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
Kinetic energy
- 3 things to know
- Physics Paper 1
Overview
The two quantities that decide kinetic energy, the kinetic energy equation in words and symbols with calculations of energy, speed and mass, the effect of doubling speed or mass, its units, and elastic potential energy in a stretched spring or catapult with its equation.
What you need to know
Answer each one before you reveal it.
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Key term
State the three situations in which you should be able to calculate the energy stored by an object.
Key term
State the equation, in words, for the kinetic energy of a moving object.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the three situations in which you should be able to calculate the energy stored by an object.
Model answer
A moving object, a stretched spring, and an object raised above ground level.
- 2
State the two quantities that determine the kinetic energy of a moving object.
Model answer
Its mass and its speed.
- 3
State the equation, in words, for the kinetic energy of a moving object.
Model answer
Kinetic energy = ½ × mass × speed².
- 4
A student writes that kinetic energy = ½ × mass × speed. Explain what is wrong with this.
Model answer
The speed must be squared, so kinetic energy = ½ × mass × speed².
- 5
State the symbol equation for the kinetic energy of a moving object.
Model answer
Eₖ = ½mv².
- 6
A car of mass 1200 kg travels at 20 m/s. Calculate its kinetic energy.
Model answer
Eₖ = ½ × 1200 × 20² = 240 000 J, or 240 kJ.
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