# What does the g stand for when computing moment of inertia

• Kevinh
In summary, the "g" in the formula for computing moment of inertia stands for the strength of the gravitational field in the vicinity of the object. In the case of a physical pendulum, this formula can also be used to calculate the period of the pendulum's oscillation.

#### Kevinh

What does the "g" stand for when computing moment of inertia

What does the "g" stand for when computing moment of inertia, does it stand for gravity 9.80 m/s^2 or what. Thanks.

What is e here?

If this formule is about physical pendulum in gravitational field, then g is gravity (strength of gravitational field) in the vicinity of pendulum.

I=mghT^2/4pie^2

4pie^2 should be 4pi^2 I guess. This is an experiment where different objects are being placed on a knife edge through the object to test for experimental interia compared to calculated inertia.

Seems to me like a formula for period of physical pendulum. Then g is gravity indeed.

## 1. What is moment of inertia?

Moment of inertia is a measure of an object's resistance to changes in its rotational motion. It is calculated by summing the mass of each particle in the object multiplied by the square of its distance from the axis of rotation.

## 2. How is moment of inertia related to the letter "g"?

The letter "g" in the equation for moment of inertia represents the acceleration due to gravity. This is because an object's weight and mass are directly related to its moment of inertia.

## 3. Can the letter "g" be replaced with a different value when calculating moment of inertia?

Yes, the value for "g" can be replaced with a different acceleration due to gravity if the object is not on Earth. This is because the force of gravity and therefore the moment of inertia will be different on other planets or in space.

## 4. What are the units for moment of inertia?

The units for moment of inertia depend on the units used for mass and distance in the equation. However, in the SI system, it is typically measured in kilograms times meters squared (kg*m^2).

## 5. How is moment of inertia used in practical applications?

Moment of inertia is an important concept in many fields, including physics, engineering, and robotics. It is used to analyze the rotational motion of objects and to design structures that can resist changes in rotational motion. It is also used in the development of machines and vehicles that require precise control of their rotational motion.