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
Resolving forces and free body diagrams
- 3 things to know
- Physics Paper 2
Overview
The forces on a book on a table and a boat crossing a lake, free body diagrams, balanced forces at a steady speed, the resultant of forces that do not act along one line, resolving a force into two components at right angles, and scale diagrams for finding a resultant and showing forces in balance.
What you need to know
Answer each one before you reveal it.
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Key term
Describe the four forces acting on a boat travelling across a lake.
Key term
A car travels along a level road at a steady speed. Explain what this tells you about the forces on it.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe the forces acting on a book resting on a table.
Model answer
The weight of the book acts downwards and the normal contact force from the table acts upwards, and they are equal in size.
- 2
Describe the four forces acting on a boat travelling across a lake.
Model answer
Thrust forwards, water resistance backwards, weight downwards and upthrust upwards.
- 3
What is a free body diagram?
Model answer
It shows a single object on its own with every force acting on it represented by an arrow.
- 4
What does it mean to say the forces on an object are balanced?
Model answer
It means the resultant force on the object is zero.
- 5
A car travels along a level road at a steady speed. Explain what this tells you about the forces on it.
Model answer
The driving force equals the resistive forces, so the resultant force on the car is zero.
- 6
When two forces do not act along the same line, what two pieces of information are needed to state their resultant fully?
Model answer
Its magnitude and its direction.
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