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
Energy
Environmental impact and trends in energy use
- 3 things to know
- Physics Paper 1
Overview
The environmental impact of fossil fuels, nuclear fuel, hydro-electricity, wind turbines, bio-fuel, tidal barrages and solar cells, trends in the use of renewables, coal and total world energy, the move to electric cars, and why economic and social factors limit what science can do about environmental issues.
What you need to know
Answer each one before you reveal it.
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Key term
State one environmental impact of growing crops for bio-fuel.
Key term
Explain why total world energy use has risen.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe the environmental impact of burning fossil fuels.
Model answer
It releases carbon dioxide, which adds to global warming, and sulfur dioxide, which causes acid rain.
- 2
State one environmental impact of using nuclear fuel.
Model answer
It produces radioactive waste that has to be stored safely for a very long time.
- 3
State one environmental impact of hydro-electricity.
Model answer
Flooding a valley behind the dam destroys habitats and can force people to move.
- 4
State two environmental impacts of wind turbines.
Model answer
They take up large areas of land and many people consider them noisy and unsightly.
- 5
State one environmental impact of growing crops for bio-fuel.
Model answer
Land is cleared to grow the crops, destroying habitats and reducing the land available for food.
- 6
State one environmental impact of a tidal barrage.
Model answer
It alters the estuary habitat and harms the animals and plants that live there.
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