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## Homework Statement

__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.

## Homework Equations

[tex]\sum F = ma[/tex]

## The Attempt at a Solution

Body (A):

http://img266.imageshack.us/img266/2518/78564322dp4.png [Broken]

N - W

_{2}= 0

N = W

_{2}

F

_{k}- P = 0

F

_{k}= P

*u*× N = P

_{k}0.25 × 3.6 = P

P = 0.9 N.

Body (B):

http://img440.imageshack.us/img440/6740/35855205ln7.png [Broken]

P + F

_{k}= F

F =

*u*N + P

_{k}F = [ 0.25 × (3.6+5.4) ] + 0.9

F = (9 × 0.25) + 0.9

F = 3.15 N.

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