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AQA PHYSICS UNIT 2 REVISION- MATERIALS
Density = mass per unit volume
=m/v. Units= kg/m³
You can measure the density of anunknown substance using methods involving the Eureka Tin, or
similar. Where the water displaced by the substance = volume of substance.
Hooke's law states that the force needed to stretch a material/spring is directly proportional to the
extension of that material/spring from its natural length.
i.e. a spring/material behaves with hooke's law until it's ELASTIC LIMIT is reached, from that point
onwards, the material will not return to its natural length.
The equation can be written as: F= k L (force applied = stiffness constant of spring x change
The energy stored in a stretched spring is equal
to the AREA under the graph. This energy is
elastic potential energy, and if the spring is
released the stored elastic energy is suddenly
converted into kinetic energy of the spring.
Elastic potential energy stored in a stretched
spring, E= FL
DEFORMATION OF SOLIDS
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The elasticity of a certain solid material is its ability to regain its
natural shape after being deformed.
Stress and Strain is another way of measuring how a material
deforms (what is more used in exams)
The Tensile Stress, = T / A. UNITS = Nm^-2/ Pa. This
measures tension per unit cross-sectional area. T is Tension (force
applied) and A is the cross-sectional area of the material.
The Tensile Strain, = L / L. This measures extension per
unit length.…read more