# pivot F 2 F 3 F 1 AP Physics 1 Practice Exam #3 (2/11/16)

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1 AP Physics 1 Prctice Exm #3 (/11/16) Directions: Ech questions or incomplete sttements below is followed by four suggested nswers or completions. Select one tht is best in ech cse nd n enter pproprite letter in corresponding spce on nswer sheet. 1. A hnging verticlly from spring undergoes simple hrmonic motion. Which following grphs could represent ccelertion s function position x for this, where x = 0 is midpoint hrmonic motion? ) b) x c) d) x 1 3 x F 1 F F 3 pivot. A rigid rod is pivoted t its right end. Three s identicl mgnitude but different directions re pplied t positions, 1,, nd 3 s shown. Which following correctly rnks rques τ 1, τ, nd τ 3 provided by s F 1, F, nd F 3? ) τ 1 > τ > τ 3. b) τ 3 > τ > τ 1. c) τ > τ 1 > τ 3. d) τ > τ 1 = τ 3. /11/16 1

2 d x Fulcrum Force probe 3. In lborry, long pltform negligible mss is free rotte on fulcrum. A probe is plced fixed distnce x from fulcrum, supporting pltform. An object foxed mss is plced vrible distnce d from fulcrum. For ech position d, probe is red. It is desired determine mss object from grph dt. Which following cn determine object s mss? ) Plot reding in probe times x on verticl xis; plot grvittionl field times d on horizontl xis. The mss is slope line. b) Plot reding in probe on verticl xis; plot distnce d on horizontl xis. The mss is re under grph. c) Plot reding in probe on verticl xis; plot distnce d multiplied by distnce x on horizontl xis. The mss is y-intercept grph. d) Plot reding in probe times on verticl xis; plot distnce x on horizontl xis. The mss is slope line divided by grvittionl field. 4. A probe is used stretch spring by 0 cm. The grph s function distnce shown in te preceding figure is produced nd used determine mount work done in stretching spring 0 cm. The experimenter reports result s 3,000 J. Which following is resonble estimte experimentl uncertinty on this mesurement? ) 3,000 ± 3 J b) 3,000 ± 30 J c) 3,000 ± 300 J d) 3,000 ±3,000 J /11/16

3 5. A swimmer is ble propel himself forwrd through wter by moving his rms. Which following correctly sttes pplicnt nd recipient responsible for swimmer s forwrd ccelertion? ) The surrounding wter on swimmer s rms. b) The swimmer s rms on swimmer s rso c) The o swimmer s rms on surrounding wter d) The swimmer s rso on swimmer s rms 6. A 10 kg wgon moves horizontlly t n initil speed 5 m/s. A 30 N is pplied wgon by pulling rigid hndle, which is ngled 60 bove horizontl. The wgon continues move horizontlly for nor 0 m. By how much hs wgon s kinetic energy incresed over 0 m? ) 300 J b) 600 J c) 15 J d) 63 J /11/16 3

4 7. In lborry, two crts on trck collide in rrngement shown in preceding figure. Before collision, -kg crt trvels through phogte 1, which mesures its speed; 0.5 kg crt is initilly t rest. After collision, crts bounce one nor. Phogte mesures speed ech crt s it psses. A student is concerned bout his experimentl results. Whe he dds momentum both crts fter collision, he gets vlue greter thn momentum -kg crt before collision. Which following is resonble explntion for discrepncy? ) The trck might hve been slnted such tht crts were moving downhill. b) Humn error might hve been involved in reding phogtes. c) Friction might not hve been negligible. d) d) The collision might not hve been elstic. 8. The rdius Mrs is bout hlf tht Erth; mss Mrs is bout one-tenth tht Erth. Which following is closest grvittionl field t surfce Mrs? ) 10 N/kg b) 4 N/kg c) N/kg d) d) 0.5 N/kg 9. A 1-kg object is relesed from rest t p rough-surfced incline. The object slides without rotting botm incline. The object s kinetic energy t botm must be ) Equl s grvittionl potentil energy when it ws relesed, becuse tl mechnicl energy must be conserved. b) Equl s grvittionl potentil energy when it ws relesed, becuse gin in kinetic energy compenstes for gin in kinetic energy compenstes for mechnicl energy lost rml energy on rough incline. c) Less thn s grvittionl potentil energy when it ws relesed, becuse grvittionl potentil energy ws converted both rml energy nd kinetic energy. d) d) Less thn s grvittionl potentil energy when it ws relesed, becuse work done by friction must be greter thn s gin in kinetic energy. /11/16 4

5 10. In lborry, 3- kg crt experiences vrying net. This net is mesured s function time, nd dt collected re displyed in grph bove. Wht is chnge in crt s momentum during te intervl t = 0 t = s? ) 5 N s b) 10 N s c) 15 N s d) 30 N s 11. A is ttched verticl spring. The is pulled down distnce A from equilibrium, s shown bove, nd relesed from rest. The moves upwrd; highest position bove equilibrium reched by mss is less thn A, s shown. When mss returns downwrd, how fr below te equilibrium position will it rech? ) Greter th distnce A below equilibrium b) Less thn distnce A below equilibrium c) Equl distnce A below equilibrium d) No distnce will fll only equilibrium position. /11/16 5

6 1. Two s, mss m nd m, re initilly t rest on horizontl frictionless surfce. A F is exerted individully on ech, s shown bove. The grph shows how F vries with time t. Which hs gretest verge power provided it between t 5 0 s nd t 5 3 s? ) The mss1m AP Physics nd AP Physics Course nd Exm Description b) The mss m c) Both s hve sme power provided m referknowing following d) It cnnot Questions be determined without rtio mteril. mximum mss m. Block 1 mss m1 nd mss m re sliding long sme line on horizontl frictionless surfce when 1 mss nd mss re sliding long sme line y collide t time tc. Block The grph bovemshows velocities m 1 s s function time. on horizontl frictionless surfce when y collide t time tc. The grph 13. Which hs greter mss, wht informtion indictes this? time. bove shows nd velocities s s function ) Block 1, becuse it hd greter speed before collision. 10. Which hs greter mss, b) Block 1, becuse velocity fter collision is innd wht smeinformtion direction s indictes its velocitythis? before collision. c) Block, becuse it hd smller speed before collision. (A) Block 1, becuse it hd greter speed before collision. d) Block, becuse finl velocity is closer initil velocity thn it is initil velocity (B) Block 1, becuse velocity fter collision is in sme 1. direction s its velocity before collision. 14. How does kinetic, two- system fterspeed collision with its kinetic energy before (C)energy Block becuse it hd smller before compre collision. collision, nd why? (D) Block, becuse finl velocity is closer initil velocity ) It is less, becuse s hve sme velocity fter collision, so some ir kinetic energy ws energy. thn it is initil velocity 1. trnsformed in internl b) It is less, becuse s hve velocities in opposite directions before collision, so some ir kinetic Essentil Knowledge 4.A.: The ccelertion is equl rte chnge velocity energy cncels. with time, nd velocity is equl rte chnge position AP Physics 1 nd Physics Course nd Exmso Description c) It is sme, becuse AP collision ws instntneous, effect externl s during collision is with time. negligible. 5.D.: In collision between objects, liner momentum is In n inelstic kinetic energynd is not sme d) It is sme, becuse s conserved. hve sme velocitycollision, fter collision, re is no friction cting on before nd fter collision. Questions refer following informtion. m. Lerning Objectives 4.A..3: The student is ble crete mmticl models nd nlyze grphicl reltionships for ccelertion, velocity, nd position center mss system nd use m clculte properties motion center mss system. 5.D..5: The student is ble clssify given collision sitution s elstic or inelstic, justify selection conservtion liner momentum s pproprite solution method for n inelstic collision, recognize tht re is common finl velocity for colliding objects in tlly inelstic cse, solve for missing vribles, nd clculte ir vlues. Science Prctices 1.4: The student cn use representtions nd models nlyze situtions or solve problems qulittively nd quntittively..: The student cn pply mmticl routines quntities tht describe nturl phenomen. /11/16 A crt is constrined move long stright line. A vrying net long direction motion is exerted on crt. The crt s velocity v s function time t is shown in grph bove. The five lbeled points 6

7 A crt is constrined move long stright line. A vrying net long direction motion is exerted on crt. The crt s velocity v s function time t is shown in grph bove. The five lbeled points divide grph in four sections. 15. Which following correctly rnks mgnitude verge ccelertion crt during four sections grph? ) CD > AB > BC > DE. b) BC > AB > CD > DE. c) AB > BC > DE > CD. d) d) CD > AB > DE > BC. 16. For which segment des crt move gretest distnce? ) AB b) BC c) CD d) DE 17. During some prt motion, work done on crt is negtive. Wht feture motion indictes this? ) The speed is incresing. b) The speed is decresing. c) The ccelertion is positive. d) The ccelertion is negtive. 18. Two objects re relesed from rest t p rmps with sme dimensions, s shown in figure bove. The sphere rolls down one rmp without slipping. The smll slides down or rmp without friction. Which object reches botm its rmp first, nd why? ) The sphere, becuse it gins rottionl kinetic energy, but does not b) The sphere, becuse it gins mechnicl energy due rque exerted on it, but does not c) The, becuse it does not lose mechnicl energy due friction, but sphere does d) The, becuse it does not gin rottionl kinetic energy, but sphere does /11/16 7

8 19. Block A hngs from light string tht psses over light pulley nd is ttched B, which is on level horizontl frictionless tble, s shownfrom bove. Students psses determine msspulley 6. Block A hngs light stringre tht over light nd Bis from motion two- system fterttched it is relesed fromb,rest. They pln mesure frictionless time A tkes rech floor. The /ƚğŵ/ŷĩžƌŵăƚŝžŷ which is on level horizontl tble, s shown students must lso tkebove. whichstudents!""#\$% following mesurements determine mss B? &'()*(*) +,-!""#\$% re determine mss B from motion ) Only mss A.-,%+,/\$,#", 0 from rest. They pln mesure two- system fter it is relesed b) Only distnce A flls rech floor time A tkes rech floor. Smple The students mustforlso tke which Questions AP Physics 1 Exm c) Only mss A nd distnce A flls rech floor WWd ŽŶƚĞŶƚ following mesurements determine mss B? d) The mss A, distnce A flls rech floor, nd rdius pulley (A) Only mss A (B) Only distnce A flls rech floor (C) Only mss A nd distnce A flls rech floor (D) The mss A, distnce A flls rech floor, nd rdius pulley Essentil Knowledge 3.A.1: An observer in prticulr reference frme cn describe motion n object using such quntities s position, displcement, distnce, velocity, speed, nd ccelertion. 4.A.: The ccelertion is equl rte chnge velocity with time, nd velocity is equl rte chnge position with time. Lerning Objectives 3.A.1.: The student is ble design n experimentl investigtion Theexerted figure shows is s bove motion n exerted object. 0. The figure bove s on tht sliding on on is sliding 3. shows The figure bove shows s onexerted tht istht sliding on on horizontl tht is sliding on horizontl surfce: 4.A..1: The student is ble mke predictions bout motion surfce: grvittionl 40 N, 40 N norml exerted by surfce, nd frictionl exerted horizontl surfce: grvittionl 4040NN, 40 N norml grvittionl 40 N, norml system bsed on fct tht ccelertion is equl left. The coefficient frictionbybetween nd surfce isexerted 0.0. The ccelertion is exerted surfce, ndsurfce, per frictionl exerted frictionl chnge inby velocity unitnd time, nd velocity is equl left. most nerly chnge position time. The coefficient friction between unit nd surfce is 0.0. The exerted inleft. The per coefficient friction ) 1.0 m/s right. between nd surfce is 0.0. ccelertion 4.: mostcn nerly The is student design pln for collecting dt nswer Science Prctices b) 1.0 m/s left. The ccelertion question. is most nerly prticulr scientific (A) 1.0 m/s right c).0 m/s right. 6.4: The student cn mke clims nd predictions bout nturl m s bsed right d).0 m/s left. phenomen on scientific ories nd models. (B) 1.0 m/s(a) 1.0 left (C) (D) s left.0 m/s(b) 1.0 m right m s right.0 m/s(c).0 left (D).0 m s left Essentil.B.1: A grvittionl field g t loction n object with mss m cuses mgnitude mg be exerted on object in direction Knowledge grvittionl field. ůăɛɛŝĩŝđăƚŝžŷɛ 3.A.1: An observer in prticulr reference frme cn describe motion 134%156, n object using such quntities s*ͳ)787*7*9*ͳ07!7*7*9*ͳ0787*709*ͳ0787)7* position, displcement, distnce, velocity, speed, nd ccelertion. +:156, )7)9;7)9*7<9)7)9*7<9)7)9*7=9)7) 3.B.1: If n object interest intercts with severl or objects, net is vecr sum individul s. 160 /11/16 3.B.: Free-body digrms re useful ols for visulizing s being exerted on single object nd writing equtions tht represent physicl sitution. Return Tble Contents Lerning Objectives.B.1.1: The student is ble pply clculte grvittionl on n object with mss m in grvittionl field strength g in context effects net on objects nd systems. 3.A.1.1: The student is ble express motion n object using nrrtive, mmticl, nd grphicl representtions. 3.B.1.3: The student is ble reexpress free-body digrm representtion 015 The College Bord. 8

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