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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 (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation). It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the … 展开
A non-rotating perfect sphere of uniform mass density, or whose density varies solely with distance from the centre (spherical symmetry), would produce a gravitational field of uniform magnitude at all points on its 展开
Gravity acceleration is a vector quantity, with direction in addition to magnitude. In a spherically symmetric Earth, gravity would point directly towards the sphere's centre. As the Earth's figure is … 展开
Tools exist for calculating the strength of gravity at various cities around the world. The effect of latitude can be clearly seen with gravity in high-latitude cities: Anchorage (9.826 m/s ), Helsinki (9.825 m/s ), being about 0.5% greater than that in cities near the … 展开
If the terrain is at sea level, we can estimate, for the Geodetic Reference System 1980, $${\displaystyle g\{\phi \}}$$, the acceleration at latitude $${\displaystyle \phi }$$:
This is the 展开From the law of universal gravitation, the force on a body acted upon by Earth's gravitational force is given by
$${\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}=\left(G{\frac {M_{\oplus }}{r^{2}}}\right)m}$$
where r is the distance … 展开The measurement of Earth's gravity is called gravimetry.
Satellite measurements 展开• Earth sciences portal
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网页2024年9月13日 · Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity …
Gravity | Definition, Physics, & Facts | Britannica
网页2024年9月11日 · On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth’s mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling …
What is gravity? | Space
网页2023年7月30日 · Learn about the universal force of gravity that acts on everything with mass, from apples to galaxies. Find out how Newton and Einstein described gravity, and how it shapes the cosmos.
How Strong is the Force of Gravity on Earth? - Universe …
网页2016年12月6日 · Learn how gravity is a natural phenomenon that affects all objects with mass, and how Earth's gravity is influenced by its rotation, density and location. Find out how to measure Earth's...
What is Gravity? How is Gravitational Field Measured from Space?
网页Learn what gravity is, how it varies on Earth, and how it is measured from space by satellites. Find out how gravity data can help scientists study the Earth's climate, ocean …
What is gravity? - HowStuffWorks
网页2023年11月30日 · Gravity is a fundamental force that attracts any two objects with mass. Learn how gravity works on Earth and in the universe, from Newton's theory to Einstein's relativity to quantum …
Gravity - Wikipedia
网页Gravity is a fundamental interaction that causes mutual attraction between all things that have mass. Learn about the history of gravity, from ancient theories to modern physics, and how it affects the motion of objects …
Gravity: A simple introduction - Explain that Stuff
网页2022年1月6日 · Gravity is a pulling force between every object in the universe and every other object. Learn how gravity works on Earth and in space, and how it varies with distance, latitude and altitude.
What is gravity? - New Scientist
网页Gravity is the force that tells massive objects how to move, and the property of the universe that determines its shape and evolution. Learn about Newton's and...
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