Here's why:
* Gravity: The force of gravity acts on all objects with mass, regardless of whether they are in a vacuum or not. In a vacuum, there's nothing to hinder the effect of gravity.
* No Air Resistance: In a vacuum, there is no air to push against, so there's no air resistance to slow the object down.
* Constant Acceleration: In a vacuum, the only force acting on an object is gravity, so its acceleration is constant. This means the object will continue to speed up at the same rate until it hits something or reaches terminal velocity (in the case of objects falling towards a planet).
Example:
A feather and a bowling ball dropped simultaneously in a vacuum chamber will fall at the same rate and hit the ground at the same time. This is because the force of gravity acts equally on both objects, and there's no air resistance to make the feather fall slower.
Key Point: The key to understanding this is that objects in a vacuum don't "feel" anything, but they still experience forces like gravity, which causes them to accelerate.
