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06机械能守恒定律能量守恒定律目录01机械能转化及守恒的判断····················································2考向一：机械能转化及守恒的判断········································································202机械能守恒定律的应用·······················································7考向一：机械能的图像类问题··············································································7考向二：单个物体的机械能守恒··········································································15考向三：多个物体(系统)的机械能守恒··································································1803能量转化及守恒定律的综合应用··········································20考向一：能量转化及守恒定律的综合应用······························································20考向四：涉及弹簧的能量问题·············································································22考向二：涉及板块、传送带的能量问题·································································33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机械能转化及守恒的判断考向一：机械能转化及守恒的判断1．（2023·浙江·高考真题）一位游客正在体验蹦极，绑上蹦极专用的橡皮绳后从跳台纵身而下。游客从跳台下落直到最低点过程中（）A．弹性势能减小B．重力势能减小C．机械能保持不变D．绳一绷紧动能就开始减小2．（2023·重庆·高考真题）（多选）某实验小组测得在竖直方向飞行的无人机飞行高度y随时间t的变化曲线如图所示，E、F、M、N为曲线上的点，EF、MN段可视为两段直线，其方程分别为和。无人机及其载物的总质量为2kg，取竖直向上为正方向。则（）A．EF段无人机的速度大小为4m/sB．FM段无人机的货物处于失重状态C．FN段无人机和装载物总动量变化量大小为4kg∙m/sD．MN段无人机机械能守恒3．（2022·浙江·高考真题）神舟十三号飞船采用“快速返回技术”，在近地轨道上，返回舱脱离天和核心舱，在圆轨道环绕并择机返回地面。则（）A．天和核心舱所处的圆轨道距地面高度越高，环绕速度越大B．返回舱中的宇航员处于失重状态，不受地球的引力C．质量不同的返回舱与天和核心舱可以在同一轨道运行D．返回舱穿越大气层返回地面过程中，机械能守恒4．（2022·湖南·高考真题）（多选）神舟十三号返回舱进入大气层一段时间后，逐一打开引导伞、减速伞、主伞，最后启动反冲装置，实现软着陆。某兴趣小组研究了减速伞打开后返回舱的运动情况，将其运动简小学、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化为竖直方向的直线运动，其图像如图所示。设该过程中，重力加速度不变，返回舱质量不变，下列说法正确的是（）A．在时间内，返回舱重力的功率随时间减小B．在时间内，返回舱的加速度不变C．在时间内，返回舱的动量随时间减小D．在时间内，返回舱的机械能不变5．（2021·浙江·高考真题）如图所示，同学们坐在相同的轮胎上，从倾角相同的平直雪道先后由同高度静止滑下，各轮胎与雪道间的动摩擦因数...