Tom pushes two identical blocks on a horizontal frictionless table from the left

Question

Tom pushes two identical blocks on a horizontal frictionless table from the left. The force that block 1 exerts on block 2 is F12. The force that block 2 exerts on block 1 is F21.

(1) Compare the magnitude of F12 and F21.

     (A) F12 < F21

     (B) F12 > F21

     (C) F12 = F21

     (D) Cannot be determined

(2) Compare the magnitude of F12 and FLeft.

     (A) F12 > FLeft

     (B) F12 < FLeft

     (C) F12 = FLeft

     (D) Cannot be determined

Tom pushes two identical blocks on a horizontal frictionless table from the left. The force that block 1 exerts on block 2 is F12. The force that block 2 exerts on block 1 is F21. (1) Compare the magnitude of F12 and F21. (2) Compare the magnitude of F12 and FLeft.

Explanation / Answer

(C)F12 = F21 (Since the two blocks are identical)

(B) F12 < FLeft (Since F12=F21=Fm = F*m/(m+m) = F/2 )

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