Why objects return to shape—and the precise point they don't
In short: This video explains the physics of elasticity, breaking down how materials respond to stress. You will learn to distinguish between temporary stretching and permanent deformation, while mastering the mathematical relationship between force and extension.
The core of elasticity lies in Hooke's Law, which states that the extension of an object is directly proportional to the force applied to it. This relationship is expressed by the equation F=ke, where 'k' represents the spring constant—a measure of the object's stiffness. By analyzing force-extension graphs, you can identify the linear region where this proportionality holds true.
Crucially, materials have an 'elastic limit,' also known as the limit of proportionality. Beyond this threshold, deformation becomes inelastic or plastic, meaning the object will no longer return to its original shape. Understanding these boundaries is essential for predicting how structures and components behave under pressure.
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Sources
- Summary by Intellect · source: GCSE Physics - Elasticity, Spring Constant & Hooke's Law | Force Extension Graphs (2027/28 exams)
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