1. Gravity: The primary force driving the fall, constant at 9.8 m/s² on Earth. This means an object accelerates downwards by 9.8 meters per second every second.
2. Air Resistance (Drag): This force opposes the object's motion and increases with the object's speed and the air's density. It depends on:
* Shape: Streamlined objects (like a bullet) encounter less drag than objects with a larger surface area (like a parachute).
* Size: Larger objects experience more drag.
* Speed: Drag increases exponentially with speed.
3. Mass: A heavier object will fall faster initially due to gravity, but air resistance will eventually equalize the downward force.
Terminal Velocity:
* As an object falls, its speed increases, and air resistance grows. Eventually, the drag force will equal the force of gravity, resulting in a constant speed called terminal velocity.
* Terminal velocity is the maximum speed an object can reach while falling through the air.
* Lighter objects with larger surface areas (like a feather) have lower terminal velocities than heavier, streamlined objects (like a rock).
Factors Affecting Terminal Velocity:
* Density of Air: Thicker air (like at lower altitudes) creates more resistance, resulting in lower terminal velocities.
* Altitude: Thinner air at higher altitudes leads to higher terminal velocities.
In Summary:
* Objects don't fall at a constant speed through air; they accelerate until reaching terminal velocity.
* Terminal velocity is the maximum speed an object can reach while falling, and it depends on the object's shape, size, and mass, as well as the density of the air.
It's important to remember:
* The speeds mentioned above are rough approximations. The actual speed of a falling object can vary significantly based on the factors listed above.
* Understanding how air resistance affects falling objects is crucial in fields like aerodynamics and skydiving.
