高中物理必修教案动能和动能定理

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1、7.7动能和动能定理Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.回顾物体由于运动而具有的能量叫做动能。在本章“7.1追寻守恒量”中，已经知道Evaluatio

2、nonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.龙卷风海啸风力发电Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPr

3、ofile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.与物体的质量和速度有关思考：物体的动能与哪些因素有关？是什么样的关系？结论：物体的质量越大，速度越大，它的动能就越大。那么，动能与物体的质量和速度之间有什么定量的关系呢？Evaluationonly.CreatedwithAsp

4、ose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.一、探究动能的表达式重力做功WG重力势能mgh弹力做功WF外力做功w弹性势能kx2/2动能表达式？Evaluationonly.CreatedwithAspose.Slid

5、esfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.设质量为m的某物体，在与运动方向总相同的恒力F的作用下发生一段位移l，速度由v1增加到v2，如图所示。试寻求这个过程中力F做的功与v1、v2的关系？Fv1v2Evaluationonly.

6、CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.推导F做功表达式的过程W=FLL=(v22－v12)/2aa=F/mW=?Evaluationonly.CreatedwithAspose.Sl

7、idesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.初态和末态的表达式均为“mv2/2”，这个“mv2/2”代表什么？W＝mv22－mv12末态初态结果与思考Evaluationonly.CreatedwithAspose.Slides

8、for.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.m为物体的质量v为物体的瞬时速度单位：焦耳（J）