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一、选择题(本大题共10小题，每小题6分，共60分。每小题至少一个答案正确，选不全得3分)

1.下列关于重力、弹力和摩擦力的说法，正确的是( )

A.静摩擦力的大小在零和最大静摩擦力之间

B.劲度系数越大的弹簧，产生的弹力越大

C.动摩擦因数与物体之间的压力成反比，与滑动摩擦力成正比

D.物体的重心一定在物体上

2.码头上两个人用水平力推集装箱，想让它动一下，但都推不动，其原因是( )

A.集装箱太重

B.推力总小于摩擦力

C.集装箱所受合外力始终为零

D.推力总小于最大静摩擦力

3.在某场比赛中，姚明接球投篮，球已出手。下面是几位同学关于此时此刻球受力的说法，其中正确的是(空气阻力忽略不计)( )

A.球只受到重力的作用

B.球只受到一个沿运动方向的力的作用

C.球不受任何外力作用

D.球受到姚明给的一个力和重力的共同作用

4.一铁块m被竖直悬挂的磁性黑板紧紧吸住不动，如图所示。下列说法错误的是（）

A.铁块受到四个力作用，其中有三个力的施力物体均是黑板

B.铁块与黑板间在水平方向有两对相互作用力——互相吸引的磁力和相互作用的弹力

C.磁力和弹力是互相平衡的力

D.磁力大于弹力，黑板才能吸住铁块不动

5.一运动员双手握住单杠，双臂平行使身体悬空，当两手间的距离增大时，每只手所受的拉力F T以及它们的合力F的大小变化情况是( )

增大，F也增大增大，F减小

增大，F 不变 减小，F 不变

6.如图所示，在水平力Ｆ作用下，重为Ｇ的物体沿竖直墙匀速下滑，若物体与墙之间的动摩擦因数为μ,则物体所受摩擦力的大小为( ) A.μF B.μF+G D.22F G +

7.在光滑水平桌面上放一刻度模糊的弹簧测力计，两位同学各用200 N 的水平力拉弹簧的两端，测得弹簧伸长4 cm ，则弹簧测力计的读数F 和弹簧的劲度系数k 分别为( ) =400 N ，k=100 N/cm

=400 N ，k=50 N/cm

=200 N ，k=×104

N/m

=200 N ，k=×103 N/m

8.如图所示，质量为m 的等边三棱柱静止在水平放置的斜面上。已知三棱柱与斜面之间的动摩擦因数为μ,斜面的倾角为30°,则斜面对三棱柱的支持力与摩擦力的大小分别为

( )

31131133A.

mg mg B.mg mg C.mg mg D.mg mg 22222222

μμ和和和和 9.小船被绳索拉向岸边，如图所示，船在水中运动时设水的阻力大小不变，那么在小船匀速靠岸的过程中，下列说法正确的是( )

A.绳子的拉力F T 不断增大

B.绳子的拉力F T 不变

C.船受的浮力减小

D.船受的浮力增大

10.如图所示，电灯悬于两壁之间，保持O点及OB绳的位置不变，而将绳端A点向上移动，则( )

A.绳OA所受的拉力逐渐增大

B.绳OA所受的拉力逐渐减小

C.绳OA所受的拉力先增大后减小

D.绳OA所受的拉力先减小后增大

三、计算题

11.(12分)气球被水平吹来的风吹为如图所示的情形，若测得绳子与水平面的夹角为37°，水平风力F=24 N，气球的重力G=2 N，试求气球受到的空气浮力的大小和绳子拉力的大小。

12.(14分)如图所示，轻质弹簧的劲度系数为20 N/cm,用其拉着一个重200 N的物体在水平面上运动。当弹簧的伸长量为4 cm时，物体恰在水平面上做匀速直线运动。求：

(1)物体与水平面间的动摩擦因数。

(2)当弹簧的伸长量为6 cm时，物体受到的水平拉力有多大？这时物体受到的摩擦力有多大？

13.(14分) 在倾角为30°的光滑斜面上放着一个质量M=2 kg的物体A，由轻绳与质量为m 的物体B相连，如图所示，A和B都处于静止状态，求B物体的质量为多大？(g取10 N/kg)

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2014 -2015 学年度高一下学期周练卷（五） 姓名：_______________ 班级：________________ 学号：_______________ 一.短文改错。 请你修改你同学写的以下作文。文中有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。 I used to feel I was the sun in my family. But when my cousin was born, everyone pays more attention to her. So I disliked her and couldn?t get along well with her. With time went on, I realized how ridiculous I have been at that time. I tried to find a proper time to apologize. When my cousin?s family came to my home a few day ago, I took my cousin to play outside. In the way to the playground, I bought much snacks for her. Then we began chat. When we talked about their childhood, suddenly, I said “sorry” gentle. She was silent, so I thought that she hadn?t heard me clearly. But after while she said: “Don?t say that. In my memory, you are always friendly.” 二.完形填空（1-20题） Once the king of India was ill and sent for his doctor. The doctor came, ___1__ him and said, “You will be well soon in a few days if you take a bull?s milk.” The king was ___2 _ , for he had never heard of a bull that gave milk. “How is it __ _3__ ?” he asked. “Order Gulbo to get it for you,” answered the doctor. “He can do anything.” Gulbo was a person with great knowledge and was a(n) ___4___ to the doctor. So the doctor thought this would be a way of making him ___5__ . When the king told Gulbo what the doctor said and ____6____ him to get a bull?s milk, Gulbo _____7_____ understood what the doctor was trying to do. When he got home, he sat thinking how to get out of the ____8___ . His daughter, seeing him worried, asked what was the ____9____ . On hearing what the king had asked for, she said, “Don?t ____10___ , Father, I will help you.” The next day she took some old clothes, went to the bank of the river near the palace and chose a place ___11__ the king?s bedroom window. In the middle of the night, she started to do her washing. She made ___12___ much noise that the king could not sleep. The king got very angry and sent a guard to ____13___ what had happened. The soldier found the girl and led her to the king. “Why do you wash your clothes here at night?” said the king. The girl ____14___ to be afraid and said, “I had to wash clothes at night. This afternoon my father ___15___ a baby, I was busy all day because of that. Then I found there were no clean __ 16 for th e baby, so I had to come and wash them now.” “What!” cried the king. “Are you trying to make a17 of me?” I have never heard of a man having a baby.” “Well, if the king himself orders someone to get a bull?s milk for him,18 can?t a man have a baby?” The king smiled and said, “You must be Gulbo?s19 . Go and tell your father that he may keep the bull?s milk to his20 . 1. A. checked B. tested C. judged D. examined 2. A. pleased B. surprised C. touched D. moved 3. A. possible B. impossible C. usual D. unusual 4. A. friend B. enemy C. neighbor D. patient 5. A. suffer B. benefit C. trap D. arrest 6. A. begged B. ordered C. decided D. demanded 7. A. suddenly B. certainly C. correctly D. directly 8. A. chance B. situation C. position D. difficulty 9. A. matter B. wrong C. thing D. problem 10. A. frighten B. worry C. doubt D. fear 11. A. above B. on C. below D. under 12. A. such B. that C. more D. so 13. A. find out B. get out C. take out D. bring out 14. A. began B. looked C. became D. pretended 15. A. gave birth to B. had birth in C. gave birth of D. had birth to 16. A. food B. clothes C. bowls D. bottles 17. A. trick B. joke C. friend D. fool 18 A. why B. how C. who D. what 19. A. girl B. daughter C. wife D. friend 20. A. daughter B. son C. sister D. baby 三.阅读理解（21-35题）