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
Poles of a magnet
- 3 things to know
- Physics Paper 2
Overview
Where magnetic forces are strongest, attraction and repulsion between poles as a non-contact force felt by both magnets, permanent and induced magnets, why induced magnetism always attracts and is lost outside the field, and testing whether a steel bar is a permanent magnet.
What you need to know
Answer each one before you reveal it.
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Key term
State the general rule for the force between two magnetic poles brought close together.
Key term
What is a permanent magnet?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Where on a magnet are the magnetic forces strongest?
Model answer
At the poles of the magnet.
- 2
State the general rule for the force between two magnetic poles brought close together.
Model answer
Two like poles repel each other and two unlike poles attract each other.
- 3
The north pole of one bar magnet is held close to the north pole of another. Describe the force between them.
Model answer
They push apart, because two like poles repel each other.
- 4
Why is the attraction between two magnetic poles described as a non-contact force?
Model answer
Because each magnet exerts the force on the other without the two touching.
- 5
When two magnets are brought close together, does only one of them feel a force?
Model answer
No, the two magnets exert a force on each other, so both feel a force.
- 6
What is a permanent magnet?
Model answer
A magnet that produces its own magnetic field all the time.
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