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Answers–Speedm/skm/sm/sm/shskm,h,km/hm/skm/hWhatisvelocity?SeeAnswerThefunction,v(t)isthevelocityinmeterspersecondofabodymoving alongacoordinateline.Answersarefoundattheendofthisdocument.ExplainyouranswerWhattwocontrolsonacarcauseachangeinspeed?Whatcontrol causesachangeinvelocity?PLOC6Doesthespeedometerofacarreadaveragespeedorinstantaneousspeed?Velocityistherateatwhichanobject’smotion changesovertimeItisavectorthathasbothspeedanddirectionWhatisacceleration?SOLUTION:Whenthevelocity-timegraphisalineparalleltothe horizontalaxis,theaccelerationiszeroDeterminetheaccelerationofthecarandthedistancetraveledPhysicalScience:Motion:TheRelationshipsbetween displacement,time,velocityandacceleration:Displacement,TimeandVelocityFind:a)thetotaldistancetraveledbythebodyduringthegiventimeintervalinitial velocity,v0=finalvelocity,v=Km/hIncompletesentences,statewhatthecorrectanswerisandwhyitiscorrectIfyouhaveforgottenanyunitspleasewritea Seesolutionbelow.useequationsofconstantacceleration.Inthischapteryouwilllearnhowto:workwithscalarandvectorquantitiesfordistanceandspeed.A racecaracceleratesuniformlyfromm/stom/sinseconds.5Acaracceleratesuniformlyfromresttoavelocityofkm/heastins.=ms=m/s.(b)Findthespeedof Pwhent j)msInitiallythevelocityofPis(aftertwoseconds?Afterthreeseconds?Afterseconds?Whatistheaveragespeedbetweentwoandfourminutes? WhatistheaveragespeedbetweenfourandMaketestcorrectionstoyourtestCHALLENGEQUESTIONSIfaFerrari,withaninitialvelocityofm/s, acceleratesatarateofm/s/sforseconds,whatwillitsfinalvelocitybe?FallingobjectsdropWHATARESPEEDANDVELOCITY?knowtheterms ‘displacement’,‘velocity’,‘acceleration’and‘eleration’formotioninastraightlineAvelocity-timegraphprovidesinformationonspeedorvelocity,acceleration anddistancetravelledtimetimeInthegraphaboveleft,theobjectisalreadymovingwhenthegraphbegins4hoursΔΔWhatisthedifferencebetweenvelocity andacceleration?b)theVelocityandacceleration.AdditionalPracticeQuestions.(Hint:Changekilometrestometres,andhourstosecondsfirst.)Convertm/sto km/hThischapterintroduceskinematics,whichisabouttheconnectionsbetweendisplacement,velocityandaccelerationSpeedistherateofmovement(,) Velocityisspeedinaparticulardirection(north,)Questions–SpeedAAparticlePmoveswithacceleration( 3iims(a)FindthevelocityofPattimetseconds SteadyvelocityisshownbyahorizontallineSolution:ThegivendataareANSWER:Whenthevelocity-timegraphisalineparalleltothehorizontalaxis,the accelerationiszeroVelocityandaccelerationWhatisthemagnitudeofitsacceleration?AccelerationistherateatwhichvelocitychangesovertimeWhatisthe formulatocalculateacceleration?sketchandScienceWorksheetVelocityandAccelerationWhatisthetotaldistancetravelled,thetotaltimeoftravelandthe averagespeed?Convertkm/htom/sWhenyouhavecompletedit,youshouldDirections:SelectthebestanswerforeachofthefollowingquestionsHowdoyou know?Ifthespeedometerofyourcarreadsaconstantspeedofkm/hr,canyousay%forsurethatthecarhasaconstantvelocity?timeinterval,t=sacceleration, =?Steadyaccelerationisshownbyalineslopingup