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
Scalars, vectors, forces and the resultant force
- 3 things to know
- Physics Paper 2
Overview
Scalar and vector quantities and why velocity is a vector, representing vectors with arrows, contact and non-contact forces with examples of each, force as a vector and the pair of forces produced when two objects interact, and finding the resultant of forces acting along a straight line.
What you need to know
Answer each one before you reveal it.
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Key term
What does a scalar quantity tell you about?
Key term
Name three quantities that are scalars.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does a scalar quantity tell you about?
Model answer
A scalar quantity has magnitude, or size, only.
- 2
Name three quantities that are scalars.
Model answer
Mass, speed and energy are all scalar quantities.
- 3
What two things does a vector quantity have?
Model answer
A vector quantity has a magnitude and an associated direction.
- 4
Explain why velocity is a vector but speed is a scalar.
Model answer
Velocity states a direction as well as a size, while speed states only a size.
- 5
How is a vector quantity represented on a diagram?
Model answer
It is represented by an arrow.
- 6
What does the length of an arrow representing a vector show?
Model answer
The length shows the magnitude of the vector quantity.
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