Yet another example of a “pseudoforce” is the Coriolis force, more complicated than centrifugal
force, arising from motion perpendicular to the axis of rotation in a non-inertial reference frame.
The example of a merry-go-round works to illustrate Coriolis force as well: imagine sitting at the
center of a spinning merry-go-round, holding a ball. If you gently toss the ball away from you and
watch the trajectory of the ball, you will notice it curve rather than travel away in a straight line. In
reality, the ball is traveling in a straight line (as viewed from an observer standing on the ground),
but from your perspective on the merry-go-round, it appears to be deflected by an invisible force
which we call the Coriolis force.
In order to generate a Coriolis force, we must have a mass moving at a velocity perpendicular to
an axis of rotation