# Newton

### From DT Online

The **newton** *(symbol: N)* is the

**International System of Units (SI)**unit of

**force**. It is named after

**Isaac Newton**

**Note:**
* Units named after people* use capital letters for the letter symbol - but not for the unit name itself.

- A
**newton**is defined as the force needed to accelerate one kilogram of mass at the rate of one metre per second squared - i.e.**kg**x**m**x**s**^{−2} - A
**newton**applied at the end of a metre long**lever**will exert a turning force,**Torque**or**Moment of Force**of a**newton metre***(*- this is the same as the derivation of a**N**x**m**)**joule**,*(symbol:*, named after**J**)**James Prescott Joule**and used to measure energy, work, heat - but**joules**are not used for**Torque**. - A
**newton**applied over a square metre*(i.e.*is used to measure**N/m**)^{2}**Stress**,**Young's Modulus**,**U.T.S.**or**pressure**and derives the**S.I. Unit**of**pascal***(symbol:*, named after**Pa**)**Blaise Pascal**.