Gravity of Earth
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The gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation and the centrifugal force .
It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the norm .
Earth's gravity measured by NASA GRACE mission, showing deviations from the theoretical gravity of an idealized, smooth Earth, the so-called Earth ellipsoid. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker (Animated version).
Earth's radial density distribution according to the Preliminary Reference Earth Model (PREM).
A plumb bob determines the local vertical direction
Gravity
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In physics, gravity (from Latin gravitas 'weight') is a fundamental interaction which causes mutual attraction between all things that have mass. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.
The shape of two massive galaxies in the picture are distorted due to gravity.
The Leaning Tower of Pisa, where according to legend Galileo performed an experiment about the speed of falling objects
English physicist and mathematician, Sir Isaac Newton (1642–1727)
An illustration of the Schwarzschild metric, which describes spacetime around a spherical, uncharged, and nonrotating object with mass