Introduction
 

Young's modulus is a measure of a material's stiffness and describes how resistant it is to elastic deformation when a force is applied. It is defined as the ratio of tensile stress to tensile strain within the limit of proportionality. Understanding Young's modulus allows students to compare the mechanical properties of different materials and is widely applied in engineering, construction and materials science.
 

AQA A Level Physics Specification: 3.4.3.2 Young Modulus
 

What You Need to Know
 

• Define Young's modulus as the ratio of tensile stress to tensile strain.

• State the unit of Young's modulus (pascal, Pa).

• Understand that a larger Young's modulus indicates a stiffer material.

• Calculate Young's modulus using tensile stress and tensile strain.

• Apply Young's modulus to determine the extension of wires and other materials.

• Recognise that Young's modulus applies only within the limit of proportionality.

• Compare the stiffness of different materials using their Young's modulus values.

• Solve quantitative problems involving stress, strain and Young's modulus.
   

Downloadable Topic Pack
 

Young's Modulus Topic Pack Exam Questions and Answers
 

Related Topics
 

• Stress and Strain

• Hooke's Law

• Density

• Forces

• Mechanical Properties of Materials