Block A in the figure(Figure 1) is heavier than block B and is sliding down the incline. All surfaces have friction. The rope is massless, and the massless pulley turns on frictionless bearings. The rope and the pulley are among the interacting objects, but you'll have to decide if they're part of the system.
Part A: Draw a free-body diagram for the block A. (both direction and relative magnitude matter)
Part B: Draw a free-body diagram for the block B. (both direction and relative magnitude matter)