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
Area under a velocity-time graph, and the uniform acceleration equation
- 3 things to know
- Physics Paper 2
Overview
Finding distance from the area under a curved velocity-time line, the equation linking final velocity, initial velocity, acceleration and distance, free fall at 9.8 m/s², and terminal velocity.
What you need to know
Answer each one before you reveal it.
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Key term
State in words the equation linking final velocity, initial velocity, acceleration and distance for uniform acceleration.
Key term
Write the uniform acceleration equation using the symbols v, u, a and s.
Questions from this subtopic
Each one with the model answer underneath.
- 1
How can the distance travelled be found when a velocity–time line is curved rather than straight?
Model answer
By counting the squares under the curve and multiplying by the distance each square represents.
- 2
On a velocity–time graph each square represents 2 m/s along one side and 1 s along the other. What distance does one square represent?
Model answer
Each square represents 2 m, because 2 m/s × 1 s = 2 m.
- 3
To what kind of motion does the equation linking final velocity, initial velocity, acceleration and distance apply?
Model answer
It applies only to motion with uniform, that is constant, acceleration.
- 4
State in words the equation linking final velocity, initial velocity, acceleration and distance for uniform acceleration.
Model answer
Final velocity squared minus initial velocity squared = 2 × acceleration × distance.
- 5
Write the uniform acceleration equation using the symbols v, u, a and s.
Model answer
v² − u² = 2as.
- 6
A car starts from rest and accelerates uniformly at 2 m/s² over a distance of 100 m. Calculate its final velocity.
Model answer
The final velocity is 20 m/s, because v² = 2 × 2 m/s² × 100 m = 400.
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