Simplify the following text for a Grade 8 native English-speaking person.
Original: The Coriolis force acts in a direction perpendicular to the rotation axis and to the velocity of the body in the rotating frame and is proportional to the object 's speed in the rotating frame .
Simplified: It is a fictitious force that acts upon all bodies which are described using a rotating frame of reference . The force is perpendicular to both the axis of movement of the body it acts on as well as that of the frame of reference .