Key term
AQA GCSE Physics 8463
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 contaminationBackground radiationUses of nuclear radiation, and how half-life affects hazardNuclear fission and nuclear fusion
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 GridStatic chargeElectric fields
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 springMoments, levers and gearsPressure at a surface, and the equation p = F over APressure in a column of liquid, upthrust and floatingAtmospheric pressureResolving 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 conservationChanges in momentum
Magnetism and Electromagnetism
Topic overviewPoles of a magnetMagnetic fields around a magnetThe compass, and plotting a magnetic fieldElectromagnetismFleming's left-hand rule, motors and loudspeakersInduced potentialThe generator effect, alternators, dynamos and microphonesThe structure of a transformer and the turns ratioTransformer power, and using the transformer equations
Particle Model of Matter
Space Physics
Waves
Topic overviewTransverse and longitudinal waves, and the wave equationWave properties, and refraction at a boundaryReflection of wavesSound wavesUltrasound, echo sounding and seismic wavesTypes and uses of electromagnetic wavesRadio waves, and the hazards of ultraviolet, X-rays and gamma raysLensesVisible lightEmission and absorption of infrared radiation, and black bodies
Forces
Changes in momentum
- 2 things to know
- Paper 2
Overview
How a force changes momentum, combining F = m a with the acceleration equation to give force as rate of change of momentum, and how air bags and other safety features lengthen the time.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Which two equations are combined to show that force is the rate of change of momentum?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What happens to the momentum of a moving object when a force acts on it?
Model answer
Its momentum changes.
- 2
What must act on an object that is able to move in order to change its momentum?
Model answer
A force must act on it.
- 3
Which two equations are combined to show that force is the rate of change of momentum?
Model answer
The equation F = m a and the equation for acceleration, a = (v − u) ÷ t.
- 4
Write the equation for acceleration in terms of initial velocity, final velocity and time.
Model answer
a = (v − u) ÷ t.
- 5
Write the equation linking force, change in momentum and the time taken for that change.
Model answer
F = m∆v ÷ ∆t.
- 6
In the equation linking force and momentum, what does the quantity m∆v represent?
Model answer
It represents the change in momentum of the object.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Forces, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
Or £46 a year, about £3.83 a month. Cancel anytime.