Key term
AQA GCSE Physics 8463
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 contaminationBackground radiationUses of nuclear radiation, and how half-life affects hazardNuclear fission and nuclear fusion
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 GridStatic chargeElectric fields
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 springMoments, levers and gearsPressure at a surface, and the equation p = F over APressure in a column of liquid, upthrust and floatingAtmospheric pressureResolving 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 conservationChanges in momentum
Magnetism and Electromagnetism
Topic overviewPoles of a magnetMagnetic fields around a magnetThe compass, and plotting a magnetic fieldElectromagnetismFleming's left-hand rule, motors and loudspeakersInduced potentialThe generator effect, alternators, dynamos and microphonesThe structure of a transformer and the turns ratioTransformer power, and using the transformer equations
Particle Model of Matter
Space Physics
Waves
Topic overviewTransverse and longitudinal waves, and the wave equationWave properties, and refraction at a boundaryReflection of wavesSound wavesUltrasound, echo sounding and seismic wavesTypes and uses of electromagnetic wavesRadio waves, and the hazards of ultraviolet, X-rays and gamma raysLensesVisible lightEmission and absorption of infrared radiation, and black bodies
Forces
Pressure in a column of liquid, upthrust and floating
- 2 things to know
- Paper 2
Overview
The quantities and equation for pressure due to a column of liquid, why pressure rises with depth and density, what upthrust is, and why objects float or sink.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
State the equation for the pressure due to a column of liquid, in words.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which three quantities are needed to calculate the pressure due to a column of liquid?
Model answer
The height of the column, the density of the liquid and the gravitational field strength.
- 2
State the equation for the pressure due to a column of liquid, in words.
Model answer
Pressure = height of the column × density of the liquid × gravitational field strength.
- 3
Calculate the pressure due to a 3.0 m column of water of density 1000 kg/m³ where the gravitational field strength is 9.8 N/kg.
Model answer
Pressure = 3.0 × 1000 × 9.8 = 29 400 Pa.
- 4
Write the equation for the pressure due to a column of liquid using symbols.
Model answer
p = hρg, where h is the height of the column, ρ is the density of the liquid and g is the gravitational field strength.
- 5
The pressure due to a column of water of density 1000 kg/m³ is 19 600 Pa. Calculate its height, taking the gravitational field strength as 9.8 N/kg.
Model answer
Height = 19 600 ÷ (1000 × 9.8) = 2.0 m.
- 6
In what unit is the pressure due to a column of liquid measured?
Model answer
It is measured in pascals, Pa.
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