AP物理C力学模拟卷Multiple Choice Questions.docx

AP物理C力学模拟卷Multiple Choice Questions.docx

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AP物理C力学模拟卷MultipleChoiceQuestions

MultipleChoiceQuestions

Time:

45minutes.YoumayrefertotheConstantssheet.However,youmaynotusetheEquationssheet,andyoumaynotuseacalculatoronthisportionoftheexam.

1.Acannonismountedonatruckthatmovesforwardataspeedof5m/s.Theoperatorwantstolaunchaballfromacannonsotheballgoesasfaraspossiblebeforehittingthelevelsurface.Themuzzlevelocityofthecannonis50m/s.Whatanglefromthehorizontalshouldtheoperatorpointthecannon?

A.5°

B.41°

C.45°

D.49°

E.85°

2.Acarmovingwithspeedvreachesthefootofaninclineofangleθ.Thecarcoastsuptheinclinewithoutusingtheengine.Neglectingfrictionandairresistance,whichofthefollowingiscorrectaboutthemagnitudeofthecar'shorizontalaccelerationaxandverticalaccelerationay?

A.ax=0;ay

B.ax=0;ay=g

C.ax

D.ax

E.axg

3.Abicycleslowsdownwithanaccelerationwhosemagnitudeincreaseslinearlywithtime.Whichofthefollowingvelocity–timegraphscouldrepresentthemotionofthebicycle?

4.Acartisslidingdownalowfrictionincline.Adeviceonthecartlaunchesaball,forcingtheballperpendiculartotheincline,asshownabove.Airresistanceisnegligible.Wherewilltheballlandrelativetothecart,andwhy?

A.Theballwilllandinfrontofthecart,becausetheball'saccelerationcomponentparalleltotheplaneisgreaterthanthecart'saccelerationcomponentparalleltotheplane.

B.Theballwilllandinfrontofthecart,becausetheballhasagreatermagnitudeofaccelerationthanthecart.

C.Theballwilllandinthecart,becauseboththeballandthecarthavethesamecomponentofaccelerationparalleltotheplane.

D.Theballwilllandinthecart,becauseboththeballandthecarthavethesamemagnitudeofacceleration.

E.Theballwilllandbehindthecart,becausetheballslowsdowninthehorizontaldirectionafteritleavesthecart.

5.Thequantity"jerk,"j,isdefinedasthetimederivativeofanobject'sacceleration,

Whatisthephysicalmeaningoftheareaunderagraphofjerkvs.time?

A.Thearearepresentstheobject'sacceleration.

B.Thearearepresentstheobject'schangeinacceleration.

C.Thearearepresentstheobject'schangeinvelocity.

D.Thearearepresentstheobject'svelocity.

E.Thearearepresentstheobject'schangeinposition.

6.Aparticlemovesalongthex-axiswithapositiongivenbytheequationx（t）=5+3t,wherexisinmeters,andtisinseconds.Thepositivedirectioniseast.WhichofthefollowingstatementsabouttheparticleisFALSE.

1.Theparticleiseastoftheoriginatt=0.

2.Theparticleisatrestatt=0.

3.Theparticle'svelocityisconstant.

4.Theparticle'saccelerationisconstant.

5.Theparticlewillneverbewestofpositionx=0.

7.Amasshangsfromtworopesatunequalangles,asshownabove.Whichofthefollowingmakescorrectcomparisonsofthehorizontalandverticalcomponentsofthetensionineachrope?

8.TheforceofairresistanceFonamassisfoundtoobeytheequationF=bv2,wherevisthespeedofthemass,fortherangeofspeedsinvestigatedinanexperiment.AgraphofFNvs.v2isshownabove.Whatisthevalueofb?

A.0.83kg/m

B.1.7kg/m

C.3.0kg/m

D.5.0kg/m

E.1.0kg/m

F.zero

9.Aboxsitsonaninclinedplanewithoutsliding.Astheangleoftheplane（measuredfromthehorizontal）increases,thenormalforce

A.increaseslinearly

B.decreaseslinearly

C.doesnotchange

D.decreasesnonlinearly

E.increasesnonlinearly

10.Whichofthefollowingconditionsarenecessaryforanobjecttobeinstaticequilibrium?

I.Thevectorsumofalltorquesontheobjectmustequalzero.

II.Thevectorsumofallforcesontheobjectmustequalzero.

III.Thesumoftheobject'spotentialandkineticenergiesmustbezero.

D.Ionly

E.IIonly

F.IIIonly

G.IandIIonly

H.I,II,andIII

11.Astudentpushesabig16-kgboxacrosstheflooratconstantspeed.Hepusheswithaforceof50Nangled35°fromthehorizontal,asshowninthediagramabove.Ifthestudentpullsratherthanpushestheboxatthesameangle,whilemaintainingaconstantspeed,whatwillhappentotheforceoffriction?

A.Itmustincrease.

B.Itmustdecrease.

C.Itmustremainthesame.

D.Itwillincreaseonlyifthespeedisgreaterthan3.1m/s.

E.Itwillincreaseonlyifthespeedislessthan3.1m/s.

12.ConsiderasystemconsistingonlyoftheEarthandabowlingball,whichmovesupwardinaparabolaaboveEarth'ssurface.ThedownwardforceofEarth'sgravityontheball,andtheupwardforceoftheball'sgravityontheEarth,formaNewton'sthirdlawforcepair.Whichofthefollowingstatementsabouttheballiscorrect?

A.Theballmustbeinequilibriumsincetheupwardforcesmustcanceldownwardforces.

B.TheballacceleratestowardtheEarthbecausetheforceofgravityontheballisgreaterthantheforceoftheballontheEarth.

C.TheballacceleratestowardtheEarthbecausetheforceofgravityontheballistheonlyforceactingontheball.

D.TheballacceleratesawayfromEarthbecausetheforcecausingtheballtomoveupwardisgreaterthantheforceofgravityontheball.

E.TheballacceleratesawayfromEarthbecausetheforcecausingtheballtomoveupwardplustheforceoftheballontheEartharetogethergreaterthantheforceofgravityontheball.

13.Amassmisattachedtoamass3mbyarigidbarofnegligiblemassandlengthL.Initially,thesmallermassislocateddirectlyabovethelargermass,asshownabove.Howmuchworkisnecessarytofliptherod180°sothatthelargermassisdirectlyabovethesmallermass?

A.4mgL

B.2mgL

C.mgL

D.4pmgL

E.2pmgL

14.Aballrollshorizontallywithspeedvoffofatableaheighthabovetheground.Justbeforetheballhitstheground,whatisitsspeed?

A.

B.

C.

D.v

E.

15.Apendulumislaunchedintosimpleharmonicmotionintwodifferentways,asshownabove,fromapointthatisaheighthaboveitslowestpoint.Duringbothlaunches,thebobisgivenaninitialspeedof3.0m/s.Onthefirstlaunch,theinitialvelocityofthebobisdirectedupwardalongthependulum'spath,andonthesecondlaunchitisdirecteddownwardalongthependulum'spath.Whichlaunchwillcausethependulumtoswingwiththelargeramplitude?

A.thefirstlaunch

B.thesecondlaunch

C.Bothlaunchesproducethesameamplitude.

D.Theanswerdependsontheinitialheighth.

E.Theanswerdependsonthelengthofthesupportingrope.

16.ThemassMismovingtotherightwithvelocityv0atpositionx=x0.Neglectfriction.Thespringhasforceconstantk.Whatisthetotalmechanicalenergyoftheblockatthisposition?

17.Asphere,acube,andacylinder,allofequalmass,arereleasedfromrestfromthetopofashortincline.Thesurfaceoftheinclineisextremelyslick,somuchsothattheobjectsdonotrotatewhenreleased,butratherslidewithnegligiblefriction.Whichreachesthebaseoftheinclinefirst?

A.thesphere

B.thecube

C.thecylinder

D.Allreachthebaseatthesametime.

E.Theanswerdependsontherelativesizesoftheobjects.

18.BlockBisatrestonasmoothtabletop.Itisattachedtoalongspring,whichisinturnanchoredtothewall.BlockAslidestowardandcollideswithblockB.Considertwopossiblecollisions:

CollisionI:

BlockAbouncesbackoffofblockB.

CollisionII:

BlockAstickstoblockB.

WhichofthefollowingiscorrectaboutthespeedofblockBimmediatelyafterthecollision?

A.ItisfasterincaseIIthanincaseIONLYifblockBisheavier.

B.ItisfasterincaseIthanincaseIIONLYifblockBisheavier.

C.ItisfasterincaseIIthanincaseIregardlessofthemassofeachblock.

D.ItisfasterincaseIthanincaseIIregardlessofthemassofeachblock.

E.Itisthesameineithercaseregardlessofthemassofeachblock.

19.A0.30-kgbirdisflyingfromrighttoleftat30m/s.Thebirdcollideswithandstickstoa0.50-kgballwhichismovingstraightupwithspeed6.0m/s.Whatisthemagnitudeofthemomentumoftheball/birdcombinationimmediatelyaftercollision?

A.12.0N•s

B.9.5N•s

C.9.0N•s

D.6.0N•s

E.3.0N•s

20.TheforceFonamassisshownaboveasafunctionoftimet.Whichofthefollowingmethodscanbeusedtodeterminetheimpulseexperiencedbythemass?

I.multiplyingtheaverageforcebytmax

II.calculatingtheareaunderthelineonthegraph

III.takingtheintegral

D.IIonly

E.IIIonly

F.IIandIIIonly

G.IandIIonly

H.I,II,andIII

21.Aprojectileislaunchedonlevelgroundinaparabolicpathsothatitsrangewouldnormallybe500m.Whentheprojectileisatthepeakofitsflight,theprojectilebreaksintotwopiecesofequalmass.Oneofthesepiecesfallsstraightdown,withnofurtherhorizontalmotion.Howfarawayfromthelaunchpointdoestheotherpieceland?

A.250m

B.375m

C.500m

D.750m

E.1000m

Questions22and23

ArigidrodoflengthLandmassMisfloatingatrestinspacefarfromagravitationalfield.Asmallblobofputtyofmassm

22.Howwilltherod/puttycontraptionmoveafterthecollision?

A.Thecontraptionwillhavenotranslationalmotion,butwillrotateabouttherod'scenterofmass.

B.Thecontraptionwillhavenotranslationalmotion,butwillrotateaboutthecenterofmassoftherodandputtycombined.

C.Thecontraptionwillmovetotherightandrotateaboutthepositionoftheputty.

D.Thecontraptionwillmovetotherightandrotateaboutthecenterofmassoftherodandputtycombined.

E.Thecontraptionwillmovetotherightandrotateaboutthe