system
Given the following post, respond as if you're commenting on Reddit:
human
Why do objects of varying mass accelerate towards the earth's surface at the same rate?
gpt
Heavier things need more force to move them than light things do.  
Heavier things experience more force from gravity than light things do.

It turns out that these *exactly balance out*. The extra force you get for being heavier is exactly the amount you need to cancel out the fact that you need more force to accelerate because you're heavier. So everything accelerates at the same rate.