Do we have Coriolis acceleration on the slider or is it purely centripetal?

[firavia]

according to the figure attached below , do we have a coriolis acceleration on the slider and why ?

why can't we say that it is a centripetal acceleration ?

I want to know the difference between coriolis accelration and centrepetal acceleration ,

cause As I know , coriollis acceleration show's up only if we are studying the object in a rotational frame, why are we concidering here that it is a rotaitonal frame and not an inertial frame ??

 

[firavia]

I hope someone would answer my question