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【免费下载】精编江苏省宿迁市沭阳20232024学年九年级上学期第一次学情调研物理试题

  • 2026-02-19 11:40:11
【免费下载】精编江苏省宿迁市沭阳20232024学年九年级上学期第一次学情调研物理试题

学年度初三年级第一次学情调研

物 理试卷

试卷满分: 90分 考试时间: 70分钟

一、选择题(每题只有一个选项符合题意,请把正确答案的序号填在对应的答题框内。每题2分,共24分)

1. 在下图所示的四种剪刀中,最适用于剪开较硬物体的是(

A. B. 

C. D. 

【答案】B

【解析】

【详解】对于杠杆来说,动力臂比阻力臂大的倍数越多,越省力,四个图示中B图中的动力臂最大,阻力臂最小,使用时最省力,故使用B剪刀最容易剪开较硬的物体。故ACD不符合题意,B符合题意。

故选B。

2. 关于功、功率和机械效率,下列说法正确的是(  )

A. 有力作用在物体上,且物体移动了一段距离,说明就有力对该物体做功

B. 使用任何机械都不省功

C. 做功快的机械其机械效率一定高

D. 做功越多的机械其功率越大

【答案】B

【解析】

【详解】A.有力作用在物体上,但物体在力的方向上没有移动距离,力就没有对该物体做功,故A不正确;

B.使用机械都不可避免的需要克服摩擦或机械自重而做额外功,所以使用任何机械都不省功,故B正确;

C.功率表示物体做功的快慢,跟机械效率无关,所以做功快的机械其功率大,但机械效率不一定高,故C不正确;

D.功率的定义:单位时间内物体做功的多少,所以做功越多的机械其功率不一定越大,故D不正确。

故选B

3. 下图所示的四幅图中所描述的力,对物体做了功的是(  )

A. 叉车托着货物停在水平地面上,叉车对货物的力

B. 搬石头但没有搬动,手对石头的力

C. 使小车向前运动了一段距离的推力

D. 提着滑板在水平路面上前行,手提滑板的力

【答案】C

【解析】

【详解】做功的两个必要因素:作用在物体上的力,物体在力的方向上通过一段距离。

A.叉车托着货物停在水平地面上,叉车对货物的力没有做功,因为货物没有在力的方向移动距离,故A不符合题意;

B.搬石头但没有搬动,因为石头没有在力的方向移动距离,手对石头的力没有做功,故B不符合题意;C.使小车向前运动了一段距离的推力,小车在推力的方向上移动了距离,故推力对小车做了功,故C符合题意;D.提着滑板在水平路面上前行,因手提滑板的力方向竖直向上,而滑板(水平通过一段距离)没有在力的方向上移动距离,故手提滑板的力没有对滑板没有做功,故D不符合题意。

故选C

4. 小明用200N的力把静止的重5N的足球踢出.足球沿水平场地向前运动了30m,则足球运动员对足球做的功是

A. 0B. 150JC. 6000JD. 无法计算

【答案】D

【解析】

【详解】因为W=FS,F等于200N,S不确定,所以无法计算.故选D.

【点睛】计算做功的多少,要知道作用在物体上的力,还要知道在该力的方向上移动的距离,而运动员只对球有个瞬间的力,瞬间球运动的距离又无法知道,所以没办法求出运动员对球所做的功.

5. 在日常生活中,用100N的拉力不能提起重150N的物体的简单机械是

A. 杠杆B. 斜面C. 一个定滑轮D. 一个动滑轮

【答案】C

【解析】

【详解】用100N的拉力不能提起重150N的物体的简单机械,说明该机械不是省力机械,定滑轮不是省力机械,它的实质是等臂杠杆,不省力也不费力,而动力臂大于阻力臂的杠杆、斜面和动滑轮都属于省力杠杆,都可以做到,故选C.

6. 甲、乙两人爬楼梯比赛,已知两人体重之比为2:3,爬完相同楼高所用时间之比为4:3,则甲、乙两人爬楼梯的功率之比为(  )

A. 9:8B. 8:9C. 2:1D. 1:2

【答案】D

【解析】

【详解】甲、乙两人爬楼梯比赛,升高的高度相同,由得,甲、乙两人爬楼梯的功率之比为

ABC不符合题意,D符合题意。

故选D

7. 为了粉刷教室,需要将涂料运到五楼。工人师傅可以采用的方法有:用人直接搬运上去;用定滑轮提上去;用动滑轮提上去。在这几种方法中(  )

A. 最省力的是B. 效率最高的是

C. 做有用功最多的是D. 效率最高的是

【答案】B

【解析】

【详解】A.用人直接搬运上去和用定滑轮提上去都不省力,用动滑轮提上去可以省一半的力,故A不符合题意;

C.在三种方式中,重物被提升的高度相同,所以有用功相同,故C不符合题意;

BD.在三种方式中,所做额外功最少的是用定滑轮把涂料提上去,所做额外功最多的是用人直接搬运上去,三种方式所做的有用功相同,所以机械效率最高的是,故B符合题意,D不符合题意。

故选B

8. 疫情期间,从相关方案的设计完成,到正式投入使用,仅用了8天时间就建成的武汉火神山医院,彰显了中国速度。如图所示,为了在最短的时间完成地面基础建设,上百台挖掘机同时工作,其目的是增大所有挖掘机总的(  )

A. 机械效率B. C. 功率D. 有用功

【答案】C

【解析】

【详解】为了在最短的时间完成地面基础建设,上百台挖掘机同时工作,做的总功相同,有用功相同,由

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  1. CONNECT:[ UseTime:0.000581s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000310s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000581s ]
  6. SELECT * FROM `set` [ RunTime:0.000243s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000632s ]
  8. SELECT * FROM `article` WHERE `id` = 469224 LIMIT 1 [ RunTime:0.017425s ]
  9. UPDATE `article` SET `lasttime` = 1771472649 WHERE `id` = 469224 [ RunTime:0.002936s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 469224 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000541s ]
  12. SELECT * FROM `article` WHERE `id` > 469224 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001494s ]
  13. SELECT * FROM `article` WHERE `id` < 469224 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007467s ]
  14. SELECT * FROM `article` WHERE `id` < 469224 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004917s ]
  15. SELECT * FROM `article` WHERE `id` < 469224 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003289s ]
0.109352s