1. The problem statement, all variables and given/known data The coefficient of friction between A and the table is μA. The coefficient of friction between A and B is μB. A, B, C and D all move with an acceleration of 2m/s^2 (A and B move to the left). Find the force that the friction between the bodies apply on B. Find the tension of the yarn that connects A and C. Find the mass of D. At a certain moment, the yarn which connects A and D is torn. Will A and B still move together? (Show with calculations) mA=1.4kg ,mB=0.6kg, mC=2kg, μA=0.2, μB=0.75, a=2m/s^2 *Both times the static and dynamic coefficients are equal. 2. Relevant equations F=ma 3. The attempt at a solution The last question is what I am stuck in, but I don't have the answers so I will show my calculations prior to that. Forces on A and B: (I hope everything is clear) mBg=6N so NB=6N, now we could see that according to ma=F, 1.2=F, so the force is 1.2N. Now if we look at C we could see that 4=TC-20, TC=24N. Now if we look at A we could see that: mAg=14N, so NA=20N. Using ma=F: 2.8=TD-1.2-24-0.2*20 so 2.8=TD-29.2, TD=32N Looking at D: 2mD=10mD-TD, mD=4kg. Now I am not sure what to do, I tried to draw the forces again, but from there I don't really know what to do. How can I know if C moves now? If it doesn't then A and B doesn't move, but if it does I don't know how to reach the answer. Thanks in advance!