Forces at Play:
* Gravity: This is the force pulling the object downwards, causing it to accelerate.
* Air Resistance (Drag): As an object falls through the air, it encounters resistance from the air molecules. This force opposes the motion and increases with the object's speed.
The Process:
1. Initial Acceleration: When an object begins to fall, gravity is the dominant force, causing it to accelerate downwards. The object's speed increases.
2. Increasing Air Resistance: As the object's speed increases, the air resistance force also increases. This opposing force slows the acceleration.
3. Reaching Equilibrium: At a certain speed, the force of air resistance becomes equal and opposite to the force of gravity. At this point, the net force on the object is zero.
4. Constant Velocity: With no net force acting on it, the object stops accelerating and continues to fall at a constant speed. This constant speed is called terminal velocity.
Factors Affecting Terminal Velocity:
* Mass: A heavier object has a greater gravitational force acting on it, leading to a higher terminal velocity.
* Shape: A streamlined shape reduces air resistance, resulting in a higher terminal velocity. A wider, flatter shape experiences more air resistance, leading to a lower terminal velocity.
* Surface Area: Larger surface area increases air resistance, lowering terminal velocity.
* Density of the Air: Denser air creates more resistance, leading to a lower terminal velocity.
Important Note: Terminal velocity is not a fixed value. It can change depending on the factors mentioned above. For example, a skydiver can adjust their terminal velocity by changing their body position to alter their surface area and air resistance.
