"Use" and its Uses

He got used to the bad weather. She can use a computer. She used to knit. He bought a used car.

I have often marveled that we casually use that same little base of "use" as if the different uses are the same, or that whatever word we use makes no difference as long as I and the people I speak or write to understand what I mean.

Perhaps this little quirk is no more complicated than we are simply used to using these somewhat unrelated uses.