小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com第05讲三大性质力目录01、考情透视，目标导航02、知识导图，思维引航...........................................................................................................................203、考点突破，考法探究...........................................................................................................................4考点一重力弹力........................................................................................................................................4知识点1重力和重心............................................................................................................................4知识点2弹力........................................................................................................................................4考向1重力与重心................................................................................................................................5考向2弹力的有无及方向判断............................................................................................................6考向3弹力的大小计算........................................................................................................................7考点二摩擦力...........................................................................................................................................10知识点1.两种摩擦力的比较..............................................................................................................10知识点2．关于摩擦力的四个易错点...............................................................................................11考向1静摩擦力的有无及方向判断..................................................................................................11考向2静摩擦力大小的计算..............................................................................................................13考向3滑动摩擦力大小的计算..........................................................................................................14考点三摩擦力的四类突变.......................................................................................................................16知识点1“静—静”突变.....................................................................................................................16知识点2“静—动”突变.....................................................................................................................16知识点3“动—静”突变...............................................................................................................16知识点4“动—动”突变.....................................................................................................................16考向1“静—静”突变........................................................................................................................17考向2“静—动”突变........................................................................................................................17考向3“动—静”突变........................................................................................................................18考向4“动—动”突变....................................................................................................................