# Relation Between G and g

The acceleration on an object due to the gravity of any massive body is represented by g (small g). The force of attraction between any two unit masses separated by unit distance is called universal gravitational constant denoted by G (capital G). The relation between G and g is not proportional. That means they are independent entities.

## G and g

In physics, G and g can be related mathematically as –

 $g=\frac{GM}{R^{2}}$

Where,

• g is the acceleration due to the gravity of any massive body measured in m/s2.
• G is the universal gravitational constant measured in Nm2/kg2.
• R is the radius of the massive body measured in km.
• M is the mass of the massive body measured in Kg

### G and g relation

Although there exists a formula to express the relation between g and G in physics, there is no correlation between acceleration due to gravity and universal gravitation constant, as the value of G is constant. The value of G is constant at any point in this universe. G and g are not dependent on each other.

## What is G and g?

The G and g are distinct entities in physics. Below is the table of the difference between G and g.

Symbol Definition Nature of Value Unit

### Acceleration due to gravity

g The acceleration experienced by a body under free fall due to the gravitational force of the massive body Changes from place to place.

Acceleration due to gravity of the earth is 9.8 m/s2

m/s2

### Universal Gravitational Constant

G The force of attraction between two objects with unit mass separated by a unit distance at any part of this universe. Constant at any point in this universe.

G = 6.673×10-11 Nm2/kg2

Nm2/kg2

## g Formula

According to the universal law of gravit,

$F=\frac{GMm}{R^{2}}$ ————(1)

From Newton’s second law of motion we can write –

$g=\frac{F}{m}$ ———–(2)

Substituting equation (1) in (2) we get-

$g=\frac{GMm}{R^{2}m}$

Thus, we arrive at the g formula in physics as –

$\Rightarrow g=\frac{GM}{R^{2}}$

Hope you understood the relation and conversion between G and g along with formula, definition, difference and values.

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#### 1 Comment

1. Abhijeet Das

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