1. The problem statement, all variables and given/known data A 45-kg merry-go-round worker stands on the ride's platform 6.3m from the center. If her speed as she goes around the circle is 4.1 m/s, what is the force of friction necessary to keep her from falling off the platform? 2. Relevant equations f=ma Ac=v^2/r mu=v^2/rg (derived from [mu]g=v^2/r 3. The attempt at a solution I don't believe the 6.3m is relevent to the problem. I believe Fnet=sigmaFx=theta=m*a I am not really sure how to attack this problem and some help would be very nice.