A-Level Physics Specification

OCR A H556

Section 3.4.2: Mechanical properties of matter

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#3.4.2a

force–extension (or compression) graph; work done is area under graph

#3.4.2b

elastic potential energy;
\(E = \dfrac{1}{2}Fx \); \(E = \dfrac{1}{2}kx^2 \)

#3.4.2c

stress, strain and ultimate tensile strength

#3.4.2d

(i) \(\text{Young modulus} = \dfrac{\text{tensile stress}}{\text{tensile strain}} \),
\(E = \dfrac{σ}{ε}\)

(ii) techniques and procedures used to determine the Young modulus for a metal

PAG2

#3.4.2e

stress–strain graphs for typical ductile, brittle and polymeric materials

#3.4.2f

elastic and plastic deformations of materials.

PAG2