Table of Contents

- 1 How does the value of g varies on Earth Class 9?
- 2 How does g vary above the surface of Earth?
- 3 How much does gravity vary on earth?
- 4 Is the value of g changes from place to place?
- 5 How does g vary with rotation of earth?
- 6 What is the value of G on the surface of the Earth?
- 7 What is the accepted value of G?

## How does the value of g varies on Earth Class 9?

As is evident from both the equation and the table above, the value of g varies inversely with the distance from the center of the earth. In fact, the variation in g with distance follows an inverse square law where g is inversely proportional to the distance from earth’s center.

**Does g vary on Earth?**

Gravity is often assumed to be the same everywhere on Earth, but it varies because the planet is not perfectly spherical or uniformly dense. In addition, gravity is weaker at the equator due to centrifugal forces produced by the planet’s rotation.

### How does g vary above the surface of Earth?

Variation of g with Height This is the acceleration due to gravity at a height above the surface of the earth. Observing the above formula we can say that the value of g decreases with increase in height of an object and the value of g becomes zero at infinite distance from the earth.

**How does value of g varies with altitude?**

The gravitational acceleration decreases with altitude, as shown by the solid line in Figure 1 (left). g is equal to 9.5 m/s2 at 100 km altitude, which is 9\% larger than 8.7 m/s2. However, at 500 km altitude, g is close to 8.45 m/s2, which is close to 3\% smaller than 8.7 m/s2.

## How much does gravity vary on earth?

Gravity on the Earth’s surface varies by around 0.7\%, from 9.7639 m/s2 on the Nevado Huascarán mountain in Peru to 9.8337 m/s2 at the surface of the Arctic Ocean. In large cities, it ranges from 9.7806 in Kuala Lumpur, Mexico City, and Singapore to 9.825 in Oslo and Helsinki.

**How does g change above and below the surface of earth?**

Variation of g with Depth:The value of g is directly to the depth below the earth surface therefore, it increases with increasing depth but at the Centre of the earth it becomes equal to zero. Variation of g due to Rotation of Earth: The value of g decreases with the increase in the rotation of the earth.

### Is the value of g changes from place to place?

The value of G does not change from place to place. It is a universal constant. The gravitational constant is the constant of proportionality in Universal Gravitation law given by Issac Newton and is commonly denoted by ‘G’. This is different from ‘g’, which denotes the acceleration due to gravity.

**Why the value of g is zero at the Centre of the earth?**

At the centre of Earth, force due to any portion of the Earth at the centre will be cancelled due to the portion opposite to it. Thus, the gravitational force at the centre on any body will be 0. Since, from Newton’s law, we know F= mg. Thus, the value of g is zero at the centre of the Earth.

## How does g vary with rotation of earth?

In combination, the equatorial bulge and the effects of the surface centrifugal force due to rotation mean that sea-level gravity increases from about 9.780 m/s2 at the Equator to about 9.832 m/s2 at the poles, so an object will weigh approximately 0.5\% more at the poles than at the Equator.

**How is the value of g on the earth related to the mass of the Earth and its radius derive the expression?**

The value of g is influenced by the mass and radius of earth as g is acceleration of an object due to earth’s gravitational force. The earth pulls everything on its surface towards its centre,so the distance between the centre and the object which is indirectly the earth’s radius,has to be considered.

### What is the value of G on the surface of the Earth?

The value of g at the Earth’s surface is about 9.8 m/s2.

**What is the value of the G constant on Earth?**

The value of the gravitational constant, G, is constant throughout the Universe and is 6.6740831313131 x10-11N m2/kg2. And since it is constant it would be the same anywhere in the Universe (including the Earth and the Moon).

## What is the accepted value of G?

Today, the currently accepted value is 6.67259 x 10-11 N m2/kg2. The value of G is an extremely small numerical value. Its smallness accounts for the fact that the force of gravitational attraction is only appreciable for objects with large mass.

**What is the value of G on other planets?**

All in all, gravity runs the gamut here in the solar system, ranging from 0.38 g on Mercury and Mars to a powerful 2.528 g atop Jupiter’s clouds.