Loading…
Loading…
GCSE Physics · key term
A permanent deformation: the object does not return fully to its original shape and dimensions when the forces causing the deformation are removed.
Used by OCR
Specification P2.3b · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Elastic and plastic deformationIn plastic deformation, the object does not return fully to its original shape or length after the stretching force is removed. It has a permanent or irreversible deformation. This is also sometimes called inelastic deformation.
Paper 1, Paper 2
Permanent deformation: the object does not return completely to its original shape and size when the forces are removed.
When comparing elastic and plastic deformation, always describe what happens after the stretching force is removed.
An elastic band is named after its usual behaviour, but it can still undergo plastic deformation if it is stretched too far.
Do not use “plastic deformation” to mean deformation of a plastic material. It means a permanent deformation and can occur in many materials.
Create a free account to read GCSE Physics revision notes for your exam board and track your progress.
The object stays longer or distorted after the forces are removed: this is plastic deformation. A spring stretched too far may behave this way. The same object can therefore deform elastically under a smaller pull and plastically under a larger one.