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
Momentum and its conservation
- 2 things to know
- Physics Paper 2
Overview
Momentum as mass times velocity in words and symbols with its units and calculations, the momentum of a stationary object, conservation of momentum in a closed system, and explaining skaters pushing apart, colliding trolleys that join together and a recoiling rifle.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
State the word equation that defines momentum.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which two quantities are multiplied together to give the momentum of a moving object?
Model answer
The mass of the object and its velocity.
- 2
State the word equation that defines momentum.
Model answer
Momentum = mass × velocity.
- 3
The velocity of an object doubles while its mass stays the same. What happens to its momentum?
Model answer
Its momentum doubles, because momentum is proportional to velocity.
- 4
Write the equation for momentum using the symbols p, m and v.
Model answer
p = m v.
- 5
Calculate the momentum of a runner of mass 60 kg moving at 5 m/s.
Model answer
The momentum is 300 kg·m/s, from 60 kg × 5 m/s.
- 6
In what unit is momentum measured?
Model answer
In kilograms metre per second, kg·m/s.
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