## Gravitation and Gravity: Introduction

## FAQs on Which Quantity is Zero at the Centre of the Earth

1. What is the acceleration due to gravity?

The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/s2 is its SI unit. It has a direction as well as a magnitude. It is a vector quantity as a result. The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.

2. Explain the relationship between Gravity and Weight.

The force with which a body is drawn towards the earth by gravity is referred to as weight. It simply refers to the gravitational force Fg. All objects close to the earth are subject to the force of weight. By multiplying the mass of the body by the gravitational acceleration (g = 9.8 m/s2), one can determine an object's weight.

Fg = mg

Where,

Fg is the force of gravity

m is the mass of the object

g is the acceleration due to gravity

Many people mistake weight for mass. It is important to remember that mass, or an object's inertia, is a measure of how much a body resists motion. Despite having a close connection, they have different meanings. While weight is a force and has units of N, mass is measured in kilogrammes (kg).

3. Difference between Gravity and Gravitational Potential Energy.

A body is drawn towards the centre of the earth or another mass-containing physical body by the force known as gravity. The weakest category of fundamental forces in nature is the force of gravity. Even so, it maintains the cohesion of the solar system and galaxies. Over the entire surface of the earth, free fall occurs at the same speed. According to calculations, this speed is 9.8 metres per second.

On the other hand, gravitational potential is the effort put forth to bring a unit mass from infinity to any point in a gravitational field. The gravitational potential energy of a particle at any point can be calculated by the work required to move the particle from infinity to that location. The gravitational potential energy of a body determines the direction of motion of a body in the gravitational field of another body. The sum of the potential energy at the point where the body is due and the particle's mass is known as the gravitational potential energy.

4. Why do we feel with less weight on the equator than at the North Pole?

It's because there is more centrifugal force to counteract the effects of gravity at the equator. As a result, the equator has a lower total weight than the poles.

5. How do spaceships create artificial gravity?

By rotating around its axis, a spacecraft could create an artificial gravity field. The rotation's radius should be substantial to accomplish this. A ship could also produce artificial gravity by continuously moving forward.