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
Distance, displacement and speed
- 3 things to know
- Physics Paper 2
Overview
Distance as a scalar and displacement as a vector with magnitude and direction, speed as a scalar that rarely stays constant, the factors affecting how fast people walk, run and cycle, typical speeds for walking, running, cycling, cars and aeroplanes, and other things whose speed varies.
What you need to know
Answer each one before you reveal it.
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Key term
Why is distance classed as a scalar quantity?
Key term
What two pieces of information together make up a displacement?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does the quantity distance tell you about the movement of an object?
Model answer
Distance tells you how far the object has moved.
- 2
Why is distance classed as a scalar quantity?
Model answer
Distance has a size only and takes no account of direction.
- 3
How is the displacement of an object measured?
Model answer
It is measured in a straight line from the start point to the finish point.
- 4
What two pieces of information together make up a displacement?
Model answer
The straight-line distance from start to finish, and the direction of that straight line.
- 5
Why is displacement classed as a vector quantity?
Model answer
Displacement has both a size and a direction.
- 6
An athlete runs one complete lap of a track and finishes where they started. What is their displacement?
Model answer
Their displacement is zero, because the finish point is the same as the start point.
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