* Free Fall Definition: Free fall is defined as the motion of an object under the influence of gravity alone.
* Air Resistance: As an object falls through the air, it encounters resistance from the air molecules. This resistance, known as air drag, acts in the opposite direction of the object's motion.
* The Impact of Air Resistance: Air resistance increases with the object's speed and the size and shape of the object. It can significantly slow down the object's acceleration and make it deviate from a true free-fall path.
Examples:
* A Feather vs. A Rock: A feather falls much slower than a rock because it experiences greater air resistance due to its larger surface area.
* Skydivers: Skydivers use their bodies and parachutes to control their descent by manipulating the air resistance acting on them.
How to Get Closer to Free Fall:
* Vacuum: The only way to truly experience free fall on Earth is in a vacuum chamber where there is no air resistance.
* High Altitude: Objects dropped from very high altitudes have more time to accelerate before air resistance becomes significant. This is why objects in the upper atmosphere, like satellites, can experience near free fall conditions.
In Summary:
While gravity is always acting on objects near the Earth's surface, air resistance often interferes with free fall, making it difficult to observe true free-fall motion.
