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
Magnetism and Electromagnetism
Fleming's left-hand rule, motors and loudspeakers
- 3 things to know
- Paper 2
Overview
The motor effect and the force on the magnet, Fleming's left-hand rule, the factors deciding the force on a conductor, the equation F = BIl with its units and calculations of force and magnetic flux density, why a current-carrying coil turns in an electric motor with a split-ring commutator, and how loudspeakers and headphones use the motor effect.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
In Fleming's left-hand rule, what does each of the first finger, the second finger and the thumb represent?
Key term
State the three factors that decide the size of the force on a current-carrying conductor in a magnetic field.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the motor effect?
Model answer
The effect in which a conductor carrying a current in a magnetic field and the magnet producing that field exert a force on each other.
- 2
A current-carrying wire between the poles of a magnet is pushed upwards. What force acts on the magnet?
Model answer
An equal force acts on the magnet in the opposite direction, because the wire and the magnet exert a force on each other.
- 3
Which hand is used for the rule that gives the relative directions of force, current and magnetic field for the motor effect?
Model answer
The left hand.
- 4
In Fleming's left-hand rule, what does each of the first finger, the second finger and the thumb represent?
Model answer
The first finger is the direction of the magnetic field, the second finger is the direction of the current and the thumb is the direction of the force, or motion.
- 5
How must the thumb and the two fingers be held for Fleming's left-hand rule to work?
Model answer
They must be held at right angles to one another.
- 6
State the three factors that decide the size of the force on a current-carrying conductor in a magnetic field.
Model answer
The magnetic flux density of the field, the size of the current and the length of conductor that is in the field.
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