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
Newton's Second and Third Laws
- 2 things to know
- Physics Paper 2
Overview
How resultant force, mass and acceleration are linked, the units in F = m a, inertial mass, investigating force and acceleration with a trolley, and the equal and opposite forces of Newton's Third Law.
What you need to know
Answer each one before you reveal it.
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Key term
The resultant force on an object is doubled while its mass stays the same. What happens to its acceleration?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which three quantities are linked by Newton's Second Law?
Model answer
The resultant force on an object, the mass of the object and its acceleration.
- 2
The resultant force on an object is doubled while its mass stays the same. What happens to its acceleration?
Model answer
The acceleration doubles, because acceleration is proportional to the resultant force.
- 3
Two objects are pushed with the same resultant force, but one has twice the mass of the other. Compare their accelerations.
Model answer
The heavier object has half the acceleration, because acceleration is inversely proportional to mass.
- 4
State the word equation linking resultant force, mass and acceleration.
Model answer
Resultant force = mass × acceleration.
- 5
Write the equation linking resultant force, mass and acceleration using the symbols F, m and a.
Model answer
F = m a.
- 6
In the equation F = m a, what does F stand for and in what unit is it measured?
Model answer
F is the resultant force, measured in newtons, N.
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