The Newton (symbol: N) is the SI derived unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics. SI derived units are part of the SI system of measurement units and are derived from the seven SI base units They are derived from SI basic units/defined In Physics, a force is whatever can cause an object with Mass to Accelerate. Sir Isaac Newton, FRS (ˈnjuːtən 4 January 1643 31 March 1727) Biography Early years See also Isaac Newton's early life and achievements Classical mechanics is used for describing the motion of Macroscopic objects from Projectiles to parts of Machinery, as well as Astronomical objects

Contents 1 Definition 2 Examples 3 Notes 4 References 5 See also

Definition

The Newton is the unit of force derived in the SI system; it is equal to the amount of force required to give a mass of one kilogram an acceleration of one meter per second squared . Algebraically:

Examples

• 1 N is the force of earth's gravity on an object with a mass of about 102 g (¹⁄_{9. 8} kg) (such as a small apple).
• On Earth's surface, a mass of 1 kg exerts a force of approximately 9. 81 N [down] (or 1 kgf). The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity The approximation of 1 kg corresponding to 10 N is sometimes used as a rule of thumb in everyday life and in engineering.
• The decaNewton (daN) = 10 N is increasingly used when specifying load bearing capacity of items such as ropes and anti-vibration mounts, being approximately equivalent to the more familiar non-SI unit of force, the kgf. The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity
• The force of Earth's gravity on a human being with a mass of 70 kg is approximately 687 N.
• The scalar product of force and distance is energy. In Mathematics, the dot product, also known as the scalar product, is an operation which takes two vectors over the Real numbers R In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός Thus, in SI units, a force of 1 N exerted over a distance of 1 m is 1 N·m = 1 joule, the SI unit of energy. The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity
• Because a Newton is a small force, it is common to see forces expressed in kiloNewtons or kN, where 1 kN = 1 000 N.
• A metric tonne (1 000 kg) exerts a force of 9. This article is about the tonne or metric ton For other tons see Ton. 8 kN (or 1 000 kgf) under standard gravity conditions on Earth. 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

Notes

Units of force

	newton (SI unit)	dyne	kilogram-force, kilopond	pound-force	poundal
1 N	≡ 1 kg·m/s²	= 105 dyn	≈ 0. 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 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

Three approaches to mass and force units

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

• Halliday, Resnick and Walker Fundamentals of Physics, John Wiley & Sons ISBN 0471470619

See also

• Joule, the SI unit of energy, equivalent to 1 newton exerted over a distance of 1 meter. 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 John Wiley & Sons Inc, also referred to as Wiley, is a global Publishing company that markets its products to professionals and consumers students and instructors The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός
• Pascal, the SI unit of pressure, equivalent to 1 newton acting on an area of 1 square meter. Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface M^2 redirects here For other uses see M². CM2 redirects here
• Kilogram-force, the force exerted by Earth's gravity on one kilogram of mass. The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity

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