A suitcase sits on a stationary airport luggage cart,as in Figure 4-13.Draw a free-bodydiagram for each object and specifically indicate any interaction pairs between the two.

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A suitcase sits on a stationary airport luggage cart,as in Figure 4-13.Draw a free-body
diagram for each object and specifically indicate any interaction pairs between the two.

我不太懂英语,但猜这题应该是要画每个物体的受力分析图,
并且指出相互作用力.
    如图容易看出,N和N’是一对相互作用力.