In physics, a **gravitational field** is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body. Thus, a gravitational field is used to explain gravitational phenomena, and is measured in newtons per kilogram (N/kg). In its original concept, gravity was a force between point masses. Following Newton, Laplace attempted to model gravity as some kind of radiation field or fluid, and since the 19th century explanations for gravity have usually been sought in terms of a field model, rather than a point attraction.

In a field model, rather than two particles attracting each other, the particles distort spacetime via their mass, and this distortion is what is perceived and measured as a "force". In such a model one states that matter moves in certain ways in response to the curvature of spacetime, and that there is either *no gravitational force*, or that gravity is a fictitious force.

The **gravity of Earth**, denoted * g*, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in meters per second squared (in symbols, m/s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1). It has an approximate value of 9.81 m/s2, which means that, ignoring the effects of air resistance, the speed of an object falling freely near the Earth's surface will increase by about 9.81 metres (32.2 ft) per second every second. This quantity is sometimes referred to informally as

There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth, given by the equation *ma* = *F* (*force* = *mass* × *acceleration*). However, other factors such as the rotation of the Earth also contribute to the net acceleration.

The **surface gravity**, *g*, of an astronomical or other object is the gravitational acceleration experienced at its surface. The surface gravity may be thought of as the acceleration due to gravity experienced by a hypothetical test particle which is very close to the object's surface and which, in order not to disturb the system, has negligible mass.

Surface gravity is measured in units of acceleration, which, in the SI system, are meters per second squared. It may also be expressed as a multiple of the Earth's standard surface gravity, *g* = 9.80665 m/s2. In astrophysics, the surface gravity may be expressed as log *g*, which is obtained by first expressing the gravity in cgs units, where the unit of acceleration is centimeters per second squared, and then taking the base 10 logarithm. Therefore, as gravity affects all things equally, regardless of their mass in grams or kilograms, and because 1 m/s2 = 100 cm/s2, the surface gravity of Earth could be expressed in cgs units as 980.665 cm/s2 and at base 10 logarithm (log *g*) as 2.992.

In journalism, a **human interest story** is a feature story that discusses a person or people in an emotional way. It presents people and their problems, concerns, or achievements in a way that brings about interest, sympathy or motivation in the reader or viewer.

Human interest stories may be "the story behind the story" about an event, organization, or otherwise faceless historical happening, such as about the life of an individual soldier during wartime, an interview with a survivor of a natural disaster, a random act of kindness or profile of someone known for a career achievement.

Algeria · Nigeria · Sudan · Ethiopia · Seychelles

Uganda · Zambia · Kenya · South Africa

Afghanistan · Pakistan · India

Nepal · Sri Lanka · Vietnam

China · Hong Kong · Macau · Taiwan

North Korea · South Korea · Japan

Malaysia · Singapore · Philippines · Thailand

- How would the force of gravity change if the earth were the same mass but half its current diameter?
- Is gravity defined by mass or size? If mass, would a planet with the exact dimensions of ours have the same gravity if it were made up of lighter elements?
- Does the mass change due to size?
- If earth's mass increased, but the earth's diameter didn't change how would the acceleration of gravity near earth's surface change?
- If the radius of the Earth were to shrink by half without any change in Earth's mass, what would the value of G be above the new surface at a distance eq?
- How would gravity be if the earth had the same mass but was hollow?
- How is gravity affected by distance and mass?
- How does the size/mass of the planets affect it's gravity?

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