School of Physics Lecture Demonstration Manual

Mm-4 Hooke's Law

Published: Thursday 09 March 2006 - Updated: Thursday 24 March 2011

Aim

To demonstrate Hooke's Law. and elastic and deformation properties of springs.

Apparatus

Diagrams

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Hooke's Law Diagram

Hooke's Law Apparatus

Hooke's Law Spring Deformed

Videos

Hooke's Law Demonstration

Hooke's Law Spring Deformation

Description

With the spring held in the pin vice on the stand, weights are added in steps of 1 kg. The greater the weight added, the greater the extension of the spring and the relation between them should be linear in nature according to Hooke's Law. Releasing the weights should see a return to the original extension. When this is occurring the spring is displaying elastic deformation. If enough weight is added to the spring, it will deform permanently and lose its elasticity. This is known as plastic deformation. It is interesting to note that if the experiment is repeated with rubber bands, Hooke's Law is not followed. Rubber is extremely nonlinear in its Stress-Strain characteristics.

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