Here's what happens:
* Gravity pulls the object down. The force of gravity is constant, pulling the object towards the Earth's center.
* Air resistance opposes the motion. As the object falls, it encounters air resistance, which increases with speed. This force acts upwards, opposing the downward motion.
* Forces balance. At a certain speed, the force of gravity pulling the object down becomes equal to the air resistance pushing it up. This is terminal velocity.
* Constant speed. Once terminal velocity is reached, the object continues falling at a constant speed. It no longer accelerates, as the forces are balanced.
Important points:
* Terminal velocity varies. It depends on factors like the object's shape, size, and mass, as well as the density of the air.
* Not a sudden event. Terminal velocity is not reached instantly. The object gradually accelerates until the forces balance.
Think of it like this: Imagine a skydiver. When they jump out of a plane, they accelerate downwards. As they fall faster, air resistance increases, eventually balancing the force of gravity. At this point, the skydiver reaches terminal velocity and falls at a constant speed until they deploy their parachute.
