Key term
AQA GCSE Combined Science Physics 8464
Atomic Structure
Topic overviewThe structure of an atomMass number, atomic number and isotopesFrom the plum pudding model to the nuclear modelChadwick, the neutron, and comparing the modelsRadioactive decay and nuclear radiationNuclear equationsHalf-lives and the random nature of radioactive decayRadioactive contamination
Electricity
Topic overviewCircuit symbols, electrical charge and currentCurrent, resistance and potential differenceOhmic conductors, filament lamps, diodes and thermistorsLight-dependent resistors, and investigating resistanceCurrent and potential difference in series and parallelConstructing circuits, and calculating in series circuitsDirect and alternating potential difference, and mains electricityPower and efficiencyAppliances, and the energy transferred by electrical workPower, and the power ratings of domestic appliancesThe National Grid
Energy
Forces
Topic overviewScalars, vectors, forces and the resultant forceGravityWork done and energy transferStretching, compressing, and the spring constantLinear and non-linear extension, and work done on a springResolving forces and free body diagramsDistance, displacement and speedThe speed of sound, and the distance-speed-time equationVelocity and the distance-time relationshipAcceleration, deceleration and velocity-time graphsArea under a velocity-time graph, and the uniform acceleration equationNewton's First LawNewton's Second and Third LawsStopping distance and reaction timeFactors affecting braking distanceBraking force, deceleration and the dangers of stopping quicklyMomentum and its conservation
Magnetism and Electromagnetism
Particle Model of Matter
Particle Model of Matter
Density of materials
- 3 things to know
- Physics Paper 1
Overview
Density and the equation linking density, mass and volume with its rearrangements, units and calculations, the particle model of solids, liquids and gases and why a gas is less dense, and practical methods for finding the volume and density of regular and irregular solids and of liquids.
What you need to know
Answer each one before you reveal it.
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Key term
Rearrange the density equation to make mass the subject.
Key term
Rearrange the density equation to make volume the subject.
Questions from this subtopic
Each one with the model answer underneath.
- 1
In words, what does the density of a material tell you?
Model answer
It tells you how much mass is contained in a given volume of the material.
- 2
State the equation that links density, mass and volume.
Model answer
Density = mass ÷ volume, written ρ = m/V.
- 3
Rearrange the density equation to make mass the subject.
Model answer
Mass = density × volume, written m = ρV.
- 4
Rearrange the density equation to make volume the subject.
Model answer
Volume = mass ÷ density, written V = m/ρ.
- 5
What symbol is used for density, and in what unit is it measured?
Model answer
Density is given the symbol ρ and is measured in kilograms per metre cubed, kg/m³.
- 6
In what unit must mass be given when using the density equation?
Model answer
Mass must be in kilograms, kg.
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