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专题01力与物体的平衡目录01受力分析及其应用·····························································2考向一受力分析及相关问题················································································2考向二正交分解法及其应用················································································5考向三活结与死结、动杆与定杆的弹力·································································502单物体、多物体的静态平衡·················································9考向一整体法与隔离法······················································································9考向二共点力的平衡及其应用···········································································1403动态平衡及极值问题························································20考向一动态平衡问题·······················································································20考向二动态平衡问题中的临界与极值问题····························································2304力电、力热综合平衡问题··················································26考向一力电综合静态平衡问题···········································································26考向二力电综合动态平衡问题···········································································31考向三力热综合平衡问题·················································································35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.com01受力分析及其应用考向一受力分析及相关问题1．（2023·重庆·高考真题）矫正牙齿时，可用牵引线对牙施加力的作用。若某颗牙齿受到牵引线的两个作用力大小均为F，夹角为α（如图），则该牙所受两牵引力的合力大小为（）A．B．C．D．【答案】B【详解】根据平行四边形定则可知，该牙所受两牵引力的合力大小为故选B。2．（2022·浙江·高考真题）如图所示，公园里有一仿制我国古代欹器的U形水桶，桶可绕水平轴转动，水管口持续有水流出，过一段时间桶会翻转一次，决定桶能否翻转的主要因素是（）A．水桶自身重力的大小B．水管每秒出水量的大小C．水流对桶撞击力的大小D．水桶与水整体的重心高低【答案】D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【详解】水管口持续有水流出而过一段时间桶会翻转一次，说明主要原因是装的水到一定量之后，导致水桶与水整体的重心往上移动，竖直向下的重力作用...