+0
A: Sit on the turnstile/merry go round(what do you call the round board in a playground on which kids sit and it has to be spin manually) and I'll spin you.
B: I'll get sick (I have motion sickness? How to say this naturally)

Thanks ina dvance.
+0
It's a merry-go-round. A "turnstile" is a style/stile [gate] that turns on a central spindle to let the person past.

"I will be sick if you spin me/it too fast."
+0
A: Sit on the turnstile/merry go round(what do you call the round board in a playground on which kids sit and it has to be spun spin manually) and I'll spin you.
I'll be sick = I will vomit
I'll get sick = I will be unwell, I may or may not vomit.
Teachers: We supply a list of EFL job vacancies
Comments  
I will GET sick if you spin me/it too fast."

Thanks Feebs. I wonder if I could use 'get' instead.
 Optilang's reply was promoted to an answer.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thanks for the correction and answer, Optilang.