力和机械单元测试题一

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TEXT-INDENT: 21pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1321585789653 P.MsoPlainTextTEXT-JUSTIFY: inter-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-ideograph; 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_1321585789653 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_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: 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; 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: 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; 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; 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-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_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.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: 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: 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-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_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.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_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; 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-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.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_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: 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.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: 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 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: 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-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.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.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-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: 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当我们用它夹住物品时，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: 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无论用手将其捏开还是夹住物品时它都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: 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无论用手将其捏开还是夹住物品时，它都是费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: 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二、填空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11钓鱼时，钓鱼竿可看成一根杠杆，如图8，它是一个_杠杆，其支点位于图中的_点。要使钓起鱼时省力一些，则钓鱼者两只手之间的距离应_一些（填 “增大”或 “减小”）。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12列车上出售的食品常常放在如图9所示的小推车上，若货物均匀摆在车内，当前轮遇到障碍物A时，售货员向下按扶把，这时手推车可以视为力杠杆，支点是（写出支点位置的字母）；当后轮遇到障碍物A时，售货员向上提扶把，这时手推车可以视为力杠杆，支点是。力和机械单元测试题一第 页力和机械