The **Euler force** is one of three fictitious forces found in rotating frames of reference, the others being the centrifugal and Coriolis forces. It depends on the angular acceleration of the rotating reference frame and the position of a particle in that frame. It can be described mathematically as:

where is the angular acceleration and is the position vector.^{[1]} As the angular acceleration of the earth is very small it can normally be neglected on Earth.

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