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
The speed of sound, and the distance-speed-time equation
- 2 things to know
- Paper 2
Overview
A typical speed of sound in air, measuring speed from distance and time, the equation s = v t in words and symbols with its units and calculations, rearranging it for time, and calculating average speed for journeys in which the speed keeps changing.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Numbers
A cyclist rides at a constant 6 m/s for 40 s. Calculate the distance travelled.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State a typical value for the speed of sound in air.
Model answer
About 330 m/s.
- 2
Roughly how far does a sound travel through air in 3 seconds?
Model answer
About 990 m, because sound travels at roughly 330 m/s in air.
- 3
Which two measurements must be taken in order to calculate the speed of a moving object?
Model answer
The distance the object moves and the time it takes to move that distance.
- 4
Describe how you could measure the speed of a person walking along a corridor.
Model answer
Measure a fixed length of corridor with a tape measure, time the person walking it with a stopwatch, then divide the distance by the time.
- 5
For an object moving at a constant speed, what two quantities decide how far it travels?
Model answer
Its speed and the time for which it travels.
- 6
A cyclist rides at a constant 6 m/s for 40 s. Calculate the distance travelled.
Model answer
The distance is 240 m, from 6 m/s × 40 s.
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