# Force exerted by stretched or contracted material

## Description

In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other. . Any strain (deformation) of a solid material generates an internal elastic stress, analogous to the reaction force of a spring, that tends to restore the material to its original non-deformed state. The force exerted by a material when contracted or stretched is related to the amount by which the length of the object changes, the original cross-sectional area through which the force is applied and the original length of the object.

Related formulas## Variables

F | Force exerted by stretched (N) |

E | Modulus of elasticity ( Young's modulus) (Pa) |

A_{0} | The original cross-sectional area through which the force is applied (m^{2}) |

d_{L} | The amount by which the length of the object changes (m) |

L_{0} | The original length of the object (m) |