Have you ever wondered why a feather and a coin will have the same acceleration when they are falling in a vacuum? It is because of their mass.
The heavier an object is, the more force it takes to accelerate it. This means that both coins and feathers will experience the same amount of force as they fall at the same time due to gravity.
However, this isn’t true for other forces which might be acting on them! The result of this is that the force of gravity on a feather and coin will be equal when falling. This means that all objects have “equal acceleration” in a vacuum, which helps to show why we don’t see them accelerating around Earth! (end).
This blog post will provide more details about why a feather and coin have the same acceleration.