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科目: 来源:2013届江苏省扬州市江都区麾村中学九年级第一次月考物理试卷(带解析) 题型:单选题

如图所示,我们在拖动行李箱时一般先拉出行李箱上方的拉杆,这样做的目的是为了

A.减小阻力臂,省力B.增大阻力臂,省力
C.减小动力臂,省力D.增大动力臂,省力

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科目: 来源:2013届江苏省扬州市江都区麾村中学九年级第一次月考物理试卷(带解析) 题型:单选题

下列测量工具没有利用杠杆原理的是(  )

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科目: 来源:2013届江苏省扬州市江都区麾村中学九年级第一次月考物理试卷(带解析) 题型:单选题

下列工具在正常使用的过程中,可以看作费力杠杆的是

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科目: 来源:2013届江苏省泰州市永安初级中学九年级12月练习物理试卷(带解析) 题型:单选题

如图所示,杠杆处于平衡状态,则F的力臂是
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

A.OAB.OCC.ODD.FD

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科目: 来源:2013届江苏省泰州市永安初级中学九年级12月练习物理试卷(带解析) 题型:单选题

使用滑轮组肯定不能做到的是

A.既省力又改变力的方向
B.既省力又省距离
C.省力但不能改变力的方向
D.不省力但可以改变力的方向

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科目: 来源:2013届江苏省启东市东海中学九年级上学期期中考试物理试卷(带解析) 题型:单选题

4、如图所示,甲、乙、丙三个相同的杠杆,所挂的物体受到的重力均为G,它们分别在方向如图所示的力F1、F2、F3作用下处于平衡状态,那么

A.F1=F2=F3 B.F1<F2<F3C.F1>F2>F3 D.F2>F3>F1

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科目: 来源:2013届江苏省启东市东海中学九年级上学期期中考试物理试卷(带解析) 题型:单选题

如图所示,起瓶器开启瓶盖时,可看作是

A.以B为支点的费力杠杆B.以B为支点的省力杠杆
C.以A为支点的费力杠杆D.以A为支点的省力杠杆

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科目: 来源:2013届江苏省泰州市永安初级中学九年级上期中考试物理试卷(带解析) 题型:单选题

“给我一个支点和一根足够长的棍,我就能撬起整个地球.”下列生产和生活中的杠杆与阿基米德设想的杠杆属于同一类型的是

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科目: 来源:2013届湖北省鄂州市第三中学九年级上学期期中考试物理试卷(带解析) 题型:单选题

如图所示,弹簧测力计A、B和滑轮组组成的装置中,若拉绳的力为F,则两弹簧测力计的示数为(     )   

A.F A="F" B = F         B.F A=3F   F B ="2" F
C.F A= 2F  F B =3F    D.F A="F" B=3F/2

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科目: 来源:2013届湖北省鄂州市第三中学九年级上学期期中考试物理试卷(带解析) 题型:单选题

如图所示,在竖直向上大小为10N的力F的作用下,重物A沿竖直方向匀速上升。已知重物A上升速度为0.2 m/s,不计滑轮重、绳重及绳与滑轮间的摩擦,则物体的重力大小和滑轮上升的速度分别为(    )

A.20N 0.4m/sB.20N 0.1 m/s
C.5 N 0.4m/sD.5N 0.1 m/s

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