What is dynamic equilibrium in laymen's terms?

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Dynamic equilibrium refers to a state where an object is moving at a constant speed without any acceleration, meaning the net force acting on it is zero. In the context of the wood box sliding down the wall, this implies that the forces acting on the box in both the vertical and horizontal directions balance out. To achieve this, the applied force must counteract the force of gravity and friction. Understanding dynamic equilibrium is crucial for solving similar physics problems, as it allows for the correct application of force calculations. The concept emphasizes that even in motion, if the net force is zero, the object maintains a steady velocity.
meglynj
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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.
 
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Dynamic equilibrium means no accelerations, even though the box is moving.

The sum of the forces in each direction should be zero.
 
comparing a flat solar panel of area 2π r² and a hemisphere of the same area, the hemispherical solar panel would only occupy the area π r² of while the flat panel would occupy an entire 2π r² of land. wouldn't the hemispherical version have the same area of panel exposed to the sun, occupy less land space and can therefore increase the number of panels one land can have fitted? this would increase the power output proportionally as well. when I searched it up I wasn't satisfied with...

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