Two books are stacked on top of a table, book A resting on top of book B. The Fr

Question

Two books are stacked on top of a table, book A resting on top of book B. The Free Body Diagrams of the books are shown above, with the forces labeled by the type of force and a number. Which of the following forces are "force pairs" as described by Newton’s 3rd Law?

Include all answers that are Newton's 3rd pairs for this problem. There may be one or more. You must include all the correct answers for full credit, and will lose points for any incorrect answer. Note that the "+" in the problem is for sums of forces.

FN2 and (FG1 + FG2) are pairs

FG2 and FN3 are pairs

FN2 and (FN3 + FG2) are pairs

FG1 and FG2 are pairs

FN2 and FN3 are pairs

FG1 and FN2 are pairs

(FN1 + FN2) and (FG1 + FN3 + FG2) are pairs

FN1 and FG2 are pairs

FN2 and FG2 are pairs

FG1 and FN3 are pairs

FN1 and FN3 are pairs

FN1 and FN2 are pairs

FN1 and FG1 are pairs

THANKS IN ADVANCED I believe its K, but im not sure...

A)

FN2 and (FG1 + FG2) are pairs

B)

FG2 and FN3 are pairs

C)

FN2 and (FN3 + FG2) are pairs

D)

FG1 and FG2 are pairs

E)

FN2 and FN3 are pairs

F)

FG1 and FN2 are pairs

G)

(FN1 + FN2) and (FG1 + FN3 + FG2) are pairs

H)

FN1 and FG2 are pairs

I)

FN2 and FG2 are pairs

J)

FG1 and FN3 are pairs

K)

FN1 and FN3 are pairs

L)

FN1 and FN2 are pairs

M)

FN1 and FG1 are pairs

Explanation / Answer

Yes, you are right.
K is the answer.
Since, here are we considering two bodies in contacr with each other, hence, the force acting between them is the normal contact force.
Here, we have FN1 and FN3 are those two normal contact forces.

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