Mechanics

# Gravitational field strength

## What is the Gravitational field?

“The space around the earth in which earth can exert a force of attraction on other bodies is called gravitational field.”A basic fact of gravitation is that particles exert forces on one another. This is a direct interaction between the two particles and is called the action at a distance because the two particles interact even though they are not in contact.
Another point of view in the field concept. The gravitational field is a force field. The gravitational field exists around a particle. Whenever another particle enters the gravitational field, it will experience an attractive force. The field, therefore, plays an important role in our thinking about the forces between particles. According to this view, we first determine the gravitation field established by the given distribution of particles.
Secondly, we calculate the gravitational field exerted on another particle placed in its field. When a body is placed in the vicinity of the earth, it will experience an attractive force equal to the weight of the body m0 g. The direction of the gravitational force is towards the center of the earth. The gravitational field becomes weaker and weaker as we got farther and farther away from the earth.
The gravitational field is an example of a vector field, each point in this field having a vector associated with it. There are also scalar fields, such as temperature fields in a heat-conducting solid. The gravitational field arising from a fixed distribution of matter is also an example of a static field because the value of the field at a given point does not change with time.