OCR•GCSE•Physics
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P8: Global Challenges
Physics on the move, powering Earth and beyond Earth
Practice 60 subtopics in P8: Global Challenges. All questions match the OCR GCSE specification.
About P8: Global Challenges
P8: Global Challenges is a key topic in the OCR GCSE Physicsspecification. This topic covers physics on the move, powering earth and beyond earth.
Master all 60 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (60)
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Typical speeds for everyday activitiesWalking: ~1.5 m/s, Running: ~3 m/sCycling: ~6 m/s, Cars: ~13-30 m/sSound in air: ~330 m/sEstimating accelerationsReaction time: definition and factorsTypical reaction times: 0.2-0.9 sMeasuring reaction timeThinking distanceBraking distanceStopping distance = thinking + brakingFactors affecting thinking distanceFactors affecting braking distanceSpeed and braking distance relationshipEstimating forces in collisions (HT)Vehicle safety featuresCrumple zones and energy absorptionSeat belts and airbagsEnergy resources: renewable vs non-renewableFossil fuels: coal, oil, natural gasNuclear fuelRenewable: solar, wind, water, geothermalBiofuels and biomassComparing energy resourcesEnvironmental impactsReliability and supply issuesThe National GridPower stations to consumersStep-up transformers and transmissionReducing power losses in cablesStep-down transformers for distributionUK mains supply: 230V, 50HzAC vs DC supplyLive, neutral and earth wiresColour coding of wiresThe Solar System compositionPlanets, dwarf planets, moonsAsteroids, comets, meteorsThe Sun as our starLight years and astronomical distancesNatural and artificial satellitesSatellite orbits: circular and ellipticalGeostationary orbitsPolar orbitsOrbital radius and speed (HT)Gravity and orbital motion (HT)Red-shift: evidence for expansionDoppler effect and galaxy motionBig Bang theoryCosmic microwave background radiationLife cycle of starsMain sequence starsRed giants and supergiantsWhite dwarfs, neutron stars, black holesFusion in stars: hydrogen to heliumHeavy element formation in supernovaeBlack body radiation (HT)Temperature and peak wavelength (HT)Seismic waves: P and S waves (HT)Earth structure from seismic data (HT)
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