2019高考物理二轮第一部分力学第一板块第3讲抓住“三类模型”破解竖直面内的圆周运动课件.ppt

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第 3讲抓住 “三类模型 ”,破解竖直面内的圆周运动考法 学法提能点一通过 “绳模型 ”考查竖直面内的圆周运动第 3 讲基础保分类考点 练练就能过关实 例图 示在最高点受力恰好 过最高点拉力或 压 力 为 零小球受向下的拉力或 压 力作用小球不能到达最高点提能点二通过 “杆模型 ”考查竖直面内的圆周运动第 3 讲基础保分类考点 练练就能过关图 示在最高点受力恰好 过最高点v 0, mg F弹在最高点速度可 为 零v 0时 小球受向上的支持力,且 FN mg小球受向上的支持力,且 0FNmg小球除受重力之外不受其他力小球受向下的拉力或 压 力,并且拉力或 压 力随速度的增大而增大提能点三通过 “外轨模型 ”考查竖直面内的圆周运动第 3 讲基础保分类考点 练练就能过关实 例 拱形 桥 等图 示在最高点受力最高点的运 动v 0时 汽 车 受向上的支持力,且 FN mg汽 车 受向上的支持力,且 0FNmg汽 车 除受重力之外不受其他力汽 车 只受重力,而且已 经 脱离地面提能点四循思维流程,突破圆周运动与平抛运动组合问题第 3 讲重难增分类考点 讲练结合过关

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