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 AAtmospheric pressureDistance, 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 quickly
Magnetism and Electromagnetism
Particle Model of Matter
Space Physics
Waves
Topic overviewTransverse and longitudinal waves, and the wave equationWave properties, and refraction at a boundaryReflection of 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
Work done and energy transfer
- 3 things to know
- Paper 2
Overview
When work is and is not done on an object, the equation for work done in words and symbols with calculations, the units of work, force and distance, the joule and the newton-metre, the energy transfer when a crane lifts a load, and how work done against friction heats a car's brakes.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What two quantities must be known to calculate the work done by a force?
Key term
State the equation for work done, in words.
Questions from this subtopic
Each one with the model answer underneath.
- 1
When is work done on an object?
Model answer
Work is done when a force causes the object to move through a distance.
- 2
A person pushes hard against a wall that does not move. Explain whether work is done on the wall.
Model answer
No work is done on the wall, because the force does not cause any displacement.
- 3
What two quantities must be known to calculate the work done by a force?
Model answer
The size of the force and the distance moved along its line of action.
- 4
State the equation for work done, in words.
Model answer
Work done = force × distance moved along the line of action of the force.
- 5
A force of 40 N drags a box 5 m in the direction of the force. Calculate the work done.
Model answer
Work done = 40 × 5 = 200 J.
- 6
A shopper carries a bag horizontally at a constant height. Explain why no work is done by the upward force supporting the bag.
Model answer
The bag moves at right angles to that force, so no distance is moved along its line of action.
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