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力臂指的是從支點到力的作用線的垂線的長度, 如果杠杆不在水准位置平衡,由於掛的鉤碼或物體給杠杆施加的力的作用線是豎直的,那麼力臂就不在杠杆上,而在空中,我們就很準確難測出力臂長度. 所以使杠杆在水准位置平衡的目的是:使力臂沿著杠杆,便於量測力臂長度
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