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一、选择题（选择一个正确答案，共15题，每题2分，计30分）
1．如图1，下图中可视为费力杠杆的是 （ ）
A B 图1 C D
2．如图2所示是自卸车的示意图，车厢部分可视为杠杆，则下列分析正确的是（ ）
图2
A．B点是支点，液压杆施加的力是动力，货物重力是阻力
B．B点是支点，物体A放在车厢前部可省力
C．C点是支点，物体A放在车厢后部可省力
D．C点是支点，物体A放在车厢前部可省力
3．一根轻质杠杆，在左右两端分别挂在200牛和300牛的重物时，杠杆恰好平衡。若将两边物重同时减少50牛，则杠杆（? ）
A．左端下沉
B．右端下沉
C．仍然平衡
D．无法确定
4．如图3所示，杠杆上分别放着质量不相等的两个球，杠杆在水平位置平衡，如果两球以相同的水平移动速度同时匀速向支点移动一点距离，则杠杆（? ）
A．仍能平衡
B．不能平衡，大球那端下沉
C．不能平衡，小球那端下沉
D．无法判断
5．如图4示，人的前臂可视为杠杆，当将茶杯沿箭头方向举起时，下列说法正确的是（ ）
A．前臂是省力杠杆，阻力臂变大
B．前臂是省力杠杆，阻力臂变小
C．前臂是费力杠杆，阻力臂变大
D．前臂是费力杠杆，阻力臂变小
图3 图4 图5 图6 图7
6．如图5所示，林雨将两只鸡蛋举高1米，所做的功最接近于（ ）
A．0．01J
B．0．1J
C．1J
D．10J
7．如图6所示的轻质杠杆，AO小于BO，在A、B两端悬挂重物G1和G2后杠杆平衡。若将G1和G2同时向支点O移动相同的距离，则（ ）
A．杠杆仍保持平衡
B．杠杆的A端向下倾斜
C．杠杆的B端向下倾斜
D．无法判断
8．如图7所示，AOB为一杠杆（自重不计），O为支点（OA”、“
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