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
Forces
The speed of sound, and the distance-speed-time equation
- 3 things to know
- Physics Paper 2
Overview
A typical speed of sound in air, measuring speed from distance and time, the equation s = v t in words and symbols with its units and calculations, rearranging it for time, and calculating average speed for journeys in which the speed keeps changing.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Numbers
A cyclist rides at a constant 6 m/s for 40 s. Calculate the distance travelled.
Key term
State the word equation linking distance travelled, speed and time.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State a typical value for the speed of sound in air.
Model answer
About 330 m/s.
- 2
Roughly how far does a sound travel through air in 3 seconds?
Model answer
About 990 m, because sound travels at roughly 330 m/s in air.
- 3
Which two measurements must be taken in order to calculate the speed of a moving object?
Model answer
The distance the object moves and the time it takes to move that distance.
- 4
Describe how you could measure the speed of a person walking along a corridor.
Model answer
Measure a fixed length of corridor with a tape measure, time the person walking it with a stopwatch, then divide the distance by the time.
- 5
For an object moving at a constant speed, what two quantities decide how far it travels?
Model answer
Its speed and the time for which it travels.
- 6
A cyclist rides at a constant 6 m/s for 40 s. Calculate the distance travelled.
Model answer
The distance is 240 m, from 6 m/s × 40 s.
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