IGCSE›Oxford AQA IGCSE Physics›Mind mapsForces & EnergyOxford AQA IGCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWork doneEnergy transferred when a force moves an objectW=FdW = FdW=FdOnly distance along the force countsWork against friction: energy heats surroundingsElastic energyStored when a spring is stretched or squashedEe=12ke2E_e = \frac{1}{2}ke^2Ee=21ke2Only within the limit of proportionalityGravitational energyEnergy from height above a reference pointEp=mghE_p = mghEp=mghg is gravitational field strength, N/kgForces, energywork and energy storesJWEkE_kEkKinetic energyEnergy of a moving objectEk=12mv2E_k = \frac{1}{2}mv^2Ek=21mv2Speed is squaredDouble the speed: 4x the energyPowerRate of transferring energyP=Et=WtP = \frac{E}{t} = \frac{W}{t}P=tE=tWMeasured in wattsExam tipsRoad safety: link to the squared termSideways force does no work