* Air Resistance: The most significant factor is air resistance. As the object falls, it experiences a drag force from the air, which increases with speed. This means the acceleration is not constant but decreases as the object picks up speed.
* Terminal Velocity: Eventually, the drag force will equal the force of gravity, and the object will reach a constant velocity called terminal velocity. At this point, the acceleration becomes zero.
Therefore, the object's motion is better characterized as follows:
* Initially: High acceleration due to gravity, slightly reduced by air resistance.
* As Speed Increases: Acceleration decreases due to increasing air resistance.
* At Terminal Velocity: Acceleration becomes zero, and the object falls at a constant speed.
Note: The effect of air resistance is more pronounced for lighter objects with larger surface areas. For a very heavy object thrown from a short distance, air resistance may be negligible for a brief period, and the acceleration could be considered approximately uniform. However, even for heavy objects, air resistance will eventually become significant, and the acceleration will not be uniform throughout the entire fall.
