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2026年中考物理试题精选天天练7.16(初二升初三)暑期物理自学

2026年中考物理试题精选天天练7.16(初二升初三)暑期物理自学

1.(2026•贵州)将一根质量不计的长木条放在三角形木块上,两支质地均匀、长短不同的圆柱形蜡烛分别置于木条两端,调整木块的位置,使木条刚好在水平位置平衡,如图所示。仅对两支蜡烛进行的下列操作中,仍能使木条在水平位置平衡的是(  )

A.相互交换位置

B.各截去一半长度

C.向支点移动相同距离

D.同时点燃,消耗相同质量

2.(2026春•鼓楼区期末)关于分子动理论及有关现象,下列说法不正确的是(  )

A.“破镜难圆”说明分子间存在斥力

B.糖醋汤汁腌制糖蒜利用的是扩散现象

C.水和酒精混合后总体积变小,说明分子之间存在间隙

D.人可以闻到花香,说明分子在不停地做无规则运动

3.(2026春•鼓楼区期末)如图甲,作用在同一物体上的两个力(F1F2)作用在同一直线上。当两个力方向相反时,力的作用效果如图(a)所示;当两个力方向相同时,力的作用效果如图(b)所示。如图乙,小明用一轻质弹簧测力计将质量相同的物体AB连接起来,并在A的右侧用大小为8N的拉力F水平向右拉动,使物体AB一起在粗糙的水平桌面上向右做匀速直线运动,此时弹簧测力计的示数为2N,下列说法正确的是(  )

A.物体A受到的摩擦力大小为8N,方向水平向左

B.物体A受到的摩擦力与物体B受到的摩擦力大小相等,方向相反

C.物体A的下表面更粗糙

D.如果把物体AB调换位置,使物体AB仍一起在相同的水平桌面上向右做匀速直线运动,则此时弹簧测力计的示数仍为2N

4.(2026春•鼓楼区期末)如图甲所示,物块A25NB5N,用100N的水平推力FA压在竖直墙上,若AB一起匀速下滑时,A受到的摩擦力大小为_____N;若推力F保持不变,取走物体B,如图乙所示,物体A继续下滑时受到的摩擦力_____(选填“变大”“不变”或“变小”,下同);若减小水平压力,A未脱离墙面,则A受到的摩擦力将_____ 

5.(2026春•鼓楼区期末)(1)如图甲所示,一盏质量为0.2kg的灯笼被风吹得向左偏,请画出灯笼所受重力和绳子拉力的示意图。(O点表示灯笼的重心)(2)如图乙所示,木块静止在水平地面时受到向右摩擦力,请画出此时木块受到的弹力。(3)如图丙所示,一木箱从斜面上匀速向下滑,请画出斜面对木箱的力的示意图。

6.(2026春•鼓楼区期末)小华在课外探究弹簧的伸长量与拉力F的关系,记录了实验数据,并根据数据得出了如图甲所示的图像(L为弹簧长度)。

1)分析甲图,可得到的结论是:________

2)小华利用完全相同的小桶分别盛满三种液体,用该弹簧制成的测力计称出液体和小桶的总重力,记录的部分数据如下表:(ρ酒精=0.8g/cm3

通过分析此表,小华发现了液体密度与弹簧测力计示数之间的关系。在图乙所示的图像中能正确反映这一关系的是____(选填字母)。

试根据表中的数据计算出酱油的密度为____g/cm3,小桶的重为____N

3)小华又利用该弹簧测力计及小桶,将弹簧测力计改装成可以直接读取液体密度的弹簧密度计(相邻刻度线的间隔为1mm),每次小桶装满液体。该弹簧密度计能测液体密度的最大值为____g/cm3,其分度值为_______g/cm3

7.(2026春•鼓楼区期末)在“探究影响滑动摩擦力大小的因素”的实验中,小明按照图甲、乙、丙三种情况进行了实验,其中A为木块、B为重物。

1)实验中,小明应该沿水平方向拉动木块做______运动;

2)比较______(填实验序号)两图的实验,可探究滑动摩擦力的大小与接触面粗糙程度的关系:

3)甲、乙两实验可以得出的结论是_________

4)小明又设计了丁图的实验方案,若水平拉力F3.5N,弹簧测力计稳定后的示数为1.5N,现增大拉力F。弹簧测力计的示数_____(选填“变大”、“变小”或“不变”)。

5)在如图戊所示的五种情景中,小明用弹簧测力计拉着小木块使其沿平行接触面方向做匀速直线运动,其中弹簧测力计对小木块的拉力和小木块所受的摩擦力是一对平衡力的有_____(选填序号);如图所示进行实验时,若运动过程中木块的速度突然变大,则木块受到的滑动摩擦力将_______(选填“变大”、“变小”或“不变”)。

8.(2026春•鼓楼区期末)小明和小华一起测量小石块和鸭蛋的密度,实验步骤如下:

1)小明将天平放在水平台面上,他忘记将游码移到标尺左端零刻度线处,直接调节平衡螺母使横梁平衡,则这样测得的小石块的质量____(选填“偏大”、“偏小”或“不变”);

2)正确调好天平平衡后,用天平测出小石块的质量,砝码和游码位置如图乙,小石块的质量是______g

3)在量筒中装入适量的水,读出水的体积为30mL;用体积不计的细线将小石块拴住后浸没在装有水的量筒中,过一段时间后,水面位置如图丙,则小石块的体积为_____cm3,小石块的密度为_____kg/m3

4)同组的小华发现小石块具有吸水性,会导致测出小石块的密度_____(选填“偏大”或“偏小”);

5)他们接着用电子秤、玻璃杯和水测量鸭蛋的密度,测量步骤如图丁所示,依次读出图中电子秤显示的质量。分析计算时,他发现只要读出图中的三个质量就能求出鸭蛋的密度,其中有一个图的质量是必须要读出的,这个图是_____(填字母)。若读出BCE三次的质量分别是mBmCmE,则鸭蛋的密度ρ______(用mBmCmEρ表示),该结果_____(填“受”或“不受”)鸭蛋取出时带走水多少的影响。

9.(2026•贵州)列车进站时,在列车与候车旅客之间会形成快速气流,从而在旅客身体两侧形成气压差,气压差产生的空气推力有可能将人推向列车造成危险。如图甲所示,候车时不跨越安全线是每位旅客必须遵守的规则。那么,“人此时所受空气推力F的大小与其身体两侧空气流速的大小有什么关系呢?”

为了探究这一问题,某同学设计并组装了如图乙所示(俯视图)的实验装置:将一根透明塑料管固定于水平桌面,有低、高风速挡的电吹风靠近左侧管口,再将一个直径略小于塑料管内径的圆柱形轻质泡沫块用细线与弹簧测力计连接,然后把泡沫块置于管内正中间,测力计拉环固定于桌面,此时测力计示数为零。整个装置处于无风环境。

请完成以下探究并回答问题:

1)电吹风沿垂直塑料管的方向吹风,此时泡沫块左侧空气的压强比右侧压强____,泡沫块在空气推力的作用下向左运动拉伸测力计。泡沫块与管壁间的摩擦忽略不计,则其稳定后所受空气推力的大小____测力计示数(选填“大于”、“小于”或“等于”)。

2)先后用电吹风的低、高风速挡吹风,泡沫块稳定后,测力计的示数依次为F1F2,比较发现F1F2,由此可知:仅在一侧吹风时,空气流速越大,泡沫块所受的推力_____

3)在真实场景中,列车进站时,站台上旅客身体两侧均有空气流动,且离列车较近一侧的空气流速更快,而本实验仅在泡沫块左侧吹风。为贴合真实场景,若在右侧管口再放置一个相同的电吹风,使两电吹风同时同向吹风,左侧电吹风使用高风速挡,则右侧电吹风应该选择_____挡进行实验。设泡沫块再次稳定后测力计的示数为F3,请判断F2F3的大小关系,并写出你作此判断的推理过程:_________

10.(2026春•鼓楼区期末)按照行业规定:白酒的度数是指气温在20℃时、100mL酒中所含酒精的毫升数。若白酒厂生产的每瓶装“500mL,42度”(不考虑勾兑时体积变化,酒精的密度是0.8×103kg/m3),求:

1)白酒中酒精的质量是多少?

2)水的质量是多少?

3)这种酒的密度是多少?

说明:今天的题目题量不多,难度也不大,但是每条题目的阅读量极大,非常考验学生的耐心,梅花香自苦寒来,努力加油吧!

答案:

重点题解析:

基本 文件 流程 错误 SQL 调试
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  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=b68a0f934defa39a73a37fbb2d9a7bd5
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  1. CONNECT:[ UseTime:0.000822s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001147s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011716s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.029917s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001142s ]
  6. SELECT * FROM `set` [ RunTime:0.003369s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001225s ]
  8. SELECT * FROM `article` WHERE `id` = 870878 LIMIT 1 [ RunTime:0.008235s ]
  9. UPDATE `article` SET `lasttime` = 1784713531 WHERE `id` = 870878 [ RunTime:0.036786s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.014903s ]
  11. SELECT * FROM `article` WHERE `id` < 870878 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.122463s ]
  12. SELECT * FROM `article` WHERE `id` > 870878 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.032595s ]
  13. SELECT * FROM `article` WHERE `id` < 870878 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.195649s ]
  14. SELECT * FROM `article` WHERE `id` < 870878 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.189111s ]
  15. SELECT * FROM `article` WHERE `id` < 870878 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.201652s ]
1.068278s