2012年北师大版初中数学七年级下6.4速度的变化练习卷(带解析)

适用年级:初一
试卷号:637865

试卷类型:课时练习
试卷考试时间:2017/7/20

1.单选题(共5题)

1.
某产品的生产流水线每小时生产100件产品,生产前没有产品积压,生产3h后安排工人装箱,若每小时装产品150件,未装箱的产品数量y是时间t的函数,那么,这个函数的大致图象只能是下图中的(   )
A.B.
C.D.
2.
一人骑自行车从家里出发,先加速行驶一段路程后,又匀速骑了一段路程,路中遇一熟人,减速后停下来,讲了一阵话,后以加速行驶到一定速度后匀速行驶,接着又减速行驶到目的地,下列图中,哪一幅是表示上述情况的( )
A.B.C.D.
3.
让一只乒乓球在桌面上上下弹跳6s,下面的图像表示了它弹跳距离桌面的高度随时间变化的情况,下面的结论正确的是(   )

­
A.乒乓球一共弹跳了6个来回;
B.乒乓球每个来回经过的时间相等
C.乒乓球一共弹跳了240cm的路程
D.乒乓球每次从桌面弹跳到最高点的过程中,前40cm和40cm花的时间相等,都是0.5s.
4.
水滴进玻璃容器如图所示(设单位时间内进水量相同),那么水的高度是如何随时间变化的,请选择分别与A、B、C、D区配的图像 (   )


­
A.(3)(2)(4)(1)­B.(2)(3)(1)(4)C.(2)(3)(4)(1)­D.(3)(2)(1)(4)
5.
下面的图像表示了一辆汽车从出发到目的地之间的速度随时间变化的情况.下列说法正确的是(   )

­
A.汽车在5个时间段匀速行驶;
B.汽车行驶了65min
C.汽车经历了4次提速和4次减速的过程;
D.汽车在路途中停了2次,停车的总时间不足10min.

2.选择题(共15题)

6.已知函数f(x)=x3﹣x+3.

(Ⅰ)求f(x)在x=1处的切线方程;

(Ⅱ)求f(x)的单调递增区间.

7.已知函数f(x)=x3﹣x+3.

(Ⅰ)求f(x)在x=1处的切线方程;

(Ⅱ)求f(x)的单调递增区间.

8.

阅读理解

      What would the world be like if cars could drive themselves? Imagine seeing an empty car passing by on its way to pick up its owner, or a car full of passengers who are reading, listening to music or even sleeping. But none of them are worried about the road ahead.

      Well, all of this could be the future of driving. There are several companies, including Google, working on driverless cars. So far, no Google self-driven car has gotten a traffic ticket, but some of them have been in accidents when other cars hit them.

      These cars are now still in the testing stages. But, if the tests are successful, these electric self-driven cars could be put into use very soon.

      The cars already have many features(特点)allowing them to take the place of drivers during certain situations. Some features include cars being able to park themselves, or slow down when they notice objects close by. They can also control the speed if there are dangerous conditions.

      Scientists and engineers believe, with the help of wireless signals, cameras and GPS, we are now at a stage where creating a safe self-driven car might be possible.

      The cause of deadly road accidents is usually careless drivers or dangerous conditions. The self-driven car may be able to prevent these. However, some people do not like the idea. American lawyer Whit Drake, for example, doesn't believe these cars are safe. He thinks that technologies can also be mistakes.

9.

阅读理解

      What would the world be like if cars could drive themselves? Imagine seeing an empty car passing by on its way to pick up its owner, or a car full of passengers who are reading, listening to music or even sleeping. But none of them are worried about the road ahead.

      Well, all of this could be the future of driving. There are several companies, including Google, working on driverless cars. So far, no Google self-driven car has gotten a traffic ticket, but some of them have been in accidents when other cars hit them.

      These cars are now still in the testing stages. But, if the tests are successful, these electric self-driven cars could be put into use very soon.

      The cars already have many features(特点)allowing them to take the place of drivers during certain situations. Some features include cars being able to park themselves, or slow down when they notice objects close by. They can also control the speed if there are dangerous conditions.

      Scientists and engineers believe, with the help of wireless signals, cameras and GPS, we are now at a stage where creating a safe self-driven car might be possible.

      The cause of deadly road accidents is usually careless drivers or dangerous conditions. The self-driven car may be able to prevent these. However, some people do not like the idea. American lawyer Whit Drake, for example, doesn't believe these cars are safe. He thinks that technologies can also be mistakes.

10.已知a>b>0,求证: {#mathml#}aba+b{#/mathml#} + {#mathml#}2b2a2+b2{#/mathml#} <1.
11.用数学归纳法证明:12﹣22+32﹣42+…+(﹣1)n1n2=(﹣1)n1 {#mathml#}n(n+1)2{#/mathml#} .
12.

阅读理解



13.

阅读理解

      If you have failed in the past to try to make big changes in life, try again now, one tiny step at a time.

      Every year it's the same. As December comes to an end, you think about the new year and all the ways you want to improve your life. But as you start to write down your hopes for the new year, you think about the last year. You excitedly write down all the changes you are going to make, but by the end of January those ideas get lost in your busy life. 

      Here's a suggestion: Forget the too big, hard-to-achieve goals and just think about the small ones. “We often think that we have to do everything in big steps, even though it's so hard for us to reach it.” said Robert Maurer, who recently wrote the book One Small Step Can Change Your Life. “What we try to do is to begin with such a small step that we can't find any excuse not to do it.”

    “Kaizen”, a Japanese word, is used to mean to change behavior and attitudes (态度). During World War II, American factory managers were able to increase productivity by trying small, continuous improvements instead of sudden changes. After the war, the idea was brought to a rebuilding(重建) Japan. It made Japan develop fast. The Japanese called it “kaizen”, which means “improvement”.

     Maurer studied the idea and did some experiments with it. “Kaizen” could possibly help people succeed in doing everything. 

14.

阅读下面材料,在空白处填上适当的内容(1个单词)或括号内单词的正确形式。将答案填写在答题纸的相应位置。

      Long long ago, there was a small village in the Middle East. In the village there was an old man called Sthira. He lived by {#blank#}1{#/blank#}(he). His only son had {#blank#}2{#/blank#}(go) far away to study. Sthira's friends wondered whether his son would return, But Sthira always said, "Whatever happens, happens for good.”

      One day {#blank#}3{#/blank#}   old man's son returned and the villagers were very happy for Sthira. He thanked them and said {#blank#}4{#/blank#}(polite), "Whatever happens, happens for good.” {#blank#}5{#/blank#}, later, Sthira's son broke his leg. Once again the villagers came to visit him and once again the old man thanked them and said, "Whatever happens, happens for good."Some of the villagers were surprised {#blank#}6{#/blank#} (hear) this. Why? What was good? His {#blank#}7{#/blank#}(son) leg got badly hurt!

      After a few days, the army came to the village and forced all the young {#blank#}8{#/blank#}(man) to join the army. When they found his son had a broken leg, they left him {#blank#}9{#/blank#}. Once again, all the villagers came to congratulate him on his good luck. Like always, the old man was still {#blank#}10{#/blank#}(thank) to them and said. “Whatever happens, happens for good.”


15.

阅读下面材料,在空白处填上适当的内容(1个单词)或括号内单词的正确形式。将答案填写在答题纸的相应位置。

      Long long ago, there was a small village in the Middle East. In the village there was an old man called Sthira. He lived by {#blank#}1{#/blank#}(he). His only son had {#blank#}2{#/blank#}(go) far away to study. Sthira's friends wondered whether his son would return, But Sthira always said, "Whatever happens, happens for good.”

      One day {#blank#}3{#/blank#}   old man's son returned and the villagers were very happy for Sthira. He thanked them and said {#blank#}4{#/blank#}(polite), "Whatever happens, happens for good.” {#blank#}5{#/blank#}, later, Sthira's son broke his leg. Once again the villagers came to visit him and once again the old man thanked them and said, "Whatever happens, happens for good."Some of the villagers were surprised {#blank#}6{#/blank#} (hear) this. Why? What was good? His {#blank#}7{#/blank#}(son) leg got badly hurt!

      After a few days, the army came to the village and forced all the young {#blank#}8{#/blank#}(man) to join the army. When they found his son had a broken leg, they left him {#blank#}9{#/blank#}. Once again, all the villagers came to congratulate him on his good luck. Like always, the old man was still {#blank#}10{#/blank#}(thank) to them and said. “Whatever happens, happens for good.”


16.

根据下列句子及所给单词的首字母,在答题卷上写出各单词的完整形式 (每空限填一词)。

17.

根据下列句子及所给单词的首字母,在答题卷上写出各单词的完整形式 (每空限填一词)。

18.

根据下列句子及所给单词的首字母,在答题卷上写出各单词的完整形式 (每空限填一词)。

19.

根据下列句子及所给单词的首字母,在答题卷上写出各单词的完整形式 (每空限填一词)。

20.

完形填空

    “Mommy, I got something for you!” Cody ran through the door after school. His face wore the biggest smile ever. He waved something above his head. “It’s a pen. But not just any pen. It’s a lucky pen!” He handed me the pen    1   , waiting for my reaction(反应).

I looked at the pen in my hand. There was nothing   2   about it. It looked just like any other ballpoint pen. I had a drawer full of them. At that moment, I didn’t realize how special it was or how much I would come to treasure(珍爱)it.

    I had made the decision to be a(n)    3   . I had dreamed about it for a long time but I was afraid of being refused by the publishing houses. The night before, I told my husband my  4 when I thought Cody wasn’t listening. “What if  5    likes my writing and I fail?” But Cody did   6   what I said. Now he stood in front of me, watching me examine the pen. “You don’t have to be afraid now,” he said. “This pen will make your   7  great and everyone will love you.”

    Tears filled my eyes. Refusal and failure didn’t seem like such a big problem any more. Even if I    8 sold the first book, I had everything I could ever need. I knew that pen would bring me luck, though. And I felt   9  already, just by having Cody in my life, especially when I heard what he did to get it.

    In the lunchroom, Cody heard an older boy talking about having a lucky    10 . He decided to get it for me. The boy was a tough negotiator(强硬的谈判者) but Cody didn’t 11  . In the end, he   12   his favorite Matchbox car, two army men his brother gave him, a crayon, and a piece of candy---his most important things, for that pen. Just to make   13   feel better.

    I still have that pen, though it’s long out of ink, in a cup on my desk. When a refusal letter arrives and I start feeling  14 , I look at it and remember just how lucky I am. For while I value that pen, it’s Cody who I really   15  in my life.

3.填空题(共2题)

21.
李小勇的爸爸让他去商店买瓶酱油,下图近似地描述了李小勇和家之间的距离与他离家后的时间之间的关系,则

­(1)李小勇去买瓶酱油共花了___min,其中在路上行走了____min,他走路的平均速度是_____;
­(2)李小勇在买酱油的过程中有_______次停顿,其中第_____次是因为买酱油付钱而停顿的;
(3)李小勇在途中另一处停顿的原因是_____________.(只要写得合理都对)
22.
假定甲、乙两人在一次赛跑中,路程S与时间t的关系如图所示,看图填空:

­(1)这是一次_______赛跑;
(2)甲、乙两人中先到达终点的是_________;
(3)乙在这次赛跑中的平均速度是_________m/s.

4.解答题(共4题)

23.
汽车在山区行驶过程中,要经过上坡、下坡、平路等路段,在自身动力不变的情况下,上坡时速度越来越慢,下坡时速度越来越快乐,平路上保持匀速行驶,如图表示了一辆汽车在山区行驶过程中,速度随时间变化的情况.
(1)汽车在哪些时间段保持匀速行驶?时速分别是多少?
(2)汽车遇到了几个上坡路段?几个下坡路段?在哪个下坡路段上所花时间最长?
(3)用自己的语言大致描述这辆汽车的行驶情况,包括遇到的山路,在山路上的速度变化情况等.
24.
小欣外出办事,先以12km/h速度骑自行车前进半小时,再乘公共汽车以40km/h速度行驶20min,接着以6km/h速度步行30min,休息10min后,又以5km/h速度步行20min,到达目的地,在这个过程中,哪个是自变量哪个是因变量,画出表示自变量与因变量关系的图像.
25.
某辆汽车行驶路程与时间的关系如图所示,描述这辆汽车的行驶情况,并分别计算前3h内,前5h内和全程的平均速度,描述这辆汽车的行驶情况,这辆汽车共行驶多长时间?多少路程?
26.
如图,是李老师骑自行车上班途中,骑车路程与时间的关系,根据图像合理想像李老师上班途中的情况.
试卷分析
  • 【1】题量占比

    单选题:(5道)

    选择题:(15道)

    填空题:(2道)

    解答题:(4道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:1

    7星难题:0

    8星难题:0

    9星难题:10