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【免费下载】精编天津市津南区20202021学年八年级下学期第一次月考物理试题

  • 2026-01-12 13:19:10
【免费下载】精编天津市津南区20202021学年八年级下学期第一次月考物理试题

学年天津市津南区八年级(下)第一次月考物理试卷

一、

单项选择题(本大题共10小题,每小题3分,共30分)每小题给出的四个选项中,只有一

个最符合题意。

1. 一个初中生受到的重力大约是(  )

A. 5NB. 50NC. 500ND. 5000N

2. 当一个人站在坚硬的水泥地面上时,水泥地面(  )

A. 发生了形变,受到了人施加的压力的作用

B. 发生了形变,受到了人施加的重力的作用

C. 没有发生形变,因为地面太坚硬了

D. 没有发生形变,因为人太轻了

3. 作用在一个物体上的两个力,分别为F1=3N、F2=5N,并且这两个力在同一条直线上,则F1F2的合力(  )

A. 一定是8NB. 一定是2N

C. 可能是3N或5ND. 可能是2N或8N

4. 关于9.8N/kg所表示的物理意义正确的是(  )

A. 9.8N等于1kg

B. 9.8kg等于1N

C. 质量是1kg的物体受到的重力是9.8N

D. 质量是9.8kg的物体受到的重力是1N

5. 如图所示,无风时,站在地面上的小蚂蚁骄傲地托着果实.对于该静止的果实,下列说法正确的是( )

A. 果实受到重力和蚂蚁的支持力作用,这是一对平衡力

B. 果实受到重力和蚂蚁的支持力作用,这是一对相互作用力

C. 果实能够静止,是因为蚂蚁对它的支持力小于果实受到的重力

D. 果实能够静止,是因为蚂蚁对它的支持力大于果实受到的重力

6. 用天平和弹簧测力计分别在地球和月球上测同一物体,测量的结果是(  )

A. 天平、弹簧测力计测的都不同

B. 天平、弹簧测力计测的都相同

C. 天平测的不同,弹簧测力计测的相同

D. 天平测相同,弹簧测力计测的不同

7. 如图所示,运动员将足球从后场踢到前场,足球在空中运动的过程中,不计空气阻力,其受力的情况是(  )

A. 受重力B. 受踢力

C. 踢力和重力D. 不受力作用

8. 公共汽车在平直的公路上匀速行驶,站在车里的人在水平方向上(  )

A. 受到向前的摩擦力B. 受到向后的摩擦力

C. 受到汽车对它的牵引力D. 不受力

9. 下列实例中,为了增大摩擦的是(  )

A. 向自行车的转轴处加润滑油

B. 鞋底刻有凹凸不平的花纹

C. 拉杆旅行箱底部装有轮子

D. 在新用的拉链上抹一点石蜡

10. 如图所示,C是水平地面,A、B是两个长方形物块,F是作用在物块B上沿水平方向的力,物体A和B以相同的速度做匀速直线运动.由此可知,关于A、B间摩擦力F1和B、C间摩擦力F2的分析中,正确的是(  )

A. F1=0,F2=0B. F1=0,F2≠0C. F1≠0,F2=0D. F1≠0,F2≠0

二、不定项选择题(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,有几个符合题意,全部选对的得3分,选对但不全的得1分,不选或选错的得0分。

11. 某同学在使用弹簧测力计之前,发现弹簧测力计的指针在0.2N的位置,为了使测量准确,这个同学提出了以下调整方法,其中正确的是(  )

A. 把指针扳动到“0”刻度线

B. 测出拉力后,再减去0.2N

C. 因为实验总有误差,直接读出数值就可以

D. 以上方法都可以

12. 关于力的概念,下面的说法中正确的是(  )

A. 力是物体对物体作用,离开物体就没有力的作用

B. 一个物体对另一个物体施力时,同时也受到另一个物体对它的作用力

C. 我们通常说物体受到力的作用,一定还有一个施力物体,只不过省略不谈了

D. 当一个物体受到力的作用时,其施力物体不一定存在

13. 关于运动和力的关系,下列说法正确的是(  )

A. 物体不受外力时,运动状态不变

B物体不受外力时,就会静止

C. 物体的运动状态发生改变时,一定受到了外力作用

D. 力是使物体运动状态发生变化的原因

三、填空题(本大题共6小题,每小题4分,共24分)

14. 甲、乙两同学各用2N的力在水平桌面上沿相反方向拉一弹簧测力计,则弹簧测力计的示数是________N,弹簧测力计所受合力是___________N.

15. 一切物体在没有受到力的作用时,总保持_____状态或匀速直线运动状态,这就是牛顿第一定律。行驶的汽车突然刹车时乘客会向_____(填“前”、“后”)倾倒。

16. 一辆行驶的汽车车厢里挂着一个小球.当出现了如图所示的情景时,汽车在做__(选填“加速”、“匀速”或“减速’)运动.此时绳子对球的拉力和球受到的重力__(选填“是”、“不是”或“可能是”)一对平衡力.

17. 质量是10kg的物体,受到的重力大约是_____N,一个物体受到的重力是1N,则它的质量是_____kg。g10N/kg

18. 竖直向空中抛出一个小石子,石子离开手后仍继续向上运动的原因是___________;石子在上升过程中,速度越来越小,其原因是___________________.

19. 如图所示,弹簧测力计测量范围是______,指针所示被测物重力是___N.

四、综合题(本大题共7小题,共37分)解题中要求有必要的分析和说明,计算题还要有公式及数据代入过程,结果要有数值和单位。

20. 如图所示是长在枝条上的苹果,请你在图中画出苹果受力的示意图.

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  1. CONNECT:[ UseTime:0.000534s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000565s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000291s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000165s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 460659 LIMIT 1 [ RunTime:0.012372s ]
  9. UPDATE `article` SET `lasttime` = 1768217372 WHERE `id` = 460659 [ RunTime:0.007748s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 460659 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000398s ]
  12. SELECT * FROM `article` WHERE `id` > 460659 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000643s ]
  13. SELECT * FROM `article` WHERE `id` < 460659 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.023167s ]
  14. SELECT * FROM `article` WHERE `id` < 460659 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.040328s ]
  15. SELECT * FROM `article` WHERE `id` < 460659 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.135194s ]
0.293562s