1. The problem statement, all variables and given/known data Given data: - The weight of (A) is 3.6 N. - The weight of (B) is 5.4 N. - The kinetic friction coefficient between all surfaces is 0.25 http://img369.imageshack.us/img369/2999/figurehg3.png [Broken] The problem statement: Find the required force for dragging (B) with a constant speed. 2. Relevant equations [tex]\sum F = ma[/tex] 3. The attempt at a solution Body (A): http://img266.imageshack.us/img266/2518/78564322dp4.png [Broken] N - W2 = 0 N = W2 Fk - P = 0 Fk = P uk × N = P 0.25 × 3.6 = P P = 0.9 N. Body (B): http://img440.imageshack.us/img440/6740/35855205ln7.png [Broken] P + Fk = F F = ukN + P F = [ 0.25 × (3.6+5.4) ] + 0.9 F = (9 × 0.25) + 0.9 F = 3.15 N.