Activity: Box on Wall Below are six cubes held at rest against a wall. The coefficients of friction between each cube and the wall are identical. (A) (B) 15 kg 19 kg 110 N 120 N (C) (D) 2 kg 3 kg 130 NL 140 N (E) (F) 3 kg 3 kg 120 NL 130 NL (a) Rank the cubes on the basis of the force of the wall acting on them. Largest => 1. 2 . 3. 4 ._ 5. 6.