It's not entirely true that all objects hit the ground at the same time. The statement you're likely referring to is a simplification often used to explain gravity. Here's a breakdown:

In a vacuum, all objects fall at the same rate. This is due to the fact that gravity exerts the same force on all objects, regardless of their mass. This means that in a vacuum, a feather and a bowling ball will fall at the same rate.

In the real world, air resistance plays a significant role. Air resistance is the force that opposes the motion of an object through the air. It depends on the object's shape, size, and speed.

* Light objects with large surface area: Experience greater air resistance, slowing their descent. This is why a feather falls much slower than a bowling ball.

* Heavy objects with small surface area: Experience less air resistance, allowing them to fall faster.

Therefore, the statement "all objects hit the ground at the same time" is only true in a vacuum where there's no air resistance.

Key takeaways:

* Gravity pulls all objects towards the Earth with the same force.

* In the absence of air resistance, all objects fall at the same rate.

* Air resistance significantly affects the falling speed of objects in the real world.

Let me know if you'd like to delve deeper into any of these concepts!