In most cases, you would not have a problem unless you are not flying to the country your passport is issued from.
Try leaving the country
Only if leaving country
If you are leaving the country you live in, yes.
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You always need a passport to enter another country
If they are leaving the country.
Because you are leaving the country they need to know who you are
That would depend on where you are travelling from and your nationality. If you are arriving from mainland Europe you will need a Passport to enter. Anyone leaving the Country and returning needs a Passport.
If you want to enter a foreign country you do. The passport isn't for leaving the country of citizenship. Its for entry into foreign countries. Even some cruise lines require a passport. To get back into the country you also need one. All American citizens now need a passport.
Owing excess child support does not invalidate a passport. That doesn't mean you can't be prevented from the leaving the country.
None, within the United States. A passport if they are leaving the country.
To get a UK passport you must be a citizen of the UK.A passport is proof of identity and proof of citizenship. Therefore you can only get a passport for a country if you are a citizen of that country (with very few exceptions).