I was receiving help for the following problem... The 2.0 kg wood box in the figureslides down a vertical wood wall while you push on it at a 45 ∘ angle. The coefficient of kinetic friction of wood on wood is μk = 0.200. What magnitude of force should you apply to cause the box to slide down at a constant speed? And I was told to set the F(net) of the y-axis to 0 because the box is in dynamic equilibrium. What exactly does dynamic equilibrium mean? I want to understand so I'll know to use it in a different problem.