* Drag force increases with speed: The drag force acting on an object moving through a fluid is proportional to the square of its velocity. So, as the object falls and accelerates, the drag force increases.

* Weight remains constant: The object's weight, which is the force due to gravity, remains constant throughout the fall.

* Terminal velocity: Terminal velocity is reached when the drag force becomes equal to the object's weight. At this point, the net force on the object is zero, and it stops accelerating.

Before terminal velocity:

* The object is accelerating downwards.

* The drag force is less than the object's weight.

* This means there's a net force downwards, causing the object to accelerate.

At terminal velocity:

* The object is no longer accelerating.

* The drag force is equal to the object's weight.

* There's no net force acting on the object.

Think of it this way:

Imagine you're holding a heavy ball. You let go, and it falls. At first, the only force acting on it is gravity (its weight). As it picks up speed, the air resistance (drag) starts to oppose its motion. Eventually, the air resistance becomes strong enough to balance out the force of gravity, and the ball stops accelerating – it's reached terminal velocity.