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
Magnetism and Electromagnetism
Electromagnetism
- 3 things to know
- Physics Paper 2
Overview
The magnetic field around a current-carrying wire and what decides its strength, solenoids and why their field is stronger, the field inside and around a solenoid and which end is north, electromagnets with iron cores, showing that a current produces a magnetic field, and the field pattern around a straight wire and how its direction is reversed.
What you need to know
Answer each one before you reveal it.
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Key term
What is produced around a wire when a current flows through it?
Evaluation
What two things determine the strength of the magnetic field around a straight current-carrying wire?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is produced around a wire when a current flows through it?
Model answer
A magnetic field.
- 2
What two things determine the strength of the magnetic field around a straight current-carrying wire?
Model answer
The size of the current through the wire and the distance from the wire.
- 3
What happens to the magnetic field around a wire when the current through it is increased?
Model answer
The magnetic field becomes stronger.
- 4
What happens to the magnetic field around a wire when the current is switched off?
Model answer
The magnetic field disappears.
- 5
What is a solenoid?
Model answer
A length of wire wound into a coil of many turns.
- 6
Why is the field of a solenoid stronger than the field of the same wire held straight?
Model answer
Because the fields produced by all the separate turns add together.
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