The unit kilogram-force (kgf, often just kg) or kilopond (kp) is defined as the force exerted by Earth's gravity on one kilogram of mass. In Physics, a force is whatever can cause an object with Mass to Accelerate. Earth's gravity, denoted by g, refers to the Gravitational attraction that the Earth exerts on objects on or near its surface Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object Although the gravitational pull of the Earth varies as a function of position on earth, it is here defined as exactly 9. 80665 m/s². So one kilogram-force is by definition equal to 9. 80665 newtons. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical [1]
The kilogram-force has never been a part of the International System of Units (SI), which was introduced in 1960. The SI unit of force is the newton. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical
Prior to this, the unit was widely used in much of the world; it is still in use for some purposes. The thrust of a rocket engine, for example, was measured in kilograms-force in 1940s Germany, in the Soviet Union (where it remained the primary unit for thrust in the Russian space program until at least the late 1980s), and it is still used today in China and sometimes by the European Space Agency.
It is also used for tension of bicycle spokes, for torque measured in "meter-kilograms", for pressure in kilograms per square centimeter, for the draw weight of bows in archery, and to define the "metric horsepower" (PS) as 75 m·kgf/s. A spoke is one of some number of rods radiating from the center of a Wheel (the hub where the Axle connects connecting the hub with the round traction surface A torque (τ in Physics, also called a moment (of force is a pseudo- vector that measures the tendency of a force to rotate an object about [1]
Grams-force and kilograms-force were never well-defined units until the CGPM adopted a standard acceleration of gravity of 980. The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures ( CGPM, never GCWM 665 cm/s² for this purpose in 1901, though they had been used in low-precision measurements of force before that time.
A tonne-force, metric ton-force, megagram-force, or megapond (Mp) is 1000 kilograms-force.
The decanewton (daN) is used in some fields as an approximation to the kilogram-force, being exactly rather than approximately 10 newtons.
| newton (SI unit) |
dyne | kilogram-force, kilopond |
pound-force | poundal | |
|---|---|---|---|---|---|
| 1 N | ≡ 1 kg·m/s² | = 105 dyn | ≈ 0. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical This article deals with the unit of force For the unit of mass see Pound (mass. The poundal is a non- SI unit of Force. It is a part of the Foot-pound-second system of units a coherent subsystem of English units introduced 10197 kp | ≈ 0. 22481 lbf | ≈ 7. 2330 pdl |
| 1 dyn | = 10−5 N | ≡ 1 g·cm/s² | ≈ 1. 0197×10−6 kp | ≈ 2. 2481×10−6 lbf | ≈ 7. 2330×10−5 pdl |
| 1 kp | = 9. 80665 N | = 980665 dyn | ≡ gn·(1 kg) | ≈ 2. 2046 lbf | ≈ 70. 932 pdl |
| 1 lbf | ≈ 4. 448222 N | ≈ 444822 dyn | ≈ 0. 45359 kp | ≡ gn·(1 lb) | ≈ 32. The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass 174 pdl |
| 1 pdl | ≈ 0. 138255 N | ≈ 13825 dyn | ≈ 0. 014098 kp | ≈ 0. 031081 lbf | ≡ 1 lb·ft/s² |
| The value of gn as used in the official definition of the kilogram-force is used here for all gravitational units. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit Standard gravity, usually denoted by g 0 or g n is the nominal acceleration due to gravity at the Earth's surface at sea level | |||||
| System | Gravitational | Engineering | Absolute | |||
|---|---|---|---|---|---|---|
| Force (F) | F = m·a | F = m·a/gc = w·a/g | F = m·a | |||
| Weight (w) | w = m·g | w = m·g/gc ≈ m | w = m·g | |||
| Units | English | Metric | English | Metric | English | Metric |
| Acceleration (a) | ft/s2 | m/s2 | ft/s2 | m/s2 | ft/s2 | m/s2 |
| Mass (m) | slug | hyl | pound-mass | kilogram | pound | kilogram |
| Force (F) | pound | kilopond | pound-force | kilopond | poundal | newton |
References
- ^ a b Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 1995 p. Newton's laws of motion are three Physical laws which provide relationships between the Forces acting on a body and the motion of the The slug is an English unit of Mass. It is a mass that accelerates by 1 ft/s² when a force of one Pound-force (lbf is exerted on it In the gravitational metric system(s the base unit of force is not normalised to one mass unit ( Gram or Kilogram) times one length unit ( Metre or centimetre The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity This article deals with the unit of force For the unit of mass see Pound (mass. The poundal is a non- SI unit of Force. It is a part of the Foot-pound-second system of units a coherent subsystem of English units introduced The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical 51 [1]
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