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CAIE
6. Deformation of solids
6.1 Stress and strain
- understand that deformation is caused by tensile or compressive forces (forces and deformations will be assumed to be in one dimension only)
- understand and use the terms load, extension, compression and limit of proportionality
- recall and use Hooke’s law
- recall and use the formula for the spring constant k = F / x
- define and use the terms stress, strain and the Young modulus
- describe an experiment to determine the Young modulus of a metal in the form of a wire
6.2 Elastic and plastic behaviour
- understand and use the terms elastic deformation, plastic deformation and elastic limit
- understand that the area under the force–extension graph represents the work done
- determine the elastic potential energy of a material deformed within its limit of proportionality from the area under the force–extension graph
- recall and use EP = 1/2 Fx = 1/2 kx2 for a material deformed within its limit of proportionality