In general, child support is a percentage of net income. In Illinois, for example, it's 20% of net income for one child, 25% for two, etc. Income includes almost everything, including overtime, unemployment benefits and workers compensation, but not welfare payments or SSI.
yes see links below
no
no
Generally, no.
NO!
Yes
yes
no
Yes. They are still the child's parent and responsible for supporting their child.
if the NCP has some source of income, such as unemployment (but not SSI or public assistance), or substantial assets ANSWER But you should negotiate a reduction and file it with the courts
no
Yes, it can. Moving in with the other parent is grounds for "flipping" child support payments. However, this must be done by court order.