Concept behind Three Block Friction Problem with Applied Forces?

[physixguru]

>>>"Friction Problem"<<<

Homework Statement

need some help...

three blocks of masses 2kg ..3kg and 7kg are kept one above the other.
coeff of friction between 2kg and 3 kg =0.2
coeff of friction between 3kg and 7kg=0.3
surface between 7kg block and ground=frictionless.

calculate accln of each block if a force equal to 10 N is applied to the 2kg block ..3kg block and 7kg block each in three different cases.

Homework Equations

N/A

The Attempt at a Solution

i have done the work...just wanted to know the concept behind it..

 

[Doc Al]

Do you have a specific question about this problem?

 

[physixguru]

Do you have a specific question about this problem?

could not get you frnd...