# Apparent gravity

From AMS Glossary

## apparent gravity

(

*Also called*effective gravity, virtual gravity.) For a rotating planet such as Earth the resultant of the force (per unit mass) due to gravity and the centrifugal force.Apparent gravity is given by where

**g**is the force (per unit mass) due to gravitational attraction,**Ω**is the angular velocity of the planet, and**r**is the position vector relative to its center. Like**g**,**g*** depends only on position. Within the earth's atmosphere the magnitude of the centrifugal force is less than 0.03% of**g**.*See*apparent force.Dutton, J. A. 1976. The Ceaseless Wind. p. 225.