Quick Answer:The Shape of Earth due to Rotation is a demonstration model whose sphere bulges at the equator and flattens at the poles as it spins. It shows why rotation makes the Earth an oblate spheroid rather than a perfect sphere.
Last updated: 18 October 2026
Key Features
Rotating sphere visibly changes shape as it spins.
Shows the equatorial bulge and flattening at the poles.
Explains the effect of centrifugal force on a rotating body.
Turned by hand, or by motor where the optional motor is fitted.
Technical Specifications
Specification
Value
Components
Rotating sphere, base stand
Rotation
Manual, or motor-driven (motor optional)
How It Is Used
The model stands on a steady surface and the sphere is spun by hand or by switching on the motor. As it turns, the class watches the middle widen and the ends flatten, and the teacher links this to centrifugal force and to the real shape of the Earth. Comparing it with a perfect sphere makes the difference clear.
Frequently Asked Questions
Why does the sphere in the Shape of Earth due to Rotation model change shape?
As it spins, centrifugal force pushes the middle outward, so the sphere bulges at the equator and flattens at the poles, the oblate spheroid shape of the Earth.
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