Standard gravity, usually denoted by g0 or gn, is the nominal acceleration due to gravity at the Earth's surface at sea level. Earth's gravity, denoted by g, refers to the Gravitational attraction that the Earth exerts on objects on or near its surface By definition it is equal to exactly 9. 80665 m/s2 (approx. 32. 174 ft/s2). [1] This value was established by the 3rd CGPM (1901, CR 70). The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures ( CGPM, never GCWM
The symbol g is sometimes also used for standard gravity, but g strictly means the local acceleration due to gravity, which varies depending on one's position on Earth. The symbol g should not be confused with G, the gravitational constant, or g, the abbreviation for gram (which is not italicized). The gravitational constant, denoted G, is a Physical constant involved in the calculation of the gravitational attraction between objects with mass The g (sometimes written "gee") is also used as a unit of acceleration, with the value defined as above; see g-force. g-force (also G-force, g-load) is a measurement of an object's Acceleration expressed in g s
The value of g0 defined above is an arbitrary midrange value on Earth, approximately equal to the acceleration of a body in free fall (in the absence of air resistance) at sea level at a geodetic latitude of about 45. Latitude, usually denoted symbolically by the Greek letter phi ( Φ) gives the location of a place on Earth (or other planetary body north or south of the 5°. It is larger in magnitude than the average sea level acceleration on Earth, which is about 9. 797 645 m/s2. Although the actual strength of gravity on Earth varies according to location (see Earth's gravity), for weights and measures and many calculation purposes the standard gravity figure is used. Earth's gravity, denoted by g, refers to the Gravitational attraction that the Earth exerts on objects on or near its surface
The SI unit of acceleration due to gravity (or, indeed, any acceleration), namely metre per square second, can also be written as newton per kilogram. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical The value stays the same: gn = 9. 80665 N/kg. This alternative representation for the same unit may be more intuitive when considering problems involving pressure due to gravity, or weight. Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface In the Physical sciences weight is a Measurement of the gravitational Force acting on an object For example, at sea level the gravitational force between the Earth and a mass of 1 kilogram is 9. 80665 newtons.
References
- ^ The notation m/s2 means meters per second per second, and the notation ft/s2 means feet per second per second.
See also
- Earth's gravity
- g-force, a measure of apparent acceleration
- G, the gravitational constant in Newton's law of gravity
- Gravitational acceleration
External links
- http://physics.nist.gov/Document/sp330.pdf#page=39
- http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf#page=51 (pg. Earth's gravity, denoted by g, refers to the Gravitational attraction that the Earth exerts on objects on or near its surface g-force (also G-force, g-load) is a measurement of an object's Acceleration expressed in g s The gravitational constant, denoted G, is a Physical constant involved in the calculation of the gravitational attraction between objects with mass Gravitation is a natural Phenomenon by which objects with Mass attract one another In Physics, gravitational acceleration is the Acceleration of an object caused by the Force of gravity from another object 51 in pdf)
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