《As物理历年真题分类汇编》Word下载.docx

《As物理历年真题分类汇编》Word下载.docx

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Aweight<

drag

Bweight=drag

Cweight<

upthrust

Dweight>

4Aruleroflength0.30mispivotedatitscentre.Equalandoppositeforcesofmagnitude2.0Nareappliedtotheendsoftheruler,creatingacoupleasshown.

Whatisthemagnitudeofthetorqueofthecoupleontherulerwhenitisinthepositionshown?

A0.23NmB0.39NmC0.46NmD0.60Nm

5ThediagramshowstwovectorsXandY.（02s）

InwhichvectortriangledoesthevectorZshowthemagnitudeanddirectionofvectorX–Y?

6uniformmetreruleofmass100gissupportedbyaknife-edgeatthe40cmmarkandastringatthe100cmmark.Thestringpassesroundafrictionlesspulleyandcarriesamassof20gasshowninthediagram.（02w）

Atwhichmarkontherulemusta50gmassbesuspendedsothattherulebalances?

A4cmB36cmC44cmD96cm

7Thediagramsrepresentsystemsofcoplanarforcesactingatapoint.Thelengthsoftheforcevectorsrepresentthemagnitudesoftheforces.（02w）

Whichsystemofforcesisinequilibrium?

8Whatismeantbytheweightofanobject?

（02w）

Athegravitationalfieldactingontheobject

Bthegravitationalforceactingontheobject

Cthemassoftheobjectmultipliedbygravity

Dtheobject’smassmultipliedbyitsacceleration

9Whichofthefollowingpairsofforces,actingonacircularobject,constitutesacouple?

10ApendulumbobisheldstationarybyahorizontalforceH.Thethreeforcesactingonthebobareshowninthediagram.（02w）

ThetensioninthestringofthependulumisT.TheweightofthependulumbobisW.

Whichstatementiscorrect?

AH=Tcos30BT=Hsin30CW=Tcos30DW=Tsin30

11Twoforces,eachof10N,actatapointPasshowninthediagram.Theanglebetweenthedirectionsoftheforcesis120°

.（03s）

Whatisthemagnitudeoftheresultantforce?

A5NB10NC17ND20N

12Thediagramshowsfourforcesappliedtoacircularobject.（03s）

Whichofthefollowingdescribestheresultantforceandresultanttorqueontheobject?

resultantforce

resultanttorque

A

B

C

D

zero

non-zero

13Aballoonisacteduponbythreeforces,weight,upthrustandsidewaysforceduetothewind,asshowninthediagram.（03s）

Whatistheverticalcomponentoftheresultantforceontheballoon?

A500NB1000NC10000ND10500N

14Aforceof5NmayberepresentedbytwoperpendicularcomponentsOYandOXasshowninthediagram,whichisnotdrawntoscale.（03w）

OYisofmagnitude3N.

WhatisthemagnitudeofOX?

A2NB3NC4ND5N

15Ahingeddoorisheldclosedinthehorizontalpositionbyacable.

Threeforcesactonthedoor:

theweightWofthedoor,thetensionTinthecable,andtheforceHatthehinge.（03w）

Whichlistgivesthethreeforcesinincreasingorderofmagnitude?

AH,T,WBT,H,WCW,H,TDW,T,H

16Aspannerisusedtotightenanutasshown.（03w）

AforceFisappliedatright-anglestothespanneratadistanceof0.25mfromthecentreofthenut.Whenthenutisfullytightened,theappliedforceis200N.

Whatistheresistivetorque,inananticlockwisedirection,preventingfurthertightening?

A8NmB25NmC50NmD800Nm

17Twoparallelforces,eachofmagnitudeF,actonabodyasshown.（03w）

Whatisthemagnitudeofthetorqueonthebodyproducedbytheseforces?

AFdBFsC2FdD2Fs

18Thediagramshowsasignofweight20Nsuspendedfromapole,attachedtoawall.ThepoleiskeptinequilibriumbyawireattachedatpointXofthepole.

（04s）

TheforceexertedbythepoleatpointXisF,andthetensioninthewireis40N.

WhichdiagramrepresentsthethreeforcesactingatpointX?

19Auniformbeamofweight50Nis3.0mlongandissupportedonapivotsituated1.0mfromoneend.WhenaloadofweightWishungfromthatend,thebeamisinequilibrium,asshowninthediagram.（04s）

WhatisthevalueofW?

A25NB50NC75ND100N

20Whichtwovectordiagramsrepresentforcesinequilibrium?

（04w）

APandQ

BQandR

CRandS

DSandP

21Alonguniformbeamispivotedatoneend.Aforceof300Nisappliedtoholdthebeamhorizontally.（04w）

Whatistheweightofthebeam?

A300NB480NC600ND960N

22ThevectordiagramshowsthreecoplanarforcesactingonanobjectatP.（05s）

A↓B↘C↙D↗

23AnL-shapedrigidleverarmispivotedatpointP.（05s）

Threeforcesactontheleverarm,asshowninthediagram.

WhatisthemagnitudeoftheresultantmomentoftheseforcesaboutpointP?

A30NmB35NmC50NmD90Nm

24Whatisthecentreofgravityofanobject?

（05s）

Athegeometricalcentreoftheobject

Bthepointaboutwhichthetotaltorqueiszero

Cthepointatwhichtheweightoftheobjectmaybeconsideredtoact

Dthepointthroughwhichgravityacts

25Astoneisprojectedhorizontallyinavacuumandmovesalongapathasshown.Xisapointonthispath.XVandXHareverticalandhorizontallinesrespectivelythroughX.XTisthetangenttothepathatX.（05w）

AlongwhichdirectionordirectionsdoforcesactonthestoneatX?

AXVBXHCXVandXHDXT

26Auniformbeamofweight100NispivotedatPasshown.Weightsof10Nand20Nareattachedtoitsends.（05w）

Thelengthofthebeamismarkedoffat0.1mintervals.

Atwhichpointshouldafurtherweightof20Nbeattachedtoachieveequilibrium?

27Thediagramshowsfourforcesappliedtoacircularobject.（05w）

non-zero

28ThegravitationalfieldstrengthonthesurfaceofplanetPisonetenthofthatonthesurfaceofplanetQ.（05w）

OnthesurfaceofP,abodyhasitsmassmeasuredtobe1.0kganditsweightmeasuredtobe1.0N.

WhatresultsareobtainedformeasurementsofthemassandweightofthesamebodyonthesurfaceofplanetQ?

massonQ

weightonQ

1.0kg

10kg

0.1N

10N

100N

29AforceFisappliedtoabeamatadistancedfromapivot.Theforceactsatanangleθtoalineperpendiculartothebeam.（06s）

Whichcombinationwillcausethelargestturningeffectaboutthepivot?

F

d

large

small

30Arigiduniformbaroflength2.4mispivotedhorizontallyatitsmid-point.（06s）

Weightsarehungfromtwopointsofthebarasshowninthediagram.Tomaintainhorizontalequilibrium,acoupleisappliedtothebar.

Whatisthetorqueanddirectionofthiscouple?

A40NmclockwiseB40Nmanticlockwise

C80NmclockwiseD80Nmanticlockwise

31Thediagramsshowthreeforcesactingonabody.（06s）

Inwhichdiagramisthebodyinequilibrium?

32ArigidcirculardiscofradiusrhasitscentreatX.AnumberofforcesofequalmagnitudeFactattheedgeofthedisc.Alltheforcesareintheplaneofthedisc.（06w）

Whicharrangementofforcesprovidesamomentofmagnitude2FraboutX?

33Threecoplanarforces,eachofmagnitude10N,actthroughthesamepointofabodyinthedirectionsshown.（06w）

A0NB1.3NC7.3ND10N

34Whichforceiscausedbyapressuredifference?

（06w）

Afriction

Bupthrust

Cviscousforce

Dweight

35Two8.0Nforcesactateachendofabeamoflength0.60m.Theforcesareparallelandactinoppositedirections.Theanglebetweentheforcesandthebeamis60°

.（07s）

Whatisthetorqueofthecoupleexertedonthebeam?

A2.4NmB4.2NmC4.8NmD9.6Nm

36Whatismeantbytheweightofanobject?

（07s）

37Thediagramshowsaplanviewofadoorwhichrequiresamomentof12Nmtoopenit.（07w）

Whatistheminimumforcethatmustbeappliedatthedoor’smidpointtoensureitopens?

A4.8NB9.6NC15ND30N

38Thesymbolrepresentstheaccelerationoffreefall.（07w）

Whichofthesestatementsiscorrect?

Aisgravity.

Bisreducedbyairresistance.

Cistheratioweight/mass.

Distheweightofanobject.

39Whichtwovectordiagramsrepresentforcesinequilibrium?

（07w）

APandQBQandRCRandSDSandP

40Thediagramshowsadiving-boardheldinpositionbytworodsXandY.

（01s）

Whichadditionalforcesdotheserodsexertontheboardwhenadiverofweight600Nstandsontheright-handend?

atX（downwards）

atY（upwards）

400N

600N

900N

1000N

1200N

1500N

41AsmallballofweightWissuspendedbyalightth