Question

when we go ina amusement park, and sit in a giant wheel and when we come down ,why we feel that our stomach is tickling?

Answer 1

when the giant wheel is coming downward there's an upward pseudo force acting in upward to us in addition to the body weight and because our body is not used to this we feel ticklish in stomach , you'll get the similar feeling when you get in lift going downward with acceleration