杠杆难题用答案完全解决
学校教务系统
杠杆难题一、选择题1、如图3所示，在调节好平衡杆的左侧，在距离支点40 cm处挂上总重3 N的挂钩线，在距离右侧支点30cm处用弹簧计卡住，将杆的右端向不同方向拉动，使杆水平平衡。
职教二十条
2、如右图所示，古人在树枝上悬挂硬棒(忽略质量)，用绳带对棒的动力F1使棒绕0点旋转提桶。 以下表达正确的是) a。教学质量分析
妨碍棒旋转的阻力是绳对棒(b点)的拉力c。 棒旋转过程中，动力臂始终OA 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