# Effect of Stopping Earth's Rotation on Gravity/Orbit

• Rog
In summary, the conversation discusses the effects of a film where a weapon must stop the Earth from spinning. The discussion focuses on the orbital effect of this on the Earth's rotation in relation to the sun and moon, as well as the gravitational effect on people standing on the Earth. It is mentioned that people are lighter at the equator due to centrifugal force, and the Earth's radius is slightly bigger at the equator.

#### Rog

I have not seen the film however in the advertising they say that they must stop a weapon that will stop the Earth spinning. I was wondering what orbital effect this would have on the Earth in realtion to the sun and moon. I also wondered what gravitational effect this would have on us standing on the earth. Basically is there any effect from rotation and centrifugal force forcing us out therefore acting against gravity from the spin. If this is the case, are we heavier if we stood at the poles and lighter at the equator due to our position in relation to the spin of the earth??

PLease forgive my newbie posting and if this is the wrong part of the forum for this.

Originally posted by Rog
I was wondering what orbital effect this would have on the Earth in realtion to the sun and moon.
None.
I also wondered what gravitational effect this would have on us standing on the earth. Basically is there any effect from rotation and centrifugal force forcing us out therefore acting against gravity from the spin. If this is the case, are we heavier if we stood at the poles and lighter at the equator due to our position in relation to the spin of the earth??
You are lighter at the equator, by about 5%, due to the centrifugal force. The core's rotation, however, doesn't matter -- only the rotation at the surface.

- Warren

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You are lighter at the equator, by about 5%, due to the centrifugal force.

The Earth's radius is also slightly bigger at equator.