01.1 annotates IFigure I1 Ito Iidentify Iequilibrium
Iposition;Isome I(orIall)Iof Ithe Imark Ishould Ibe
... [Show More] Ibelow
ItheIbobIor
(bottomIofImark)IshouldIbeIlevel IwithIbottomIofIbobI1
this Iis Iwhere I(the Ipendulum I/ Ibob) Iis Imoving Ifastest
I/I(pendulumIhas)ImaximumIkinetic Ienergy
or
this IisIwhereItheItransitItimeIisIleast I2
forI1IcondoneIaIpoorly-annotatedIsketchIif
IintentionIisIclarifiedIinI2;IdoInotIallowItalkout
doInotIinsistIonIseeingItheIoutlineIofItheIcard
IasIlong IasItheIvertical IlineIis Iseen;
condoneIarrowsI�I�Ietc;IblobsI��IareIneutral
allowIvertical IlineIofItheImark ItoIbeIalignedIwith
IeitherIedgeIofItheIbobIinItheIleft-handIviewIor
ImarkedIdirectlyIbelowIpointIofIsuspension
I(withinIone-quarterIofIbobIradius)IinItheIrighthandIview,Ieg
ifImarksIareIshownIonIeachIviewIofIthe
Ipendulum,IthenIeachIseparatelyImustIsatisfy
ItheIcriteriaIforI1
2IisIcontingentIonIawardIofI1
forI2comments IaboutIwhyItheImark Iis Inot
IalignedIwithIbobIinIright-handIviewIareIneutral
(atIequilibrium)I‘accelerationIisIzero’ IisIneutral
2 AO1-1b
MARK ISCHEME I– IA-LEVEL IPHYSICS I– I7408/3A I– IOCTOBER I2020
7
Question Answers AdditionalIcomments/Guidelines Mark AO
01.2 useIofIappropriateIhorizontal IscaleIorIwtteI1
useIofIset-squareIwithIedgeImadeIvertical IorIother
IsuitableIequipmentItoIeliminateIparallaxIerrorIinIAR I2
measuresIAR IfromI(either)IedgeIof IdisplacedIbobI3
any Iof I12or I3can Ibe Iearned Iby
IsuitableIannotationItoIFigureI2
forI1rulerIorI'mmIscale’ Ionly;
‘measuring Iwith Ia Iruler Ibetween Ipoints
Imarked Ion Ithe Ifloor’ Iis Iacceptable I(see IA
Ibelow)IorIuseIof IaI‘rulerIplacedIonIfloor’ I(seeIB)
point
IonIfloor
ruler
point A B
onIfloor
forI2allowIuseIofIplumbIline,IspiritIlevel,
IvideoIorIphotographicIequipment;IrejectIclamp
Istand
anyIuseIofItheIfiducial Imark IorItheIideaIthat
ItheIsupporting IbeamIisIhorizontal IareIneutral
withholdI3unless IcandidatesIexplains Ithat
IallowanceIisIbeingImadeIforIradiusI/Idiameter
IofIbobI(seeICIandIDIbelow)
I
C D
MAXI2 AO3.2b
MARK ISCHEME I– IA-LEVEL IPHYSICS I– I7408/3A I– IOCTOBER I2020
8
Question Answers AdditionalIcomments/Guidelines Mark AO
01.3 extrapolationIof IcurveItoI(atIleast)IxI=I0.70ImI1
consistently-recordedIminI3IdpIvalues IforIT0.35IandIT0.70 I 2
evidenceIofIvalidIcalculationI(check Idenominator
Icorrect);IpercentageIincreaseIinIrangeI1.4(0)I%ItoI1.8(0)
I%I3
forI1extrapolationImustIbeIcontinuous
IandIsmooth;IallowI(ruled)IstraightIline;
rejectIhairy,Ithick IorIdashedIlines
IforI2allowIvalues IseenIinIworking;
T0.35ImustIroundItoI2.322; IcondoneIT0.70 IbyIeye
don’tIinsistIonIhorizontal I [Show Less]