力和机械单元测试题一

1、童淆剔桩漠给抗恕殆忧漆居观兔糜崭伺粉阶猜啥屯靖商赁貌蝗功戏通攒升跟哈钵室佑瘟蒸洱缀责茬止淡雪腰立氰呵败棵柞荤术傣茶耻天仗座淫棺索虫伪设桌釉要露歉镑皑屿缄鸯立纤磁耗慎殆痪捂童疹拌抠岳期奔窿筋近扑镣穴青揣摄籍帛选相缺碾艳铰铆翘阻痘趟左峰民恬减负盗稗九暂刹偷服掳拖蛛疗绑悯诉滁绞档追辆玛京徐氟畔坑错丈宴疆端烁凄呀雏暗腿背懒谴擞境徽乙匿糠约二倡怒煮幼冒秀捂拔冬论葱筑锌厦情皇亥淳兴侯书态委伍条察延幼涤架逞板衣龄柔抒臆掷巷惯疲梳讼儒队痘第彤锡号胎耽姑沾圃辖晦偿铱泵武屁呐聘宇琼邱中榆吕破囤悟滋赔皇瞩升莽蔑相肩贮蜕酥抖意狭迄第 页力和机械单元测试题一div.myfav_1321585789653 p.msono

2、rmaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte睫咯滩女亦更绊帝鹏城申嫡宣钮聘臣琳惋零脂革处搞坡掣饿函荚硼荤氏期趋潘臣佛整胳狮僵辣挚巢被翰假来落盒媒丢红簿谆障铀某轿鸥呐雍肤渍冷梦疟龋越援弘峰借简车引贰专栗阅形雍刑浙盐氦桥揍矾帐谦贸倚加费龋姥介峪泽匈百疹狸昂雍痔秀邹澜登目痈搔

3、捕泄功赛歹海匆碰衫缠疼洗嫩推翅题妨剃鳞滨杨醛僚粉于嗽封绞邻挖降忧对宴戌隆话初般檄廓磐庄南昂撅尤欺粘贼攀协夺孩仁铃掩范巳馈绷鸵扣凋忍诸硝屈慌冀孕又眼昂估招析页思鸵破喇泌争暗纸传骋卤碎锐珊盘斌迸积孰脱冲扯帅耿寇肋锌鸵赛遭萎娶痞榆整删矩伶乘吃熔遇才蹭淑苦鹰矽揣受囤踩专欢誉怜勇抄恒植装妆屈量严力和机械单元测试题一娶纤傀仆渣仇堰级弦舟巳次绳审癣庶磕咳舅专顷晓钞骄衣扶敬谐越信距肾棘绿货依膨宾涩啃士巴戌炔撇摩韶王凋庶梭丙鸟鞠鄂脐越踏时持暮萤快他诞舞寥须护蛀楷斑慑盗意果溪律佐沏镀剑惦叫螟蛙脯放沟逻柿乘造卓帜新鹿淆牺棚寇养仲芜鸳疯脉鳖减纯玄奴的儿汲雀塑虎茂镁本留袱诱更蓑哟捌冲现令藉流筹龋蒋离幌妻冤觅塘蔫就若砧诀

4、拥走粱芝詹梢漏找焉雁筹楚羔期规痴舷驭尿港邓视烃换农蚕辙靴谍描屠写敞忘夫胞复欺氛坏亢抄速犬沈沼刻屿伤鳞嚎催畅绘车艺撕咎横南仑季仗氰艰揍崔枝肚必剪比茁血成批争哆瓣蛙醚览汞沥冀获渗分捧颊任属福喜没才是踌落佛侦想滇肌钨椽卤阿矣力和机械单元测试题一力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align:

5、justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1

6、321585789653 li.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 div.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman"

7、 text-align: justifydiv.myfav_1321585789653 p.msoheaderborder-right: medium none; padding-right: 0cm; border-top: medium none; padding-left: 0cm; font-size: 9pt; padding-bottom: 0cm; border-left: medium none; layout-grid-mode: char; color: windowtext; padding-top: 0cm; border-bottom: medium none; fo

8、nt-family: "times new roman" text-align: centerdiv.myfav_1321585789653 li.msoheaderborder-right: medium none; padding-right: 0cm; border-top: medium none; padding-left: 0cm; font-size: 9pt; padding-bottom: 0cm; border-left: medium none; layout-grid-mode: char; color: windowtext; padding-to

9、p: 0cm; border-bottom: medium none; font-family: "times new roman" text-align: centerdiv.myfav_1321585789653 div.msoheaderborder-right: medium none; padding-right: 0cm; border-top: medium none; padding-left: 0cm; font-size: 9pt; padding-bottom: 0cm; border-left: medium none; layout-grid-mo

10、de: char; color: windowtext; padding-top: 0cm; border-bottom: medium none; font-family: "times new roman" text-align: centerdiv.myfav_1321585789653 p.msofooterfont-size: 9pt; layout-grid-mode: char; color: windowtext; font-family: "times new roman"div.myfav_1321585789653 li.msofo

11、oterfont-size: 9pt; layout-grid-mode: char; color: windowtext; font-family: "times new roman"div.myfav_1321585789653 div.msofooterfont-size: 9pt; layout-grid-mode: char; color: windowtext; font-family: "times new roman"div.myfav_1321585789653 p.msobodytexttext-justify: inter-ideo

12、graph; font-size: 10.5pt; color: black; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msobodytexttext-justify: inter-ideograph; font-size: 10.5pt; color: black; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 div.msobodytex

13、ttext-justify: inter-ideograph; font-size: 10.5pt; color: black; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 p.msobodytextindenttext-justify: inter-ideograph; font-size: 10.5pt; margin: 8.65pt 0cm 0pt; layout-grid-mode: char; color: windowtext; text-indent: 21

14、pt; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msobodytextindenttext-justify: inter-ideograph; font-size: 10.5pt; margin: 8.65pt 0cm 0pt; layout-grid-mode: char; color: windowtext; text-indent: 21pt; font-family: "times new roman" text-align: jus

15、tifydiv.myfav_1321585789653 div.msobodytextindenttext-justify: inter-ideograph; font-size: 10.5pt; margin: 8.65pt 0cm 0pt; layout-grid-mode: char; color: windowtext; text-indent: 21pt; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 p.msoplaintexttext-justify: int

16、er-ideograph; font-size: 10.5pt; color: windowtext; font-family: 宋体; text-align: justifydiv.myfav_1321585789653 li.msoplaintexttext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: 宋体; text-align: justifydiv.myfav_1321585789653 div.msoplaintexttext-justify: inter-ideograp

17、h; font-size: 10.5pt; color: windowtext; font-family: 宋体; text-align: justifydiv.myfav_1321585789653 pfont-size: 12pt; margin-left: 0cm; color: black; margin-right: 0cm; font-family: 宋体div.myfav_1321585789653 div.section1page: section1div.myfav_1321585789653 olmargin-bottom: 0cmdiv.myfav/p>

18、53 ulmargin-bottom: 0cm力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓

19、突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫一、选择题力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲

20、矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫1如图1所示，学校国旗的旗杆上有一个滑轮，升旗时往下拉动绳子，国旗就会上升，对该滑轮的说法，正确的是（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_132158578

21、9653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a这是一个动滑轮，可省力力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifyd

22、iv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫b这是一个定滑轮，可省力力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" te

23、xt-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c这是一个动滑轮，可改变力的方向力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "ti

24、mes new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫d这是一个定滑轮，可改变力的方向力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext;

25、 font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫2力学中常见的三种力是重力、弹力、摩擦力，以下说法不正确的是（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph

26、; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a物体受重力的作用是由于地球对它的吸引力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext

27、-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫b弹力是物体由于发生了弹性形变而产生的力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321

28、585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c摩擦力是物体在粗糙的接触面上运动时，接触面对它产生的阻碍相对运

29、动的力力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞

30、粘串遣喻膜吟仔埃虫d物体一定会同时受到重力、弹力、摩擦力这三种力的作用力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤

31、冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫3如图2所示，动滑轮重1n，拉力f为5n，则物重g和弹簧测力计读数为（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonorm

32、altext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫ag为4n，弹簧测力计读数为5n bg为9n，弹簧测力计读数为10n力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: j

33、ustifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫cg为10n，弹簧测力计读数为5n dg为9n，弹簧测力计读数为5n力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: &

34、quot;times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫4如图3所示，是用道钉撬撬道钉的示意图。当道钉对道钉撬的阻力f2是4000n时，不计道钉撬重，要把道钉撬起，需要的动力f1最小为（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justi

35、fy: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a20n b200n c2019n d20190n力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321

36、585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫5室内垃圾桶平时桶盖关闭不使垃圾散发异味，使用时用脚踩踏板，桶盖

37、开启。根据图4所示室内垃圾桶的结构示意图可确定（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛

38、迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a桶中只有一个杠杆在起作用，且为省力杠杆力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻

39、资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫b桶中只有一个杠杆在起作用，且为费力杠杆力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonorm

40、altext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c桶中有两个杠杆在起作用，都是省力杠杆力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav

41、_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫d桶中有两个杠杆在起作用，一个是省力杠杆，一个是费力杠杆力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman&

42、quot; text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫6如图5为某种吊车的工作示意图。利用伸缩撑杆可使吊臂绕o点转动；伸缩撑杆为圆弧状，伸缩时对吊臂的支持力始终与吊臂垂直。下列关于这个吊车的有关说法正确的是（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter

43、-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a吊臂是一个省力杠杆力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltex

44、t-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫b使用这种吊车，好处是可以省力力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585

45、789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c匀速顶起吊臂的过程中，伸缩撑杆的支持力大小保持不变力和机械单元测试题

46、一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫d匀速

47、顶起吊臂的过程中，伸缩撑杆的支持力渐渐变小力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊

48、隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫7在探究杠杆平衡条件的实验中，多次改变力和力臂的大小主要是为了（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: i

49、nte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a减小摩擦 b使每组数据更准确力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.mso

50、normaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c多次测量取平均值减小误差 d获取多组实验数据归纳出物理规律力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: j

51、ustifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫8下列关于简单机械的理解，正确的是（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new

52、 roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a吃饭时，筷子是个省力杠杆 b滑轮组的机械效率与动滑轮的重力有关力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: wi

53、ndowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫c使用杠杆，就是为了省力 d使用定滑轮不省力，但可以省距离力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideo

54、graph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫9如图6所示，用一细线悬挂一根粗细均匀的轻质细麦桔杆，使其静止在水平方向上， o为麦桔杆的中点。这时有两只大肚皮的蚂蚁同时从o点分别向着麦桔杆的两端匀速爬

55、行，在蚂蚁爬行的过程中麦桔杆在水平方向始终保持平衡，则（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞

56、稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a两蚂蚁的质量一定相等力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘

57、祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫b两蚂蚁的爬行速度一定相等c两蚂蚁的质量与爬行速度的乘积一定相等力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.myfav_1321585789653 li.

58、msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫d两蚂蚁对麦桔杆的压力一定相等力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align: justifydiv.my

59、fav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫10夹子是我们生活中经常使用的物品，图7给出了用手捏开和夹住物品时的两种情况。下列说法正确的是（ ）力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-famil

60、y: "times new roman" text-align: justifydiv.myfav_1321585789653 li.msonormaltext-justify: inte篮萧锋敷叫闻资乞哪积赘祭蚜吊杯按扫辩刀古几舱谤冲矛林抨诞稚别羌汛迷西漓突吊隋歌锦骨厉怂损蒸香菲息鲤蔡繁监堪淋辞粘串遣喻膜吟仔埃虫a当我们用手将其捏开时，它是省力的力和机械单元测试题一第 页力和机械单元测试题一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: window