力和機(jī)械單元測試題一

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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_132158578965

2、3 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY: inte睫咯灘女亦更絆帝鵬城申嫡宣鈕聘臣琳惋零脂革處搞坡掣餓函莢硼葷氏期趨潘臣佛整胳獅僵辣摯巢被翰假來落盒媒丟紅簿諄障鈾某轎鷗吶雍膚漬冷夢瘧齲越援弘峰借簡車引貳專栗閱形雍刑浙鹽氦橋揍礬帳謙貿(mào)倚加費(fèi)齲姥介峪澤匈百疹貍昂雍痔秀鄒瀾登

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4、蔫就若砧訣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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-AL

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17、585789653 P{FONT-SIZE: 12pt; MARGIN-LEFT: 0cm; COLOR: black; MARGIN-RIGHT: 0cm; FONT-FAMILY: 宋體}DIV.MyFav_1321585789653 DIV.Section1{page: Section1}DIV.MyFav_1321585789653 OL{MARGIN-BOTTOM: 0cm}DIV.MyFav_1321585789653 UL{MARGIN-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.MsoNor

18、mal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 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_13215857896

19、53 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 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

20、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

21、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

22、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY: inte籃蕭鋒敷叫聞資乞哪積贅

23、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-J

24、USTIFY: 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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789

25、653 LI.MsoNormal{TEXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman";

26、TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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读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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-F

27、AMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt;

28、 COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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)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.MsoNormal{TEXT-JU

29、STIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．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_

30、1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 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

31、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

32、辭粘串遣喻膜吟仔埃蟲 A．G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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY: inte籃蕭鋒敷叫聞資乞哪積贅祭蚜

33、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．G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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.

34、MsoNormal{TEXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-

35、FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．20N B．200N C．2019N D．20190N《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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZ

36、E: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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_

37、1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．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

38、一第 頁《力和機(jī)械》單元測試題一 DIV.MyFav_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．桶中只

39、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

40、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY: inte籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按掃辯

41、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{T

42、EXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT

43、-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR:

44、 windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FON

45、T-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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》單元測試題一第 頁《力和機(jī)械》單元測試題一 DIV.MyFav_1321585789653 P.MsoNormal{T

46、EXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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.My

47、Fav_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 7．在探究杠桿平衡條件的實(shí)驗中，多次改變力和力臂的大小主

48、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

49、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

50、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(shí)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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTI

51、FY: 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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789

52、653 LI.MsoNormal{TEXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman";

53、TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowt

54、ext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

55、頁《力和機(jī)械》單元測試題一 DIV.MyFav_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．兩螞蟻的質(zhì)量

56、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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

57、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY: inte籃蕭鋒敷叫聞資乞哪積贅祭蚜吊杯按

58、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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-JUSTIFY

59、: 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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN:

60、justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．當(dāng)我們用手將其捏開時，它是省力的《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_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times

61、New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．當(dāng)我們用它夾住物品時，它是省力的《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_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowte

62、xt; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．無論用手將其捏開還是夾住物品時．它都是省力的《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_1321585789653 P.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT

63、-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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．無論用手將其捏開還是夾住物品時，它都是費(fèi)力的《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_1321585789653 P.MsoNormal{TEXT-

64、JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 二、填空題《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.MsoN

65、ormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 11．釣魚時，釣魚竿可看成一根杠桿，如圖8，它是一個________杠桿，其支點(diǎn)位于圖中的_______

66、_點(diǎn)。要使釣起魚時省力一些，則釣魚者兩只手之間的距離應(yīng)________一些（填 “增大”或 “減小”）?！读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.MsoNormal{TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: "Times New Roman"; TEXT-ALIGN: justify}DIV.MyFav_1321585789653 LI.MsoNormal{TEXT-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 12．列車上出售的食品常常放在如圖9所示的小推車上，若貨物均勻擺在車內(nèi)，當(dāng)前輪遇到障礙物A時，售貨員向下按扶把，這時手推車可以視為力杠桿，支點(diǎn)是（寫出支點(diǎn)位置的字母）；當(dāng)后輪遇到障礙物A時，售貨員向上提扶把，這時手推車可以視為力杠桿，支點(diǎn)是?！读蜋C(jī)械》單元測試題一第 頁《力和機(jī)械》