Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
When gravity's pull on an object causes it to move downward, resulting in a rapid and uncontrolled change in its position or orientation over time, this is the fall.
External reference — all senses of the word “fall” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.