A-level Physics/Forces and Motion/Deformation of solids

From Wikibooks, open books for an open world
Jump to: navigation, search

Hooke's law[edit]

This applies to an object's deformation only before the elastic limit; from then on it deforms plastically and no longer follows this law. it states that,extention is directly propotional to the applied force.

Spring Constant[edit]




The gradient refers to the gradient of a Tension-Extension graph.
The standard units of k are N m-1

Strain[edit]


Because this is a division of two measurements of length, Strain has no units and remains a ratio.

Stress[edit]


The units for Stress are N m-2, otherwise known as Pascals (Pa)

The Young's modulus[edit]

Strain energy[edit]

However, due to Hooke's Law, it can be calculated in another form, y=mx+c;