You're absolutely right! When the air resistance force acting on a falling object equals its weight, the object has reached terminal velocity.

Here's why:

* Free Fall: An object in free fall experiences only the force of gravity, pulling it downwards.

* Air Resistance: As an object falls through the air, it encounters resistance from the air molecules. This force increases as the object's speed increases.

* Terminal Velocity: When the air resistance force becomes equal in magnitude to the force of gravity (the object's weight), the forces balance out. The object stops accelerating and falls at a constant speed called terminal velocity.

Important Note: Terminal velocity is not a fixed value for a given object. It depends on factors like:

* Object's shape: A more streamlined object experiences less air resistance.

* Object's mass: A heavier object has a greater force of gravity acting on it, leading to a higher terminal velocity.

* Air density: Terminal velocity is lower in thinner air (like at high altitudes).

Let me know if you have any more questions about free fall or terminal velocity!