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6 Deformation of solids
6.1 Stress and strain
Candidates should be able to:
1 understand that deformation is caused by tensile or compressive forces (forces and deformations will
be assumed to be in one dimension only)
2 understand and use the terms load, extension, compression and limit of proportionality
3 recall and use Hooke’s law
4 recall and use the formula for the spring constant k = F/ x
5 define and use the terms stress, strain and the Young modulus
6 describe an experiment to determine the Young modulus of a metal in the form of a wire
6.2 Elastic and plastic behaviour
Candidates should be able to:
1 understand and use the terms elastic deformation, plastic deformation and elastic limit
2 understand that the area under the force–extension graph represents the work done
3 determine the elastic potential energy of a material deformed within its limit of propo
