IGCSE›Oxford AQA IGCSE Physics›Mind mapsMotionOxford AQA IGCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsDistance-time graphsGradient = speedFlat line = stationaryStraight slope = constant speedCurve = speed changingSteeper line = fasterFinding speedspeed=ΔdistanceΔtime\text{speed} = \frac{\Delta \text{distance}}{\Delta \text{time}}speed=ΔtimeΔdistancePick two points on the lineExample: 40 m÷8 s=5 m/s40\,\text{m} \div 8\,\text{s} = 5\,\text{m/s}40m÷8s=5m/sMotionspeed and velocitymsm/sVelocitySpeed in a given directionVelocity is a vector, speed a scalarv=stv = \frac{s}{t}v=tsDisplacement: straight line, start to finishAverage speedUsed for non-uniform motionaverage speed=total distancetotal time\text{average speed} = \frac{\text{total distance}}{\text{total time}}average speed=total timetotal distanceInstantaneous speed: gradient at one pointExam tipsState 'gradient = speed' explicitlySay 'velocity' only when direction mattersTotal distance and time given? Use v=s/tv = s/tv=s/t