Here's why:
* Newton's Law of Universal Gravitation: The force of gravity between two objects depends on their masses and the distance between their centers.
* Earth's Shape: The Earth is not a perfect sphere, it's slightly flattened at the poles and bulging at the equator. This means the distance from your center to the Earth's center is slightly less at the poles.
* Gravity at the Poles: Therefore, the force of gravity is slightly stronger at the poles than at the equator.
While the difference in gravitational force is small (about 0.5% stronger at the poles), it's still measurable.
It's important to note: The difference in gravity due to your location on Earth is much smaller than the difference in gravity caused by the mass of the Earth itself.
