Introduction Stiffness vs. strength Experiment  step 1 Experiment  step 2 Experiment  step 3 Graph Calculation Questions
 
By Bill Mitchell & Andrew Green
The Young Modulus, E
is a material property that describes its stiffness and is therefore one of the most
important properties in engineering design.
Learning outcomes
After completing this section, you should be able to:
 provide a definition of the Young modulus and give its units; 
 explain the terms tensile force, tensile stress, tensile strain, elastic, strong and
stiff; 
 differentiate between the terms strength and stiffness; 
 determine the Young modulus experimentally by;
 describing the apparatus; 
 measuring the key dimensions of the test wire; 
 using a vernier scale to measure the extension of the wire; 
 generating a straightline graph of extension vs. mass; 
 evaluating the gradient of the graph; and 
 calculating the Young modulus by substitution into formulae. 

Assumed prior knowledge
It is assumed that you have knowledge of the following concepts:
 force and its SI unit, the Newton (N); and 
 the ability to read a vernier scale. 
