Here's why:
* Force of Gravity: This pulls the object downwards, causing it to accelerate.
* Drag Force: This is the resistance the air provides to the object's motion. It increases as the object's speed increases.
When the two forces become equal, the net force acting on the object becomes zero. This means:
* No further acceleration: The object will continue falling at a constant speed. This constant speed is called terminal velocity.
Think of it like this: Imagine you're skydiving. As you fall faster, the air resistance increases. Eventually, the air resistance becomes strong enough to counteract gravity, and you stop accelerating. You've reached terminal velocity!