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【免费下载】精编天津市东丽区华新共同体20222023学年八年级下学期期中物理试题

  • 2026-02-04 02:27:28
【免费下载】精编天津市东丽区华新共同体20222023学年八年级下学期期中物理试题

2022-2023学年八年级下学期

期中物理试卷

一、单选题(本大题共10小题,每小题3分,共30分)

1. 如图所示的几种现象中,力所产生的作用效果与其它三个不一样的是(  )

A. 手拉开弓B. 运动员罚点球

C. 小明压弯跳板D. 熊猫拉弯竹子

2. 如图,关于物体重力的大小与其质量的关系,正确的是(  )

A. B. C. D. 

3. 如图所示,用力击打一摞棋子中的一个,该棋子飞出而上面的棋子落下。以下说法正确的是(  )

A. 棋子被击打飞出,说明它不具有惯性

B. 棋子被击打飞出,是因为它受到惯性力的作用

C. 击打出去的棋子能飞得很远,是因为它受到惯性的作用

D. 上面的棋子将落在正下方,是由于它们具有惯性且受到重力的作用

4. 如图所示,将物理书放在水平桌面上,下列说法正确的是(  )

A. 书对桌面压力就是书的重力

B. 书对桌面的压力和桌面对书的支持力是一对相互作用力

C. 书对桌面的压力和桌面对书的支持力是一对平衡力

D. 如果书受到的所有的力都消失,它会掉在地上

5. 如图所示,用水平力F把重力为G正方体物块紧压在竖直墙壁上,正方体处于静止状态.关于正方体受到墙壁的摩擦力f,以下说法中正确的是

A. 正方体受到的摩擦力f=F

B. 减小水平力F的大小,摩擦力f一定不变

C. 增大水平力F的大小,摩擦力f一定不变

D. 增大水平力F的大小,摩擦力f也随之增大

6. 如图所示的四个实例中,属于减小摩擦的是(  )

A. 刹车时用力捏闸B. 运动员手上涂防滑粉

C冰壶表面打磨光滑D. 运动鞋底制有花纹

7. 如图所示,容器中间用隔板分成左右两部分,隔板下部有一圆孔用薄橡皮膜封闭。若在容器的左侧装入酒精,在容器的右侧装入等高度的水,则橡皮膜(ρ>ρ)(  )

A. 向右侧凸起B. 向左侧凸起

C. 保持相平,没有凸起D. 无法判断向哪侧凸起

8. 如图所示,有三位同学在同一地点同时做托里拆利实验,其中有一人不小心使玻璃管内混入了少量空气,有一人把玻璃管稍稍倾斜了,只有一人操作完全正确。他们测得玻璃管内水银柱的长度分别为: 725 mm749 mm760 mm。其中用正确方法测得的值是(  )

A. 725 mmB. 749 mmC. 760 mmD. 无法确定

9. 疯狂物理的课堂丰富多彩,下列实验或现象能说明大气压存在的是(  )

A. B. 

C. 形管中液面相平D. 

10. 将一个体育测试用的实心球和一个乒乓球同时没入水中.放手后发现:实心球沉入水底,而乒乓球浮出水面.如图所示,比较实心球和乒乓球没入水中时受到的浮力大小.则( )

A. 实心球受到的浮力大

B. 它们受到的浮力一样大

C. 乒乓球受到的浮力大

D 不能确定

二、多选题(本大题共3小题,每小题3分,共9分。每小题给出的四个选项中,均有多个选项符合题意,全部选对的得3分,选对但不全的得1分,不选或选错的得1分)

11. 关于如图所示的四幅图中,说法正确的是(  )

A. 分别在ABC三处用同样大小的力推门,在C处感觉关上门的难度最大,说明力的作用效果与力的大小有关

B. 锤头松了,人们常用撞击锤柄的方法使锤头紧套在锤柄上,利用了锤头的惯性

C. 活塞式抽水机利用大气压,标准大气压下,能提升水的最大高度约为10.3 m

D. 自制气压计从一楼走上五楼,观察到管内水柱变高,说明大气压随高度的增加而减小

12. 将未装满水且密闭的矿泉水瓶,先正立放置在水平桌面上,再倒立放置,如图所示.两次放置时,水对瓶底和瓶盖的压强分别为pA和pB,水对瓶底和瓶盖的压力分别为FA和FB,则

A. FA>FBB. pA<pBC. FA<FBD. pA>pB

13. 装有适量水的圆柱形容器放在水平桌面上,一边长为a,重力为G的正方体物块静止在水面下某-位置,如图所示。水对正方体上表面的压力为F1,水对正方体下表面的压力为F2,物块所受浮力为F;正方体上表面到水面的距离为h。下列表达式中正确的是(  )

A. 正方体受到浮力

B. 水对正方体下表面的压力

C. 对正方体受力分析可得出

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  1. CONNECT:[ UseTime:0.000585s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000848s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002039s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000324s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.000842s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000709s ]
  8. SELECT * FROM `article` WHERE `id` = 462574 LIMIT 1 [ RunTime:0.015203s ]
  9. UPDATE `article` SET `lasttime` = 1770516008 WHERE `id` = 462574 [ RunTime:0.007278s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.004365s ]
  11. SELECT * FROM `article` WHERE `id` < 462574 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003641s ]
  12. SELECT * FROM `article` WHERE `id` > 462574 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000798s ]
  13. SELECT * FROM `article` WHERE `id` < 462574 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013925s ]
  14. SELECT * FROM `article` WHERE `id` < 462574 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.037878s ]
  15. SELECT * FROM `article` WHERE `id` < 462574 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.050705s ]
0.208932s