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
Stretching, compressing, and the spring constant
- 3 things to know
- Paper 2
Overview
The forces that stretch, compress and bend objects, elastic and inelastic deformation, extension proportional to force up to the limit of proportionality, the equation linking force, spring constant and extension with its units, compressing rather than stretching, and the elastic potential energy stored as work is done on a spring.
What you need to know
Answer each one before you reveal it.
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Key term
Give an example of forces compressing an object.
Key term
Give an example of forces bending an object.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the force that stretches a spring when a mass is hung from it.
Model answer
The weight of the hanging mass pulls down on the spring and stretches it.
- 2
Give an example of forces compressing an object.
Model answer
The weight of a person sitting on a mattress compresses the springs inside it.
- 3
Give an example of forces bending an object.
Model answer
The weight of a diver bends a springboard that is held firmly at one end.
- 4
Explain why more than one force must act to change the shape of a stationary object.
Model answer
A single force would simply make the object move, so a second force is needed to hold or oppose it for the object to stretch, bend or compress.
- 5
What is elastic deformation?
Model answer
It is a change of shape from which the object returns to its original shape once the forces are removed.
- 6
What is inelastic deformation?
Model answer
It is a change of shape that is not fully recovered, so the object keeps a permanent change of shape when the forces are removed.
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