The maximum velocity reached by a falling object when the resistance of the medium equals the force due to gravity is called terminal velocity.

Here's why:

* Force of gravity: As an object falls, gravity pulls it downwards, causing it to accelerate.

* Air resistance: As the object falls faster, the air resistance (or drag) acting on it increases. This resistance opposes the motion of the object.

* Terminal velocity: When the force of air resistance equals the force of gravity, the net force acting on the object becomes zero. This means the object stops accelerating and reaches a constant velocity, known as terminal velocity.

Key points about terminal velocity:

* It depends on the object's shape, mass, and the density of the medium it's falling through (usually air).

* Objects with larger surface areas experience more air resistance and reach lower terminal velocities.

* Heavier objects have a greater force of gravity acting on them, but they also encounter more air resistance, so the difference in terminal velocity is not always significant.

Let me know if you'd like to explore the physics behind terminal velocity in more detail!