BRAINCAKE

Materials

AQA AS-level PhysicsTopic 12 of 1418 lessons

Revision notes for Materials in AQA Physics (7407). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. DensityThe density of a solid, liquid or gas is the mass per unit volume of the substance.
  2. Measuring DensityDensity is mass per unit volume, ρ = m/V, measured in kg m-3 or g cm-3.
  3. The Density of AlloysThe density of alloys can be calculated by adding the masses of each individual metal to get the total mass and adding the volumes of each…
  4. Hooke's LawHooke's Law states that the force needed to stretch a spring is directly proportional to the extension of the spring up to the limit of…
  5. Springs in ParallelWhen two springs are placed in parallel the effective spring constant is the sum of the two spring constants.
  6. Springs in SeriesWhen two springs are placed in series the total extension is the sum of the individual extensions of each spring. ΔLP = W kP ΔLQ = W kQ ΔLP + ΔLQ =…
  7. The Energy Stored in a Stretched SpringWork must be done to stretch a spring.
  8. Tensile and Compressive ForcesTensile forces and compressive forces cause the deformation of solids.
  9. Tensile StressTensile stress σ is given by: σ = T/A where T is the load and A is the cross-sectional area.
  10. Tensile StrainTensile strain ε is the extension over the original length. ε = ΔL/L Where ΔL is the extension and L is the original length.
  11. Young ModulusThe Young modulus E of a material is its tensile stress divided by its tensile strain, E = σ/ε.
  12. Stress-Strain Graph for Metal WireStress-Strain Graph for a metal wire P limit of proportionality E elastic limit Y1 yield point (weakens temporarily) yield point small increases in…
  13. DefinitionsPlastic Deformation Material no longer returns to original length when force is removed.
  14. Other Stress-Strain CurvesSteel is ductile and has a high tensile strength.
  15. Loading and UnloadingLoading and Unloading a Metal Wire The loading and unloading line is the same provided the elastic limit is not exceeded.
  16. Strain EnergyWhen a material is stretched, the work done on it is stored as elastic strain energy.
  17. PolythenePolythene is a polymer that does not obey Hooke's law.
  18. RubberRubber is an elastic polymer that can be stretched to several times its original length and still return to that length when the load is removed.

On the specification

All AQA AS-level Physics topics