实验器材测出一杯未知液体的密度呢？ 小伟只找到了天平、砝码、装水的烧杯、细线。请帮他测出石块的密度. 小伟发现利用上述器材还可以测量出可乐的密度。 ………… 7. 看了小龙的实验后，小阳想出了一种利用刻度尺测量块密小石块密度的方法。她找来了刻度尺、小塑料碗、装适量水大烧杯。小阳利用这些物品进行实验。请你帮忙写出实验步骤以及石块密度的表达式。 LOGO Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 一、大题小做 反思总结 添加元素 简单模型 变换元素 综合分析 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. F A nF=GD+GA η=W 有/W总=GA h/Fs GA-F浮 f A Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. A GD+GA = nF η=GA h/Fs F=G人-F支 B F=F拉-f F拉 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. A GD+GA = nFA η=GA h/FA s FA·LOA=FB·LOB FB +F支=G人 A O B O F’B + G人= F支 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. A B Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 简单 问题 穷追 不舍 多元 变化 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. m ρ V 天平 量筒 弹簧测力计 烧杯+刻度尺 G m g V=Sh G=F浮 ………… Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 树立信心 梳理思路 重视基础 能力提升 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 谢谢！ Evaluation only