What is the deal with roller coaster rides?

[Guest guest]

I was at Six Flags this past week with the family and rode on a couple of the

kiddie spinning rides and two water rides.  Nothing big and no large drops, but

my head was reeling when they were over.  I knew better, but wanted the kids to

have memories of me doing more than holding drinks and watching the baby.

So is there something about the change in pressure from the spinning rides

(think tea cups at a carnival)?  I did not ride on anything that you would have

to be an adult to go on....I dont like them really.....

Just wondering.

in Texas