Newton

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The newton (symbol: N) is the International System of Units SI derived unit of force (physics), named after Sir Isaac Newton in recognition of his work on classical mechanics.

Definition A newton is the amount of force required to acceleration a body with a mass of one kilogram at a rate of one meter per second squared. Algebraically: {\rm 1~N = 1~\frac{kg\cdot m}{s^2-->.

Examples

1 N is the force of Earth's gravity on an apple with a mass of about 102 g ( kg).
On Earth's surface, a mass of 1 kg exerts a force of approximately 9.81 N (or 1 kilogram-force) on its support. The approximation of 1 kg corresponding to 10 N is sometimes used as a rule of thumb in everyday life and in engineering (except where strict accuracy is required).
The force of Earth's gravity on a human being with a mass of 70 kg is approximately 686 N.
The scalar product of force and distance (N×m)— a force of 1 N carried out over a distance of 1 m— is one joule, the basic unit of energy in the SI.
Because a newton is a relatively small amount of force, it is common to see forces expressed in kilonewtons or kN, where 1 kN = 1000 N.
A metric tonne (1000 kg) exerts a force of 9.8 kN (or 1000 kgf) under standard gravity conditions on Earth.

Conversions

See also

Joule, a unit of energy defined by a force of 1 newton being carried out over 1 metre.
Pascal (unit) a unit of pressure defined by 1 newton spread across 1 square metre.

References

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Isaac Newton (1643-1727) ... Isaac Newton was the greatest English mathematician of his generation. He laid the foundation for differential and integral calculus.

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