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
Permanent and induced magnets, and magnetic poles
- 3 things to know
- Paper 5 (Physics)
Overview
Attraction and repulsion between poles as a non-contact force, the field lines between like and unlike poles and the neutral point, how the force weakens with distance, permanent and induced magnets, why induced magnetism only attracts, the magnetic metals, and why steel suits permanent magnets and iron suits electromagnets.
What you need to know
Answer each one before you reveal it.
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Key term
State the rule that summarises the force between two magnetic poles.
Key term
Why is the force between two magnetic poles described as a non-contact force?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What happens when the north pole of one bar magnet is brought close to the south pole of another?
Model answer
They attract each other.
- 2
What happens when the north poles of two bar magnets are brought close together?
Model answer
They repel each other.
- 3
State the rule that summarises the force between two magnetic poles.
Model answer
Like poles repel and unlike poles attract.
- 4
Why is the force between two magnetic poles described as a non-contact force?
Model answer
The magnets push or pull on each other without ever touching.
- 5
In which direction do the magnetic field lines outside a bar magnet run?
Model answer
They run from the north pole round to the south pole.
- 6
Describe the field lines in the gap when a north pole and a south pole are placed facing each other.
Model answer
They run straight across the gap from the north pole to the south pole, linking the two magnets together.
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