Interactive Syllabus Extract for

Section 3.4.2 - Materials

3.4.2.1 Bulk properties of solids	Density
Stretching solids	Hooke's law	elastic limit, investigations.	k as stiffness and spring constant.
	Tensile strain and tensile stress. Elastic strain energy Breaking stress.	Derivation of stored energy Description of plastic behaviour, fracture and brittleness linked to force–extension graphs.	= area under force−extension graph
	Interpretation of simple stress-strain curves.	Appreciation of energy conservation issues in the context of ethical transport design.	Quantitative and qualitative application of energy conservation to examples involving elastic strain energy and energy to deform. Spring energy transformed to kinetic and gravitational potential energy.
3.4.2.2 The Young Modulus	Use of stress-strain graphs to find the Young modulus.	One simple method of measurement.	Required practical 4: Determination of the Young modulus by a simple method.