How many Glob damn frakking times do I need to explain to these kids that "moment of inertia" and "inertia" are not synonymous?

It's totally mental. I have to tell them every frakking time anything about rotation comes up. I don't know how to get through to them. I've tried explaining the difference and telling them that it really isn't a trivial mistake, but they still act like "inertia" is just a shorter way of saying "moment of inertia."