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17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列

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17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列
17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列
17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列
17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列
17.“压强综合”-2024年中考物理重难点突破及题型归类总复习_02中考总复习(2026版更新中)_04-物理-中考总复习_2024年中考复习资料_专项复习资料_2024年中考物理复习辅导系列

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 17.“压强综合”重难点突破及题型归类 一、固体压强之叠加问题 技巧:先找受力面积(公共面积),再找受力面积上方的压力! 1.已知:G 、G 、S 、S 。 甲 乙 甲 乙 (1)把甲放在乙上,求甲对乙的压强、乙对地的压强。 F G F +F G +G p  甲  甲 p  甲 乙  甲 乙 甲乙 S S 乙地 S S 乙 乙 乙 乙 (2)把乙放在甲上,求乙对甲的压强、甲对地的压强。 F G F +F G +G p  乙  乙 p  甲 乙  甲 乙 乙甲 S S 甲地 S S 乙 乙 甲 甲 二、固体压强之切割问题 1.横切 注意:根据 ,S不变,由F的变化确定p的变化 未切 切后 归纳 原压强p,切掉 ,切后压强 2.竖切 注意:根据p=ρgh来判断——竖切压强不变! 资1 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 3.斜切 图示 备 注 极限思维:S 无穷小—→p 无穷大 乙 乙 归纳 F相同,S小的p大 三、液体压强之p与G的关系 例1.ρ =ρ =ρ 、h =h =h 、S =S =S A B C A B C A B C 1.液体对容器底的压力、压强:p =p =p 、F=F =F A B C A B C 注意:先压强后压力! 2.液体对容器底压力与重力的关系:F>G 、F >G 、F >G A A B B C C 注意:F 指S为容器底面积,h为液体深度的立方体对底部产生的压力,如图中红色框。 水→底 例2. S =S =S ,h =h =h ,m =m =m ,ρ ≠ρ ≠ρ ,液体对容器底的压强 p > p > p 甲 乙 丙 甲 乙 丙 甲 乙 丙 甲 乙 丙 甲 乙 丙 。 资2 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 解析: m 甲 =m 乙 =m 丙   m V   >  V p 甲 乙 丙 h =h =h  甲 乙 丙 甲 乙 丙 四、液体压强之容器倒置问题 例3. 结 论 分 析 容器对桌面的压力 F=F F =G A B 压 总 水对容器底部的压强 p

F′ 红框部分产生的压力:F′>G, F ′>G A B A B 五、液体压强计算 技巧:“先压强后压力”——p=ρgh F=pS 例4.平底茶壶的质量为400g,底面积是40cm2,内盛0.6kg的开水,水面高12cm,放置在面积为 1m2的水平桌面中央。求: (1)液体对壶底的压强; (2)液体对壶麻的压力; (3)茶堂对桌面的压力; (4)茶壶对桌面的压强。 解:(1)p =ρ gh= kg/m3×10N/kg× m= Pa 液→壶 水 (2)F = p S = × m2= N 液→壶 液→壶 壶 (3)F =G =G +G =(m +m )g=( + )×10N/kg= N 壶→桌 总 水 壶 水 壶 (4) 资3 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 答案:1200Pa,4.8N,10N,2500Pa 六、粗测大气压值——针筒实验 1.实验器材 2.实验原理: 。 3.实险步骤 ①把注射器的活塞推至注射器的底端, 排尽筒内的空气 ,然后用橡皮帽封住注射器的小孔; ②用尼龙绳拴住注射器的颈部,使绳的一端与弹簧测力计的挂钩相连,然后水平向右缓慢拉动注射 器筒,当活塞刚开始滑动时,记下 弹赛测力计的拉力 ,即等于大气对活塞的压F; ③用刻度尺测出注射器的 全部刻度长度 ,记为L,读出注射器容积V,则活塞的面积 。 ④最后计算出此时大气压的数值 。 4.思考:如果正确测量、读数,但最终测量结果总比大气压标准值小,其主要原因是 注射器漏气 。 七、粗测大气压值——吸盘实验 1.实验器材 2.实验原理: 。 3.实验步骤 ①如图所示,将沾水的塑料吸盘压在光滑的水平板上,排尽吸盘内的空气; ②把小桶和吸盘用细线连接起来,向小桶中缓慢注入细沙,直到吸盘恰好脱离板面; ③用天平测出细沙和小桶的质量m; ④用刻度尺测出吸盘的半径r; ⑤大气压强的表达式为: 。 4.注意事项: ①吸盘沾水的原因是防止漏气; ②实验中可能存在误差的原因:吸盘内有空气;吸盘半径测量不准;吸盘脱离平板后仍有少量细沙 注入等。 资4 料整理【淘宝店铺:向阳百分百】关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 资5 料整理【淘宝店铺:向阳百分百】

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  1. CONNECT:[ UseTime:0.000909s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001390s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000736s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000716s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001310s ]
  6. SELECT * FROM `set` [ RunTime:0.000609s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001501s ]
  8. SELECT * FROM `wendang` WHERE `id` = 329354 LIMIT 1 [ RunTime:0.001004s ]
  9. UPDATE `wendang` SET `liulancishu` = 4 WHERE `id` = 329354 [ RunTime:0.001399s ]
  10. UPDATE `wendang` SET `lasttime` = 1772308288 WHERE `id` = 329354 [ RunTime:0.001080s ]
  11. SELECT * FROM `wendang` WHERE `id` < 329354 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001362s ]
  12. SELECT * FROM `wendang` WHERE `id` > 329354 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001217s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 329354 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002825s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 329354 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002559s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 329354 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002888s ]
0.193597s