Key term
OCR GCSE Combined Science Physics J250
Electricity
Topic overviewCharge, and producing static electricityTransfer of electrons in charging and dischargingCurrent as a rate of flow of chargeCharge, current and timeSeries and parallel circuits, and circuit symbolsCurrent, potential difference and resistanceResistors whose resistance changes, and investigating themLinear and non-linear circuit elements from graphsNet resistance in series and parallelCircuits for measurement, and electrical power
Energy
Topic overviewConservation of energy, and energy storesEnergy changes on heating, and calculating themEnergy of a moving body, a spring and a raised objectDissipation, and energy transfer in domestic devicesPower ratings, and calculating efficiencyReducing unwanted energy transfer, and the rate of cooling
Forces
Topic overviewMeasuring distance and time, and calculating speedConverting units, and ratesVectors and scalars in motionDistance-time and velocity-time graphsAverage speed, and the equations of uniform motionHow objects interact, and forces as vectorsNewton's first lawNewton's second lawWork done, and stored energyPower, and Newton's third lawStretching, bending and compressing; elastic and plasticForce and extension, linear and non-linearThe spring constant, and work done in stretchingGravitational fields, weight and free fallCalculations with weight and gravitational field strength
Global Challenges
Topic overviewTypical speeds and everyday accelerationsReaction time, stopping distance and the dangers of large decelerationsStopping distance, acceleration and collision force calculationsEnergy resources, and trends in their useThe national grid, and step-up and step-down transformersWhy the national grid is efficient, and power in a transformerMains electricity: a.c., d.c. and the domestic supplyLive, neutral and earth wires, and electrical danger
Magnetism and Magnetic Fields
Matter
Topic overviewHow the atomic model changed, and the structure of the atomThe size of atoms, and defining densityDensity of the states of matter, and density calculationsConservation of mass in changes of stateHeating a system, and specific heat capacityCalculations with specific heat capacity and latent heatGas molecules, temperature and pressure
Radioactivity
Waves in Matter
Topic overviewAmplitude, wavelength, frequency and periodThe wave equationTransverse and longitudinal wavesModelling waves with ripples and soundElectromagnetic waves as transverse, and energy transferFrequency and wavelength across the spectrumWhat our eyes detect, and light as an electromagnetic waveUses of electromagnetic wavesHazards of ultraviolet, X-rays and gamma raysInvestigating reflection and refraction of light
Magnetism and Magnetic Fields
Magnetic fields, and the dipping compass
- 3 things to know
- Paper 5 (Physics)
Overview
What a magnetic field is, where it is strongest and how line spacing shows strength, field direction, plotting a field with a compass or iron filings, the dipping compass and what its dip shows about the field and core of the Earth, and why the magnetic pole in the far north behaves as a south pole.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What does the spacing between magnetic field lines tell you about the field?
Key term
What is the agreed direction of a magnetic field line?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by a magnetic field?
Model answer
The region around a magnet in which another magnet or a magnetic material feels a force.
- 2
Where is the magnetic field of a bar magnet strongest?
Model answer
At its poles.
- 3
How does the strength of a magnet's field change as the distance from the magnet increases?
Model answer
It becomes weaker.
- 4
What does the spacing between magnetic field lines tell you about the field?
Model answer
Lines that are closer together show a stronger field.
- 5
What is the agreed direction of a magnetic field line?
Model answer
The direction a free north pole would be pushed, which is away from a north pole and towards a south pole.
- 6
How does a plotting compass show the direction of a magnetic field at a point?
Model answer
Its needle turns until the north end points along the field line at that point.
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