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|dw:1356948181967:dw|

|dw:1356949501640:dw|
is that right ?

sorry.. this is right! missed the pseudo on second small block..

This problem was already solved on OS. Will try to find the reference.

|dw:1356961990631:dw|

Sorry that case was when it tends to move to the right

Now, |dw:1356962249332:dw|

Fr1= umg
Fr2 =umF/(M+2m)

F' = mF/(M+2m)
W=mg

From W-Fr2-F'-Fr1=0 we get F=g(M+2m)(1+u)(1-u)
From F'-mg-Fr2-Fr1=0 we get F =g(M+2m)(1+u)/(1-u)

i see!!
thanks a lot!
that helped !

i understand it now..