# Earth's Gravity if the Earth rotated the opposite direction

1. Sep 29, 2011

### rogersjc

I think this is an interesting question and it happens to be a problem I have to solve. If the Earth rotated about its axis at the same rate it does right now how would that affect the gravity at the equator and the north pole?

I personally do not think it will change it because I believe that the gravity it is function of lattitude size and the rate of rotation.

2. Sep 29, 2011

### mathman

Your question is confusing. If the axis stays the same, gravity is unaffected. The difference between the equator and the pole is a result of the equatorial bulge, resulting from rotation.

3. Sep 29, 2011

### HallsofIvy

The gravitational force depends only upon the mass of the earth (and the object being attracted) and has nothing to do with the rotation of the earth. The "net force" on an object, the gravitational force minus the "centrifugal force" depends upon the magnitude of the rotation of the earth, but not the direction.

4. Sep 29, 2011

### rogersjc

So your saying that it doesn't matter what direction the Earth rotates? The magnitude will be the same.

5. Sep 29, 2011

### Vorde

Yes, If you need convincing the classical equation for gravity makes no mention of rotation.