Questions about example sentences with, and the definition and usage of "Ends"

A: "Her hair has split ends."
"Let's go when the movie ends."

A: 'On both ends' means 'on opposite sides'. From the context given, I would assume it means they have different opinions on something (hence they are on both ends, or opposite sides, of the spectrum).
There's an "s" on the end of the word "end" because it's plural - there are 2 endS, or two sides if you think of it that way. Was this clear?