When an object falls with constant speed, it means its acceleration is zero. This means the forces acting on it are balanced. Here's the breakdown:

* Gravity: This force pulls the object downwards.

* Air Resistance (Drag): As the object falls, it encounters air resistance, a force that opposes its motion. This force increases as the object's speed increases.

When the object reaches terminal velocity:

* Gravity and Air Resistance are equal in magnitude and opposite in direction. This balance of forces results in a net force of zero, leading to constant speed (no acceleration).

Key Points:

* Terminal velocity is the maximum speed an object can reach during freefall.

* The shape and size of an object greatly influence its air resistance. A wider, flatter object will experience more air resistance than a streamlined object.

Let me know if you'd like a more detailed explanation of any of these concepts!