【2017年整理】六下2杠杆的平衡.ppt

（A） （B） ＞ ＜ 费力杠杆 省力杠杆 阻力作用点 支点 动力作用点 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. = 既不省力也不费力的杠杆 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. 探究形式：同桌两人一组 实验材料： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 实验步骤： A在杠杆尺的左侧任选一个挂钩作为阻力点， B在杠杆尺的右侧任选一个挂钩作为动力点； A在阻力点挂上任意数量的回形针，B在动力点上挂回形针，想办法使杠杆尺保持平衡； 将实验记录写在p7表格上。 A 改变阻力点位置，两人继续步骤2-4。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 钩码挂的位置就是阻力点的位置。 钩码挂的位置 就是动力点的位置。 阻力 用力 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 注意：每一边只能挂一串勾码！！ 阻力 用力 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 左边(阻力点)情况 右边(用力点)情况 支点到阻力点的距离(格) 钩码数(个) 支点到动力点的距离(格) 钩码数(个) 实验记录表 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 左边(阻力点)情况 右边(用力点)情况 支点到阻力点的距离(格) 钩码数(个) 支点到动力点的距离(格) 钩码数(个) 1 2 2 1 4 2 1 8 3 2 1 6 2 2 4 1 3 4 2 6 4 2 2 4 …… …… …… …… 实验记录表 你发现了什么规律？ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 杠杆平衡条件: 支点到阻力点的距离 支点到动力点的距离 阻力点勾码数 动力点勾码数 × × = Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 研究杠杆 阻力 用力 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 阻力 用力 研究杠杆 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 用力 阻力 研究杠杆 Evaluation only. Created