<P> The Earth , because it rotates once a day on its axis , constitutes a rotating reference frame . Because the rotation is slow , the fictitious forces it produces are small , and in everyday situations can generally be neglected . Even in calculations requiring high precision , the centrifugal force is generally not explicitly included , but rather lumped in with the gravitational force : the strength and direction of the local `` gravity '' at any point on the Earth 's surface is actually a combination of gravitational and centrifugal forces . </P>
<P> The Earth , because it rotates once a day on its axis , constitutes a rotating reference frame . Because the rotation is slow , the fictitious forces it produces are small , and in everyday situations can generally be neglected . Even in calculations requiring high precision , the centrifugal force is generally not explicitly included , but rather lumped in with the gravitational force : the strength and direction of the local `` gravity '' at any point on the Earth 's surface is actually a combination of gravitational and centrifugal forces . </P>
what is the centrifugal force of the earth
what is the centrifugal force of the earth
any point on the Earth 's surface
any point on the Earth 's surface