在光滑的地面上放着用绳子连接的物体A、B和C,力F作用在C上(如图2).

问题描述:

在光滑的地面上放着用绳子连接的物体A、B和C,力F作用在C上(如图2).
问那一对是平衡力?哪一对相互作用力?
(1)、A对B的拉力和B对C的拉力.
(2)、B对A的拉力和A对B的拉力.
(3)、A对B的拉力和C对B的拉力.
(4)、B对C的拉力和C对B的拉力.
1个回答 分类:英语 2014-09-24

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