《与名师对话·高三课标版物理3-4牛顿运动定律的综合应用(二).ppt

因题目所给的情境中至少涉及两个物体、多个运动过程，并且物体间还存在相对运动，所以应准确求出各物体在各运动过程的加速度(注意两过程的连接处加速度可能突变)，找出物体之间的位移(路程)关系或速度关系是解题的突破口．求解中更应注意联系两个过程的纽带，每一个过程的末速度是下一个过程的初速度． 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1)若B固定不动，令A在B上运动的末速度为v，试确定函数v(v0)的解析式． (2)若v0＝4 m/s且B可在水平面上自由滑动，在A滑上B的同时，给B施加一个水平向右的恒定拉力F： ①若F＝5 N，求物体A从开始运动到距离平板车左端最远处所需时间． ②若要使A不至于从B上滑落，拉力F大小应满足的条件． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [思路启迪]　B固定时，A滑上B在摩擦力作用下做匀减速运动，由牛顿第二定律和运动学公式可写出函数v(v0)的解析式；B不固定且加有外力时，要清楚物体A从开始运动到距离平板车左端最远处时的条件是A、B两者速度相同，而要使A不至于从B上滑落的临界条件是A到达B的最右端时两者共速． 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1)物块相对长木板滑行的距离Δs. (2)物块质量m与长木板质量M之比． 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 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 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evalu