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 AAtmospheric pressureDistance, 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 quickly
Magnetism and Electromagnetism
Particle Model of Matter
Space Physics
Waves
Topic overviewTransverse and longitudinal waves, and the wave equationWave properties, and refraction at a boundaryReflection of 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
Atmospheric pressure
- 3 things to know
- Paper 2
Overview
The atmosphere and how its density falls with altitude, what causes atmospheric pressure and why it decreases with height, pressurised aircraft cabins, a simple model of the atmosphere, a sealed bottle crushed on the way down a mountain, and why a suction cup stays on a window.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What causes atmospheric pressure on a surface?
Key term
Explain why aircraft cabins have to be pressurised when flying at high altitude.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe what the atmosphere is.
Model answer
It is a layer of air around the Earth that is thin compared with the size of the Earth itself.
- 2
How does the density of the atmosphere change with increasing altitude?
Model answer
It gets less dense as altitude increases.
- 3
Where in the atmosphere is the air most dense?
Model answer
Closest to the surface of the Earth.
- 4
What causes atmospheric pressure on a surface?
Model answer
Air molecules colliding with that surface.
- 5
How does the weight of air above a surface change as the surface is raised higher above the ground?
Model answer
It decreases, because there are fewer air molecules above the surface.
- 6
Explain why aircraft cabins have to be pressurised when flying at high altitude.
Model answer
Atmospheric pressure at that height is too low for passengers to breathe comfortably.
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