What happens when you rip a dollar bill?

Question

Is it illegal to ruin money? I know that if 2/3rds of the bill is still in tact, it is considered legal tender, but what does it mean when its ripped in half? Does the dollar lose value completely? Is it considered 'defacing federal property'? Do people or the government own money? Or what about coins, why is it okay to break coins but not bills? Does anybody know?

Answer 1

 well at like amusment parks they have those machines that flaten coins and make them into cartoon characters faces. how can they do that?