Practise Edexcel A-Level Physics force-extension and force-compression graphs through proportional regions, elastic limits, yield points and plastic deformation.
A student carried out an experiment to determine the Young modulus of a sample of stainless steel in the form of a wire. The student added weights to the wire and measured the corresponding extensions.
The wire had an unstretched length of 2.6 m . The diameter of the wire was 5.6×10−4 m.
The student plotted a graph of weight against extension. The graph showed that the limit of proportionality was not exceeded.
State what is meant by the limit of proportionality.
Maximum value of weight/force for which weight/force is proportional to extension
Or
Point beyond which Hooke's Law no longer applies
Or
Point beyond which graph line ceases to be straight
Or
Point beyond which weight/force is no longer proportional to extension
(1)