1. The problem statement, all variables and given/known data The mass of block A is 42kg, and the mass of block of B is 50kg. The surfaces are smooth. If the blocks are in equilibrium, what is the force F? 2. Relevant equations [tex]\sum[/tex]Fx=0 [tex]\sum[/tex]Fy=0 3. The attempt at a solution I added the vectors do this diagram. The normal force to both blocks, the weight of each box. I treated the two boxes as one whole so I wouldn't have to worry about their contact area. I got this for my equations: [tex]\sum[/tex]Fx= NA*cos(70) + F - NB=0 [tex]\sum[/tex]Fy= NA*sin(70) - 42*9.81-50*9.81=0 I can solve for Na, but I can't ge to F. Help?