Here's why:
* Air resistance: As an object falls, it experiences air resistance, a force that opposes its motion. The faster the object falls, the greater the air resistance.
* Balance: Eventually, the force of air resistance becomes equal to the force of gravity pulling the object down. At this point, the object stops accelerating and reaches a constant speed. This speed is its terminal velocity.
Factors affecting terminal velocity:
* Object shape: A streamlined object will have a lower terminal velocity than a less aerodynamic object.
* Object mass: A heavier object will have a higher terminal velocity than a lighter object of the same shape.
* Air density: The denser the air, the lower the terminal velocity.
Example:
A skydiver with their parachute open has a much lower terminal velocity than a skydiver in freefall. This is because the parachute increases the surface area and air resistance, slowing the descent.
Important Note:
* The terminal velocity of an object is not a fixed value, but depends on the factors mentioned above.
* In a vacuum, where there is no air resistance, an object would continue to accelerate indefinitely, reaching extremely high speeds.
Let me know if you have any other questions!
