《人教案高二物理选修3-5 16.1实验2验证动量守恒定律.ppt

实验：验证动量守恒定律 动量守恒定律 如果一个系统不受外力，或者所受外力的矢量和为0，这个系统的总动量保持不变。 * Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. m1v1＋m2v2＝ m1v1′＋m2v2′ 一维碰撞 质量的测量 速度的测量 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方案1 斜槽、大小相等质量不同的小球两个、重垂线一条、白纸、复写纸、天平、刻度尺、圆规、三角板 实验原理 实验步骤 注意事项 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方案1 数据处理 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 【针对训练】 1．BC 2．B 3．ABC 4．B 5．(1) B、(2) BCD、(3) A、B、F、G 6．(1) (2)守恒 7．AB碰撞不是正碰 应使两球相碰时球心等高，并且球心连线与轨道末端直线平行 8．C Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方案2 橡皮筋 光电门 挡光片 弹簧细线 弹性碰撞架 胶布撞针橡皮泥 气垫导轨、光电计时器、天平、滑块（两个）、重物 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方案3 带细线的摆球（两套）、铁架台、天平、量角器、（胶布） Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方案4 撞针 橡皮泥 光滑长木板、打点计时器、纸带、小车（两个）、天平、撞针、橡皮泥 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 某同学设计了一个用电磁打点计时器验证动量守恒定律的实验：在小车A的前端粘有橡皮泥，推动小车A使之做匀速运动，然后与原来静止在前方的小车B相碰并粘合成一体，继续做匀速运动．他设计的装置如图 (a)所示．在小车A后连着纸带，电磁打点计时器所用电源频率为50Hz，长木板下垫着小木片以平衡摩擦力． (1)若已测得打点纸带如图 (b)所示，并测得各计数点间距(已标在图示上)．A为运动的起点，则应选 段来计算A碰前的速度．应选 段来计算A和B碰后的共同速度(以上两空选填“AB”或“BC”或“CD”或“DE”)． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (2)已测得小车A的质量m1=0.4 kg，小车B的质量为m2=0.2kg，则碰前两小车的总动量为 kg·m/s，碰后两小车的总动量为 kg·m/s． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET