* Air Resistance: The primary reason objects don't fall at the same velocity is air resistance. Air resistance, also known as drag, is a force that opposes the motion of an object through the air. The amount of air resistance depends on:
* Shape: A wider or less streamlined object will experience more air resistance.
* Size: A larger object will experience more air resistance.
* Speed: As an object falls faster, air resistance increases.
* Terminal Velocity: As an object falls, its speed increases due to gravity. However, air resistance also increases. Eventually, the force of air resistance equals the force of gravity, and the object stops accelerating. This is called terminal velocity. Objects with more air resistance will reach a lower terminal velocity than objects with less air resistance.
The classic example:
Imagine a feather and a bowling ball. Both experience the same acceleration due to gravity. However, the feather has a much larger surface area and a lighter weight, making it much more susceptible to air resistance. The feather will reach its terminal velocity much quicker than the bowling ball, meaning it will fall much slower.
In a vacuum:
If you were to perform this experiment in a vacuum, where there is no air resistance, you would see that the feather and bowling ball would fall at the same rate, reaching the ground simultaneously. This is because in the absence of air resistance, the only force acting on them is gravity, and they both experience the same acceleration.
In conclusion:
While acceleration due to gravity is constant, objects don't fall at the same velocity because of air resistance. The amount of air resistance depends on the object's shape, size, and speed, which ultimately determines its terminal velocity.
