摘要:A.f1 = 0 .f2 = 2mg ,F1 = 0 .F2 = 2mg B.f1 = mg .f2 = mg ,F1 = 0 .F2 = 2mg C.f1 = 0 .f2 = 2mg ,F1 = mg .F2 = mg D.f1 = 2mg .f2 = mg ,F1 = mg .F2 = mg
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物体A1和A2,B1和B2质量均为m,A1、A2用刚性轻杆相连,B1、B2用轻质弹簧连结,两个装置都竖直放在水平支托物上,处于平衡状态,如图所示。今突然迅速地撤去支托物,让物块下落,在撤去支托物的瞬间,A1、A2受到的合力分别为f1和f2,B1、B2受到合力分别为F1和F2,则
A.f1 = 0 ,f2 = 2mg ;F1 = 0 ,F2 = 2mg
B.f1 = mg ,f2 = mg ;F1 = 0 ,F2 = 2mg
C.f1 = 0 ,f2 = 2mg ;F1 = mg ,F2 = mg
D.f1 = 2mg ,f2 = mg ;F1 = mg ,F2 = mg
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