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 springDistance, 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
Energy
Elastic and gravitational potential energy
- 3 things to know
- Physics Paper 1
Overview
When the elastic potential energy equation can be used and the limit of proportionality, the units of energy, spring constant and extension with calculations, gravitational potential energy and the quantities that decide it, its equation in words and symbols, and calculating energy, height and mass with a gravitational field strength of 9.8 N/kg.
What you need to know
Answer each one before you reveal it.
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Key term
Explain why the calculated energy stored would be wrong for a spring stretched well beyond its limit of proportionality.
Key term
State the unit in which elastic potential energy is measured.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the condition that must hold before the equation for the energy stored in a stretched spring can be used.
Model answer
The spring must not have been stretched beyond its limit of proportionality.
- 2
State what is meant by the limit of proportionality of a spring.
Model answer
It is the point beyond which the extension of the spring is no longer proportional to the force applied.
- 3
Explain why the calculated energy stored would be wrong for a spring stretched well beyond its limit of proportionality.
Model answer
The equation assumes the extension stays proportional to the force, and beyond that limit it no longer is.
- 4
State the unit in which elastic potential energy is measured.
Model answer
The joule, J.
- 5
State the unit of the spring constant.
Model answer
Newtons per metre, N/m.
- 6
A spring with a spring constant of 300 N/m is stretched by 0.2 m, within its limit of proportionality. Calculate the elastic potential energy stored.
Model answer
Eₑ = ½ × 300 × 0.2² = 6 J.
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