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热点5 功能关系和能量守恒_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_学生版

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热点5 功能关系和能量守恒_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_学生版
热点5 功能关系和能量守恒_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_学生版
热点5 功能关系和能量守恒_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_学生版

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热点 5 功能关系和能量守恒 1.(2022·四川绵阳市二诊)虽然北京冬奥会已经过去了,但人们对冰雪运动依然热情高涨. 如图所示为滑雪滑道PQR,质量为60 kg的滑雪爱好者(连同装备)从顶端P静止滑下,从末 端R滑出时速度为18 m/s,滑行过程中姿势保持不变,P端相对滑道最低点Q高度为24 m,R端相对Q点高度为4 m.从P到R滑行过程中,该滑雪爱好者克服阻力做功和重力做 功的比值约为(重力加速度取g=10 m/s2)( ) A.0.1 B.0.2 C.0.8 D.1 2.(多选)(2022·黑龙江大庆市第三次质检)如图所示,足够长粗糙斜面固定在水平地面上,绕 过光滑定滑轮的轻绳连接质量相等的物块A和B(可看作质点),当一沿斜面向下的恒力F作 用在物块A上,使其加速下滑的过程中(物块B始终未与斜面、滑轮相碰),则下列说法中 正确的是( ) A.恒力F做功大于物块A、B动能增量之和 B.恒力F做功等于物块A、B动能增量之和 C.物块A与斜面因摩擦产生的热量与物块B的机械能增量之和等于恒力F做功 D.物块A克服绳的拉力做功一定大于物块A的重力势能减少量 3.(多选)(2022·湖南卷·7)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,将其运动简化为竖直方向的直线运动,其v-t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0~t 时间内,返回舱重力的功率随时间减小 1 B.在0~t 时间内,返回舱的加速度不变 1 C.在t~t 时间内,返回舱的动量随时间减小 1 2 D.在t~t 时间内,返回舱的机械能不变 2 34.(多选)将质量为1 kg的物体从倾角为θ的固定斜面底端以某一初速度v 上滑,向上运动过 0 程中物块的动能和重力势能随位移变化的图像如图所示.取斜面底端水平面为参考平面, 重力加速度g为10 m/s2.下列说法正确的是( ) A.物体初速度v 的大小是2 m/s 0 B.物体与斜面间的动摩擦因数μ=0.5 C.物体回到出发点的动能为4 J D.物体上升过程中重力的冲量大于下降到出发点的过程中重力的冲量 5.(2022·山东枣庄市二模)如图甲所示,倾角为θ=37°的传送带以v=2.0 m/s的速度顺时针 匀速转动,传送带的长度L =10.0 m.一个可视为质点的质量m=1.0 kg的物块,自A点 AB 无初速度地放在传送带底端,其被传送至B端的过程中,动能E 与位移x的关系图像如图 k 乙所示.重力加速度取g=10 m/s2,sin 37°=0.6,cos 37°=0.8.下列说法正确的是( ) A.物块与传送带之间的动摩擦因数为0.25 B.整个过程中合外力对物块做的功为4.0 J C.整个过程中摩擦力对物块做的功为64.0 J D.整个过程中摩擦力对物块做的功等于物块机械能的增加量 6.(多选)(2022·云南省统测)如图所示,足够长的固定斜面上,长为 L的ab段粗糙,其余部 分光滑,斜面与水平面的夹角为θ.轻杆两端分别连接滑块P、Q,P的质量为2m,Q的质 量为m,两滑块与ab段间的动摩擦因数均为μ.已知斜面顶端与a点的高度差为h,两滑块 均可视为质点且轻杆长度不计,重力加速度为g.则两滑块从斜面顶端由静止开始下滑,直 到滑块P滑离a点(此时滑块Q仍在斜面上)的过程中,下列说法正确的是( ) A.Q到达b点前,轻杆对Q的弹力为0 B.Q刚好滑入ab段的瞬间,P的加速度大小为 C.P、Q和轻杆组成的系统损失的机械能为3μmgLcos θ D.P滑离a点时的速度大小为 7.(2022·重庆实验外国语学校模拟)如图所示,光滑的小滑轮D(可视为质点)固定,质量均为m的物体A和B用轻弹簧连接,一根不可伸长的轻绳一端与物体A连接,另一端跨过定 滑轮与质量为M的小环C连接.小环C穿过竖直固定的光滑均匀细杆,小环C位于R处时, 轻绳与细杆的夹角为θ,此时物体B与地面间刚好无压力.图中SD水平,位置R和Q之间 高度差为h,R和Q关于S对称.现让小环从R处由静止释放,环下落过程中轻绳始终处于 拉直状态,环到达Q处时获得最大速度.重力加速度为g,忽略空气阻力.在小环从R处 下落到Q处的过程中,下列说法正确的是( ) A.小环C机械能最大的位置在S点下方 B.弹簧弹力和地面支持力对物体B的冲量和为零 C.小环C的最大动能为 D.小环C到达位置Q时,物体A的加速度大小为
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  1. CONNECT:[ UseTime:0.000881s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001516s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002225s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000898s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001410s ]
  6. SELECT * FROM `set` [ RunTime:0.001086s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001675s ]
  8. SELECT * FROM `wendang` WHERE `id` = 372527 LIMIT 1 [ RunTime:0.001040s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 372527 [ RunTime:0.011726s ]
  10. UPDATE `wendang` SET `lasttime` = 1773109068 WHERE `id` = 372527 [ RunTime:0.001893s ]
  11. SELECT * FROM `wendang` WHERE `id` < 372527 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002181s ]
  12. SELECT * FROM `wendang` WHERE `id` > 372527 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001608s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 372527 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001705s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 372527 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001458s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 372527 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001324s ]
0.112198s