Gravity Maximum: Understanding 'g' Value

The acceleration due to gravity, denoted as g, is not uniform across the Earth's surface. Its value depends on factors like altitude, latitude, and the Earth's rotation and shape.

Factors Affecting Gravity ('g')

• Earth's Rotation: The Earth spins on its axis. This rotation creates a centrifugal effect that acts opposite to the gravitational pull, effectively reducing the value of g. This effect is strongest at the Equator and negligible at the Poles.
• Earth's Shape: The Earth is not a perfect sphere; it's an oblate spheroid, bulging at the Equator and flattened at the Poles. This means the distance from the Earth's center is greater at the Equator than at the Poles. Since gravitational force weakens with distance (inversely proportional to the square of the distance), this makes g smaller at the Equator.

Gravity Value at Different Locations

Considering both factors:

• At the Equator, both the centrifugal effect (maximum) and the larger distance from the Earth's center reduce the value of g.
• At the Poles, the centrifugal effect is virtually zero, and the distance from the Earth's center is minimum. These conditions result in the maximum value of g.
• The Tropics of Cancer and Capricorn are intermediate latitudes where these effects are less pronounced than at the Equator but more significant than at the Poles.

Therefore, the value of g is maximum at the Poles.