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The newton (symbol: N) is the SI unit of force. It is named after Sir Isaac Newton in recognition of his work on classical mechanics.

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Contents 1 Definition 2 SI multiples 3 Explanation 4 Conversions 5 See also

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Definition

A newton is the amount of force required to accelerate a mass of one kilogram at a rate of one metre per second squared.

1 N = 1 kg·m·s^–2

SI multiples

Multiple	Name	Symbol		Multiple	Name	Symbol
100	newton	N
101	decanewton	daN		10–1	decinewton	dN
102	hectonewton	hN		10–2	centinewton	cN
103	kilonewton	kN		10–3	millinewton	mN
106	meganewton	MN		10–6	micronewton	µN
109	giganewton	GN		10–9	nanonewton	nN
1012	teranewton	TN		10–12	piconewton	pN
1015	petanewton	PN		10–15	femtonewton	fN
1018	exanewton	EN		10–18	attonewton	aN
1021	zettanewton	ZN		10–21	zeptonewton	zN
1024	yottanewton	YN		10–24	yoctonewton	yN

Explanation

The notions of mass and force are often confused in everyday life, but must be kept separate in science and engineering. The newton was first used around 1904, but not until 1948 was it officially adopted by the General Conference on Weights and Measures (CGPM) as the name for the MKS unit of force. Rather fittingly, given the story about how Newton arrived at his theory of gravity after contemplating why an apple falls downwards, the mass of a small apple exerts a force of about 1 newton on Earth.

Conversions

Units of force

	Newton (SI unit)	Dyne	Kilopond (kilogram-force)	Pound-force	Poundal
1 N	= 1 kg·m/s²	= 105 dyn	≈ 0.10197 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)	≈ 32.174 pdl
1 pdl	≈ 0.138255 N	≈ 13825 dyn	≈ 0.014098 kp	≈ 0.031081 lbf	= 1 lb·ft/s²
The values for the pound-force are calculated using the same value for the standard acceleration of gravity gn which is official for defining the kilopond (a.k.a. kilogram-force), something which is not required. Other values such as gn = 32.16 ft/s² are also used.

See also

• Isaac Newton
• SI
• dyne, the unit of force of the (mostly obsolete) CGS system, equal to 10 µN.
• kilogram-force

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