When I was young, I had a problem learning to differentiante between the 'ㅓ' and 'ㅗ' sounds. My way of remembering was to think of 'ㅓ' as the weaker (i.e. less

When I was young, I had a problem learning to differentiante between the 'ㅓ' and 'ㅗ' sounds. My way of remembering was to think of 'ㅓ' as the weaker (i.e. less powerful) sound associated with "dumb" or "uh" (same pronunciation), and 'ㅗ' as the stronger sound associated with an exclamation of "oh!" (same as your short 'o' sound reference).