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 springDistance, 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
Energy
Energy stores and systems
- 3 things to know
- Physics Paper 1
Overview
What a system is and what happens to its energy when it changes, the changes in energy stores when a ball is thrown upwards, a car hits a wall, a trolley accelerates, a cyclist brakes and a kettle boils, changing a system by heating, by work done by a force and by a current, and energy diagrams drawn to a common scale.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
State what happens to the energy of a system when the system changes.
Key term
When describing an energy change, explain why naming only the store the energy ends up in is not enough.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by a system in physics?
Model answer
A system is an object or a group of objects considered together.
- 2
A single cup of tea cooling on a table is treated as a system. Explain whether a system has to contain more than one object.
Model answer
No, a system can be a single object as well as a group of objects.
- 3
State what happens to the energy of a system when the system changes.
Model answer
Energy is transferred between stores, so the amounts held in the different stores change.
- 4
A student says a falling apple gains energy. Correct this statement.
Model answer
Energy is transferred from the apple's gravitational potential store to its kinetic store; no new energy is made.
- 5
When describing an energy change, explain why naming only the store the energy ends up in is not enough.
Model answer
A full description also names the store the energy came from and any energy dissipated on the way.
- 6
Describe the change in the way energy is stored when a ball is thrown vertically upwards.
Model answer
Energy is transferred from the ball's kinetic store to its gravitational potential store as it rises.
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