Assuming there is enough friction between the fly and the turntable to prevent any slipping, describe all the external (i.e. non-inertial) forces acting on the fly, and identify in which direction each force acts. If any of these forces are a combination of two or more physical principles, also list those.
Bonus: The magnitudes of most of these forces can be calculated from the information provided, but some cannot. Which ones cannot be calculated and why?