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The Coriolis effect

The Coriolis force

The Coriolis effect can be demonstrated by the following experiment.
Imagine a disk which first does not rotate. A mass m which moves with constant velocity v from the center of the disk towards the rim moves on a straight line. No force affects the movement of the mass.

Now let the disk rotate with a constant angular velocity w (see figure above). Still no external force affects the mass. An observer who rotates with the disk - and has no indication of this rotation - sees the mass moving along a bended path. This observer would state that the mass must have been affected by a "force", which acts perpendicular to the direction of movement. This fictitious "force" is called the Coriolis force FcGo to formula.

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