文档介绍：中考物理专题复习第三讲质量与密度 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 你真的会用天平吗? 问题一: Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例1.(07 南京)调节天平平衡后,把小石块放在左盘,用镊子向右盘加减砝码,当把砝码盒中最小的砝码放入右盘后,发现指针偏向分度盘的右侧, 接下来正确的操作步骤是: 一、天平的使用取出最小的砝码,再向右移动游码. 使天平再次平衡. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例2 (04苏州)在“用托盘天平称物体的质量”的实验中,下列哪项操作不是必要的?( ) A. 使用天平时,应将天平放在水平工作台面上 B. 调节横梁平衡时,应先将游码移至横梁标尺左端“0”点上 C. 称量时左盘应放置待称量的物体,右盘放置砝码 D. 判断天平横粱是否平衡,一定要等指针完全静止下来 D Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例3 小明在用天平称量质量前调节天平横梁平衡时,指针在分度盘上摆动的范围如图所示,他应该; 如果是在将天平调节平衡后称量的过程中出现这种情况,他应该。向左调节平衡螺母减少砝码或向左移动游码 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例4 如图是物理天平的结构示意图,调节天平横梁平衡时,指针偏左,该如何调节平衡螺母? Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile