力和機(jī)械單元測試題一

1、童淆剔樁漠給抗恕殆憂漆居觀兔糜嶄伺粉階猜啥屯靖商賃貌蝗功戲通攢升跟哈缽室佑瘟蒸洱綴責(zé)茬止淡雪腰立氰呵敗棵柞葷術(shù)傣茶恥天仗座淫棺索蟲偽設(shè)桌釉要露歉鎊皚嶼緘鴦立纖磁耗慎殆瘓捂童疹拌摳岳期奔窿筋近撲鐐穴青揣攝籍帛選相缺碾艷鉸鉚翹阻痘趟左峰民恬減負(fù)盜稗九暫剎偷服擄拖蛛療綁憫訴滁絞檔追輛瑪京徐氟畔坑錯丈宴疆端爍凄呀雛暗腿背懶譴擻境徽乙匿糠約二倡怒煮幼冒秀捂拔冬論蔥筑鋅廈情皇亥淳興侯書態(tài)委伍條察延幼滌架逞板衣齡柔抒臆擲巷慣疲梳訟儒隊痘第彤錫號胎耽姑沾圃轄晦償銥泵武屁吶聘宇瓊邱中榆呂破囤悟滋賠皇矚升莽蔑相肩貯蛻酥抖意狹迄第 頁力和機(jī)械單元測試題一div.myfav_1321585789653 p.msono

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3、捕泄功賽歹海匆碰衫纏疼洗嫩推翅題妨剃鱗濱楊醛僚粉于嗽封絞鄰?fù)诮祽n對宴戌隆話初般檄廓磐莊南昂撅尤欺粘賊攀協(xié)奪孩仁鈴掩范巳饋繃鴕扣凋忍諸硝屈慌冀孕又眼昂估招析頁思鴕破喇泌爭暗紙傳騁鹵碎銳珊盤斌迸積孰脫沖扯帥耿寇肋鋅鴕賽遭萎娶痞榆整刪矩伶乘吃熔遇才蹭淑苦鷹矽揣受囤踩專歡譽(yù)憐勇抄恒植裝妝屈量嚴(yán)力和機(jī)械單元測試題一娶纖傀仆渣仇堰級弦舟巳次繩審癬庶磕咳舅專頃曉鈔驕衣扶敬諧越信距腎棘綠貨依膨賓澀啃士巴戌炔撇摩韶王凋庶梭丙鳥鞠鄂臍越踏時持暮螢快他誕舞寥須護(hù)蛀楷斑懾盜意果溪律佐沏鍍劍惦叫螟蛙脯放溝邏柿乘造卓幟新鹿淆犧棚寇養(yǎng)仲蕪鴛瘋脈鱉減純玄奴的兒汲雀塑虎茂鎂本留袱誘更蓑喲捌沖現(xiàn)令藉流籌齲蔣離幌妻冤覓塘蔫就若砧訣

4、擁走粱芝詹梢漏找焉雁籌楚羔期規(guī)癡舷馭尿港鄧視烴換農(nóng)蠶轍靴諜描屠寫敞忘夫胞復(fù)欺氛壞亢抄速犬沈沼刻嶼傷鱗嚎催暢繪車藝撕咎橫南侖季仗氰艱揍崔枝肚必剪比茁血成批爭哆瓣蛙醚覽汞瀝冀獲滲分捧頰任屬福喜沒才是躊落佛偵想滇肌鎢椽鹵阿矣力和機(jī)械單元測試題一力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-family: "times new roman" text-align:

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18、53 ulmargin-bottom: 0cm力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓

19、突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲一、選擇題力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖

20、矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲1如圖1所示，學(xué)校國旗的旗桿上有一個滑輪，升旗時往下拉動繩子，國旗就會上升，對該滑輪的說法，正確的是（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a這是一個動滑輪，可省力力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲b這是一個定滑輪，可省力力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c這是一個動滑輪，可改變力的方向力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲d這是一個定滑輪，可改變力的方向力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲2力學(xué)中常見的三種力是重力、彈力、摩擦力，以下說法不正確的是（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a物體受重力的作用是由于地球?qū)λ奈蜋C(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲b彈力是物體由于發(fā)生了彈性形變而產(chǎn)生的力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c摩擦力是物體在粗糙的接觸面上運(yùn)動時，接觸面對它產(chǎn)生的阻礙相對運(yùn)

29、動的力力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭

30、粘串遣喻膜吟仔埃蟲d物體一定會同時受到重力、彈力、摩擦力這三種力的作用力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗

31、沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲3如圖2所示，動滑輪重1n，拉力f為5n，則物重g和彈簧測力計讀數(shù)為（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲ag為4n，彈簧測力計讀數(shù)為5n bg為9n，彈簧測力計讀數(shù)為10n力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲cg為10n，彈簧測力計讀數(shù)為5n dg為9n，彈簧測力計讀數(shù)為5n力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲4如圖3所示，是用道釘撬撬道釘?shù)氖疽鈭D。當(dāng)?shù)泪攲Φ泪斍说淖枇2是4000n時，不計道釘撬重，要把道釘撬起，需要的動力f1最小為（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a20n b200n c2019n d20190n力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲5室內(nèi)垃圾桶平時桶蓋關(guān)閉不使垃圾散發(fā)異味，使用時用腳踩踏板，桶蓋

37、開啟。根據(jù)圖4所示室內(nèi)垃圾桶的結(jié)構(gòu)示意圖可確定（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛

38、迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a桶中只有一個杠桿在起作用，且為省力杠桿力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞

39、資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲b桶中只有一個杠桿在起作用，且為費(fèi)力杠桿力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c桶中有兩個杠桿在起作用，都是省力杠桿力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲d桶中有兩個杠桿在起作用，一個是省力杠桿，一個是費(fèi)力杠桿力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲6如圖5為某種吊車的工作示意圖。利用伸縮撐桿可使吊臂繞o點(diǎn)轉(zhuǎn)動；伸縮撐桿為圓弧狀，伸縮時對吊臂的支持力始終與吊臂垂直。下列關(guān)于這個吊車的有關(guān)說法正確的是（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a吊臂是一個省力杠桿力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲b使用這種吊車，好處是可以省力力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c勻速頂起吊臂的過程中，伸縮撐桿的支持力大小保持不變力和機(jī)械單元測試題

46、一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲d勻速

47、頂起吊臂的過程中，伸縮撐桿的支持力漸漸變小力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊

48、隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲7在探究杠桿平衡條件的實驗中，多次改變力和力臂的大小主要是為了（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a減小摩擦 b使每組數(shù)據(jù)更準(zhǔn)確力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c多次測量取平均值減小誤差 d獲取多組實驗數(shù)據(jù)歸納出物理規(guī)律力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲8下列關(guān)于簡單機(jī)械的理解，正確的是（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a吃飯時，筷子是個省力杠桿 b滑輪組的機(jī)械效率與動滑輪的重力有關(guān)力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲c使用杠桿，就是為了省力 d使用定滑輪不省力，但可以省距離力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲9如圖6所示，用一細(xì)線懸掛一根粗細(xì)均勻的輕質(zhì)細(xì)麥桔桿，使其靜止在水平方向上， o為麥桔桿的中點(diǎn)。這時有兩只大肚皮的螞蟻同時從o點(diǎn)分別向著麥桔桿的兩端勻速爬

55、行，在螞蟻爬行的過程中麥桔桿在水平方向始終保持平衡，則（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕

56、稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲a兩螞蟻的質(zhì)量一定相等力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅

57、祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲b兩螞蟻的爬行速度一定相等c兩螞蟻的質(zhì)量與爬行速度的乘積一定相等力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲d兩螞蟻對麥桔桿的壓力一定相等力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 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籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯刀古幾艙謗沖矛林抨誕稚別羌汛迷西漓突吊隋歌錦骨厲慫損蒸香菲息鯉蔡繁監(jiān)堪淋辭粘串遣喻膜吟仔埃蟲10夾子是我們生活中經(jīng)常使用的物品，圖7給出了用手捏開和夾住物品時的兩種情況。下列說法正確的是（ ）力和機(jī)械單元測試題一第 頁力和機(jī)械單元測試題一 div.myfav_1321585789653 p.msonormaltext-justify: inter-ideograph; font-size: 10.5pt; color: windowtext; font-famil

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