Module 3:

Section 3.4 Materials

3.4.1 Springs	(a) tensile and compressive deformation; extension and compression
	(b) Hooke's law
	(c) force constant k of a spring or wire; F = kx
	(d) (i) force–extension (or compression) graphs for springs and wires
	(d) (ii) techniques and procedures used to investigate force–extension characteristics for arrangements which may include springs, rubber bands, polythene strips.
3.4.2 Mechanical properties of matter	(a) force–extension (or compression) graph; work done is area under graph
	(b) elastic potential energy; E = ½Fx E = ½kx²
	(c) stress, strain and ultimate tensile strength
	(d) (i) Young modulus = tensile stress/tensile strain E = σ/ε (ii) techniques and procedures used to determine the Young modulus for a metal
	(e) stress–strain graphs for typical ductile, brittle and polymeric materials
	(f) elastic and plastic deformations of materials.