Three identical boxes of equal mass( M1=5kg M2=5kg M3=5kg) are pushed to the rig

Question

Three identical boxes of equal mass( M1=5kg M2=5kg M3=5kg) are pushed to the right across a flat surface by a horizontal force Fa with a magnitude of 50N. As shown in the figure, box 2 sits to the right of box 1 and box 3 sits on top of box 1. The surface is frictionless.

1) What is the magnitude of the force which box 1 exerts on box 2?

a) 17 N

b) 25 N

c) 3.3 N

d) 10 N

e) 33 N

2) The Newton's Third Law pair to the force exerted by box 1 on box 3 points in which direction?

a) Up and to the left

b) Up and to the right

c) Down and to the left

d) Down and to the right

Explanation / Answer

1)

F = (50/15)*5 = 50/3 = 16.66667 17 N

a) 17 N

2)

b) Up and to the right

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