The extension of an elastic object, such as a spring, is described by Hooke's law.
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Forces may change the shape of an object.
An object, such as a spring, stores elastic potential energycloseelastic potential energyEnergy stored in squashed, stretched or twisted materials. when stretched or squashed.
When an object, such as a spring, is stretched, the increased length is called its extension.
The equation for Hooke鈥檚 Law is:
F = ke