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
Newton's First Law
- 2 things to know
- Paper 2
Overview
What Newton's First Law says about zero resultant force, what happens to stationary and moving objects when forces balance, why a car reaches a top speed and a cyclist who stops pedalling slows down, and the resultant force needed to change speed or direction, as on a bend.
What you need to know
Answer each one before you reveal it.
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Key term
When all the forces acting on an object are balanced, what is the size of the resultant force?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which condition on the forces acting is described by Newton's First Law?
Model answer
It describes what happens when the resultant force acting on an object is zero.
- 2
When all the forces acting on an object are balanced, what is the size of the resultant force?
Model answer
The resultant force is zero.
- 3
What happens to a stationary object if the resultant force on it is zero?
Model answer
It stays stationary.
- 4
What happens to a moving object if the resultant force on it is zero?
Model answer
It keeps moving at the same speed and in the same direction.
- 5
A puck slides across a surface with no resultant force acting on it. What happens to its velocity?
Model answer
Its velocity stays the same, since neither its speed nor its direction changes.
- 6
A van is driven along a level road at a steady speed. What can you say about the driving force and the resistive forces?
Model answer
The resistive forces are balanced by the driving force, so the resultant force is zero.
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