Here's a breakdown:
* Gravity: Pulls an object downwards, constantly accelerating it.
* Air Resistance: A force that opposes an object's motion through the air. As an object falls faster, the air resistance increases.
The Key Point: As an object falls, its speed increases, which in turn increases air resistance. At some point, the air resistance force becomes equal and opposite to the force of gravity.
At Terminal Velocity:
* The object is no longer accelerating.
* The forces of gravity and air resistance are balanced.
* The object falls at a constant speed.
Factors Affecting Terminal Velocity:
* Mass: A heavier object experiences a stronger gravitational force, leading to a higher terminal velocity.
* Shape: A streamlined object experiences less air resistance and therefore has a higher terminal velocity than a less aerodynamic object.
* Surface Area: A larger surface area exposed to air increases air resistance, leading to a lower terminal velocity.
* Density of Air: Denser air creates more resistance, leading to a lower terminal velocity.
Examples:
* A skydiver reaches a terminal velocity of around 120 mph (190 km/h) in a freefall position.
* A feather, with its large surface area and low mass, has a much lower terminal velocity than a rock.
In conclusion, terminal velocity is the result of a balance between gravity and air resistance, ensuring that an object falling through the air eventually reaches a constant speed.
