Here's why:
* Gravity's Constant Pull: The force of gravity pulls on all objects equally, regardless of their mass or shape.
* Acceleration due to Gravity: This means all objects accelerate towards the Earth at the same rate, approximately 9.8 m/s².
In a vacuum (no air resistance), the only force acting on both the feather and the penny is gravity. Since they both accelerate at the same rate, they would reach the ground simultaneously.
Air Resistance: The reason a feather falls slower than a penny in normal conditions is because of air resistance. Air resistance is a force that opposes the motion of objects through the air. It depends on factors like the object's shape, size, and speed. The feather, with its large surface area, experiences much more air resistance than the penny.