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
Forces
Acceleration, deceleration and velocity-time graphs
- 3 things to know
- Physics Paper 2
Overview
The equation for average acceleration with its units and the meaning of ∆v, deceleration and negative acceleration, estimating the accelerations of a sprinter and a car, finding acceleration from the gradient of a velocity–time graph, distance travelled from the area under it, and what horizontal and downward-sloping lines show.
What you need to know
Answer each one before you reveal it.
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Key term
In what unit is acceleration measured, and what symbol represents it?
Key term
What word describes an object that is slowing down?
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the word equation for the average acceleration of an object.
Model answer
Acceleration = change in velocity ÷ time taken.
- 2
A car speeds up from rest to 24 m/s in 6 s. Calculate its average acceleration.
Model answer
Its acceleration is 4 m/s², from 24 m/s ÷ 6 s.
- 3
In what unit is acceleration measured, and what symbol represents it?
Model answer
Acceleration is measured in metres per second squared, m/s², and is represented by a.
- 4
What does the symbol ∆v mean in the acceleration equation, and in what unit is it measured?
Model answer
It is the change in velocity, measured in metres per second, m/s.
- 5
In the acceleration equation, in what unit must the time be measured?
Model answer
In seconds, s.
- 6
What word describes an object that is slowing down?
Model answer
The object is decelerating.
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