Alex is asked to move two boxes of books in contact with each other and resting

Question

Alex is asked to move two boxes of books in contact with each other and resting on a rough floor. He decides to move them at the same time by pushing on box A with a horizontal pushing forceFP=8.7N.Here A has a massmA=11.0kgand B has a massmB= 7.0 kg.The contact force between the two boxes is

The coefficient of kinetic friction between the boxes and the floor is0.02. (Assume

acts in the +xdirection.)

Alex is asked to move two boxes of books in contact with each other and resting on a rough floor. He decides to move them at the same time by pushing on box A with a horizontal pushing forceFP=8.7N.Here A has a massmA=11.0kgand B has a massmB= 7.0 kg.The contact force between the two boxes is The coefficient of kinetic friction between the boxes and the floor is0.02. What is the magnitude of the acceleration of the two boxes? What is the force exerted onmBbymA? In other words what is the magnitude of the contact force If Alex were to push from the other side on the 7.0-kg box, what would the new magnitude of be?

Explanation / Answer

a) F - f = ma

8.7 - 0.02(11 + 7)g   = (11 + 7)a

a = 0.287 m/s2

b) Fc - f = mBa

Fc - 0.02 x 7 x 9.8 = 7 x 0.287

Fc = 3.38 N

c) den ,

Fc - f = mAa

Fc - 0.02 x 11 x 9.8 = 11 x 0.287

Fc = 5.31 N

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