6. Deformation of solids
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6.1 Stress and strain
6.1.1Deformation is caused by tensile or compressive forces (forces and
• understand that deformation is caused by tensile or compressive forces (forces and deformations will be assumed to be in one dimension only)
6.1.2The terms load, extension, compression and limit of proportionality
• understand and use the terms load, extension, compression and limit of proportionality
6.1.3Hooke’s law
• recall and use Hooke’s law
6.1.4The formula for the spring constant k = F / x
• recall and use the formula for the spring constant k = F / x
6.1.5The terms stress, strain and the Young modulus
• define and use the terms stress, strain and the Young modulus
6.1.6The Young modulus of a metal in the form of a wire
• describe an experiment to determine the Young modulus of a metal in the form of a wire
6.2 Elastic and plastic behaviour
6.2.1The terms elastic deformation, plastic deformation and elastic limit
• understand and use the terms elastic deformation, plastic deformation and elastic limit
6.2.2The area under the force–extension graph represents the work done
• understand that the area under the force–extension graph represents the work done
6.2.3The elastic potential energy of a material deformed within its limit of
• determine the elastic potential energy of a material deformed within its limit of proportionality from the area under the force–extension graph
6.2.4EP = 1/2 Fx = 1/2 kx2 for a material deformed within its limit of
• recall and use EP = 1/2 Fx = 1/2 kx2 for a material deformed within its limit of proportionality