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
Particle Model of Matter
Particle motion in gases
- 3 things to know
- Physics Paper 1
Overview
The random motion of gas molecules, how temperature relates to their average kinetic energy, and how collisions with the container walls produce pressure that rises and falls with temperature at constant volume.
What you need to know
Answer each one before you reveal it.
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Key term
What is the temperature of a gas related to?
Key term
What happens to the pressure of a gas in a sealed rigid container when its temperature is increased?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe the motion of the molecules of a gas.
Model answer
They are in constant motion, moving in random directions.
- 2
What is the temperature of a gas related to?
Model answer
The average kinetic energy of its molecules.
- 3
What happens to the average kinetic energy of the molecules of a gas when its temperature is raised?
Model answer
It increases.
- 4
Two different gases are at the same temperature. Compare the average kinetic energy of their molecules.
Model answer
It is the same, because temperature is related to the average kinetic energy of the molecules.
- 5
What is meant by saying that the molecules of a gas are in random motion?
Model answer
They move in all directions with no preferred direction, changing direction whenever they collide.
- 6
What happens to the pressure of a gas in a sealed rigid container when its temperature is increased?
Model answer
The pressure increases.
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