Why do heavier things fall faster than lighter things if dropped from a certain height?

This is not an accurate statement. Heavier objects do not fall faster than lighter objects when they are dropped from a certain height IF there is no resistance from the air. So, if you were in a vacuum, the two things would fall at the same rate.

The only thing that makes a heavier thing fall faster than a lighter thing in real life is the fact that heavier objects usually have more mass per surface area than do lighter things. Because of this, the resistance from the air slows the fall of the lighter thing. But if both objects had the same ratio of mass to surface area, they would fall at the same rate.

So, the only thing that makes a lighter thing fall more slowly is the resistance from the air. More.

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