system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible to run up falling objects?
gpt
Run probably isn't the right word for it.  If you're on an object that's free falling, you're going to be as near weightless as makes no difference.  That makes running difficult.  
Nothing wrong with climbing though as long as you have enough handholds.  If you can climb faster than the terminal velocity of whatever the falling object is, you can make upward progress.