2012年初二下学期物理期末试卷及答案(海港区).pdf

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1、海港区 20112012 学年度第二学期期末考试初二物理试卷题号一二三四总分得分一、单项选择题（每题 3 分，共 42 分）1.赛龙舟是我国民间传统习俗。小丽和她的同学一起在公园人工湖上举行龙舟比赛，使龙舟向前行驶的力的施力物体是（）A船桨B湖水C同学D龙舟2关于力的认识，下列说法中错误的是（）A力是物体对物体的作用B力能使物体发生形变或改变物体运动状态C物体间力的作用是相互的D只有相互接触的物体才会产生力的作用3某人用力推静止在地面上的桌子，但没有推动，原因是（）A人推桌子的力小于桌子受到的摩擦力B人推桌子的力等于桌子受到的摩擦力C人推桌子的力小于桌子的重力D人推桌子的力等于桌子的重力4根据

2、力与运动的关系，图1 中小明和小华的观点（）A小明正确B小华正确C都正确D都不正确5 4 月 18 日零时起，我国铁路开始了第六次大提速。“和谐号”动车组高速列车经过时，若人离铁轨太近容易被吸进铁轨，应特别注意安全。从物理学的角度看，这是因为高速行驶的列车与人之间的（）A空气流速减小，压强增大B空气流速减小，压强减小C空气流速增大，压强增大D空气流速增大，压强减小6图 2 所示各实验中，用来测量大气压强的实验是（）图 17.如图3，两只相同的烧杯分别装有质量相等的煤油和水，则两只杯子底部受到液体的压强应该是（）P甲P乙 P乙P甲 P甲=P乙无法判断8 在公园平静的湖水中，经常能看到从湖底产生的

3、气泡向上升。则气泡在水中向上升的过程中，下列说法正确的是（）A.气泡所受的液体压强不变B.气泡所受的液体压强变大C.气泡所受的浮力变大D.气泡所受的浮力不变9.下列工具：羊角锤钓鱼杆筷子镊子开酒瓶用的起子，其中属于费力杠杆的是（）ABCD10.下列说法中正确的是（）A用手从地面提起水桶，手的拉力对水桶做了功B提着水桶在路面上水平向前移动一段路程，手的拉力对水桶做了功C抛出手的铅球在空中向前运动的过程中，推力对它做了功D用力推一辆汽车，汽车静止不动，推力在这个过程中对汽车做了功11关于简单机械，下列说法中正确的是（）A定滑轮不仅能改变力的大小而且能改变力的方向B使用滑轮组不仅省力而且省功C做功越

4、多的机械，其机械效率就越高D功率越大的机械，做功就越快12.用如图 4 所示的装置把一个物体匀速拉起，不计摩擦，则下列说法中正确的是（）A动滑轮的质量越大，机械效率越高B拉起的物体质量越大，机械效率越高C拉起物体的速度越大，机械效率越高D物体被拉起的越高，机械效率越高图 4 图 3 图 2文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB

5、2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码

6、:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2

7、HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5

8、ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档

9、编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B

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11、5 ZB2O1U7N2O613.下面的四幅图中属于动能转化为重力势能的是（）14 如图 5，钢珠沿竖直平面上的光滑轨道abcd 从 a 点运动到d 点的过程中，钢珠（）A通过 d 时的速度比通过c 时大B在 c 点比在 b 点的重力势能小C从 a 运动到 b的过程中，动能转化为重力势能D从 b 运动到 c的过程中，机械能转化为重力势能二、填空题（每空1分，共 24分）15如图 6 所示为一电工钳，其构造简单，携带方便，且功能较多，很实用。它在结构和使用上应用了不少物理知识请完成下列问题：（1）电工钳刀口很簿，用到的物理知识是。（2）电工钳属于杠杆。（选填“省力”、“费力”、“等臂”）（3）电工

12、钳的手柄套上带有花纹的橡胶皮的用途是：（说出 1 条）。16小明同学把一个重为3N 的苹果放入水中，苹果在水里处于悬浮状态，则苹果所受的浮力为_N。小明从水中取出苹果，分成一个大块和一个小片（如图 7 所示），再将小片放入水中，发现小片沉入水底，据此现象可以推断：若将大块浸没于水中，松手后大块将会_（选填“上浮”、“悬浮”或“下沉”）。17如图8 所示，图中的滑轮是定滑轮；图甲中滑轮的作用是；图乙中滑轮的作用是。18阅读下列材料，按要求回答问题。小 轮 车小轮车是指车轮半径为20 英寸的自行车。车身一般采用合金材料制成，可以承受从几米高的地方快速落下的冲力。车把可以转动360 度，前后轮都装有

13、供脚踩的“火箭筒”等。BMX（小轮车）运动是近年来兴起的一项极富挑战性的新型体育运动。图 5图 6图 7F甲G F乙G 甲乙图 8文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5

14、ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档

15、编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B

16、2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T

17、5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6

18、文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C

19、2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6小轮车比赛属于平地花式赛，它最基本的动作有后轮点地跳、前轮点地跳、擦轮、定车、飘、过桥等。赛场上，运动员首先用力蹬车加速上升，越过最高

20、坡道，而后又疾驰而下，跨过不同坡道，不断上升、下降，最终冲向终点。比赛过程中，优秀运动员一次可跨越几个坡道。新课 标第一网（1）运动员用力蹬车可加速上升，表明力可以改变物体的，到达坡道最高点时自行车仍要继续向前运动，这是因为自行车具有。（2）运动员骑车离地飞跃到最高空时，受力（选填“平衡”或“不平衡”）。下落过程中，重力势能转化为能。（3）试说出两处自行车上涉及到的简单机械名称及部位：；。（4）提出一个与你所学物理知识有关的问题，并解答：问题：？解答：。19.如图 9 所示，斜面长5m，高 3 m，小明用绳子沿斜面将重为300N 的木块由斜面底端匀速拉到顶端，拉力大小为240N，绳重不计。则小

21、明对木块做的有用功是J；斜面的机械效率是；木块与斜面间的摩擦力是N。20唐诗中有“黄河远上白云间”“不尽长江滚滚来”的诗句，前一句生动形象地表明黄河储藏着大量的能，后一句表明长江具有大量的能。21小明爱好轮滑，当他从坡上自由滑下时，重力势能，动能，机械能。（选填“变大”、“不变”和“变小”）。三、作图与实验题（共22分）22（4 分）（1）如图 10 所示，使用撬棒把石块撬起有两种方法，第一种在撬棒D 点沿DM 方向用力撬起石块1，撬棒的支点是点；第二种在撬棒D 点沿 DN 方向用力撬起石块1,在图中画出动力的力臂；若石块压在棒上的B 点正好是AC 的中点，你认为第种方法更省力一些，理由是_。

22、（2）（2 分）如图 11 所示，用滑轮组沿水平地面拉动物体A，请画出最省力的绕绳方法。F 图 9 图 10图 11文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7

23、N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W

24、1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2

25、X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1

26、U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM

27、8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6

28、Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O623（5 分）小明想粗略测量自己上楼梯时的功率，请你帮他设计实验方案：（1）实验所需的器材：（2）实验步骤：（3）根据测出的物理量，推导出计算功率的

29、公式：P=24（5 分）在物理实验操作考查中，小雨所做的实验是“验证浮力的大小”。他的实验操作步骤如图12 所示，实验过程如下：A用细线将橡皮挂在弹簧测力计下，测出橡皮的_；B将水倒入溢水杯中；C将挂在弹簧测力计下的橡皮浸没水中，让溢出的水全部流入小桶中，同时_；D将盛有溢出水的小桶挂在弹簧测力计下，读出此时弹簧测力计的示数；E记录、分析实验数据，得出实验结论；F整理实验器材。请根据小雨的实验过程回答下面问题：（1）指出小雨在实验操作中漏掉的一个步骤：；（2）指出上面实验操作中的一处错误：；（3）如果用能够漂浮在水面的木块代替橡皮做此实验，那么与上述操作不同的一个步骤是 _（填字母）。25（6

30、 分）某实验小组在测滑轮组机械效率的实验中得到的数据如下表所示，实验装置如图13：实 验 次 数1 2 3 钩码重 G（N）4 4 6 钩码上升高度h（m）0.1 0.1 0.1 绳端拉力F（N）1.8 1.4 2.4 绳端移动距离S（m）0.3 0.5 0.3 机械效率74%（1）通过表中数据可分析出实验1 是用（选填“甲”或“乙”）图做的实验，实验 2 是用（选填“甲”或“乙”）图做的实验。（2）请将表中空白处填上恰当的数据。（百分号前保留整数）（3）通过实验1 和实验 2 的数据分析可得出结论：使用不同的滑轮组，提升相同的重物时，动滑轮的个数越多，滑轮组的机械效率。（4）比较实验1 和实

31、验 3可得正确结论：使用同一滑轮组，可以提高滑轮组的机械效率。Xkb 1.co m甲乙图 12图 13文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编

32、码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2

33、 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5

34、 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文

35、档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2

36、B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10

37、T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6四、计算题（共 12 分）26（4 分）把一个体积为4 10-4m3的物体浸没在水中时，物体受到的浮力是多大？若物体重 3N，当物体在水中静止时，物体受到的浮力是

38、多大？(g 取 10Nkg)27（8 分）俯卧撑是一项常见的体育健身活动。如图14 所示是小明同学做俯卧撑时的示意图。小明重600N，1min 钟内做俯卧撑30 个，每做一次肩膀升高40cm。小明身体可视为杠杆，O 点为支点，A点为重心，OA=1m，B 到 O 点的距离OB=1.5m。求：（1）地面对手的支持力；（2）若每个手掌的面积为0.02m2，求双手对地面的压强；（3）1min 钟内小明所做的功；（4）小明做功的功率。2011-2012学年度第二学期期末试题图 14文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z

39、2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O

40、1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:C

41、M8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV

42、6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB

43、2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码

44、:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2

45、HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6初二物理参考答案一、单项选择题1、B 2、D 3、B 4、D 5、D 6、A 7、C 8、C 9、B 10、A 11、D 12、B 13、C 14、A 二、填空题15、减小受力面积，增大压强省力使接触面粗糙，增大摩擦16、3 上浮新 课标第一网17、甲改变力的方向省力18、（1）运动状态惯性（2）不平衡动（3）轮轴：脚踏板与中轴杠杆：车闸轮轴：车把（4）略19、900J 75%60 2

46、0、重力势动21、变小变大变小三、作图与实验题22、（1）A 一两种方法中阻力和阻力臂相等，而第一种方法动力臂更长，所以更省力（2）图略23、（1）体重计、刻度尺、秒表（2）用体重计测出小明的质量m；用刻度尺楼梯的高度h；用秒表测出小明上楼梯的时间t.（3）mgh/t 24、重力 G 读出弹簧测力计的示数（1）测出小桶的重力（2）B 步骤中水未倒满（3）C 25、（1）甲乙（2）5783（3）越低（4）增大所提升物体的重力四、计算题26、4N（2 分）物体在水中静止时，漂浮在水面，所以浮力等于物体重力，F浮G=3N（2 分）27、（1）400N（2 分）（2）104Pa（2 分）（3）4800

47、J（2 分）（4）80W（2 分）文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7

48、N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W

49、1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2

50、X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1U7N2O6文档编码:CM8W1G5C2B2 HV6Z2X3A10T5 ZB2O1