Grade 11 Physics Homework 3. Be prepared to defend your choices in class!

Transcription

1 Gre 11 Physics Homework 3 Be prepre o efen your choices in clss! 1. The grph shows he riion wih ime of he elociy of n objec. Which one of he following grphs bes represens he riion wih ime of he ccelerion of he objec? A. B. C. D. 2. A bll, iniilly res, kes ime o fll hrough ericl isnce h. If ir resisnce is ignore, he ime ken for he bll o fll from res hrough ericl isnce 9h is A. 3. B. 5. C. 9. D. 1. 1

2 3. A rinrop flling hrough ir reches erminl elociy before hiing he groun. A erminl elociy, he fricionl force on he rinrop is A. zero. B. less hn he weigh of he rinrop. C. greer hn he weigh of he rinrop. D. equl o he weigh of he rinrop. 4. An hlee runs roun circulr rck consn spee. Which one of he following grphs bes represens he riion wih ime of he mgniue of he isplcemen of he hlee from he sring posiion uring one lp of he rck? A. B. C. D. 5. A bll is relese from res ner he surfce of he Moon. Which one of he following quniies increses consn re? A. Only isnce fllen B. Only spee C. Only spee n isnce fllen D. Only spee n ccelerion 2

3 6. A bll is roppe from res ime = on o horizonl surfce from which i rebouns. The grph shows he riion of ime wih spee of he bll. A C B D Which one of he following bes represens he poin which he bll jus loses conc wih he surfce fer he firs bounce? A. A B. B C. C D. D 7. A bll is roppe from res ime = on o horizonl surfce from which i rebouns. Which one of he following grphs bes shows he riion of spee of he bll wih ime from he ime = o he ime h he bll lees he surfce? A. B. C. D. 3

4 8. The igrm below shows he riion wih ime of he elociy of n objec. The re beween he line of he grph n he ime-xis represens A. he erge elociy of he objec. B. he isplcemen of he objec. C. he impulse cing on he objec. D. he work one on he objec. 9. The igrm below shows he riion wih ime of he elociy of n objec. Which one of he following grphs shows he riion wih ime of he ccelerion of he objec? A. B. C. D. 4

5 1. The grph below shows he riion wih ime of he isnce moe by cr long srigh ro. During which ime inerl oes he cr he is grees ccelerion? isnce moe A B C D ime 11. The minue hn of clock hung on ericl wll hs lengh L. P L The minue hn is obsere he ime shown boe n hen gin, 3 minues ler. Wh is he isplcemen of, n he isnce moe by, he en P of he minue hn uring his ime inerl? isplcemen isnce moe A. 2L ericlly ownwrs πl B. 2L ericlly upwrs πl C. 2L ericlly ownwrs 2L D. 2L ericlly upwrs 2L 5

6 12. The riion wih ime of he spee of cr moing long srigh ro is shown below. S S S Which re, S 1, S 2 or S 3, or combinion of res, represens he ol isnce moe by he cr uring he ime h is spee is reucing? A. S 1 B. S 3 C. S 1 + S 3 D. S 1 + S 2 + S A bll is hel res in ir. The bll is hen relese. Which one of he following grphs bes shows he riion wih ime of he isnce fllen by he bll? A. B. C. D. 6

7 14. A cr cceleres uniformly from res. I hen coninues consn spee before he brkes re pplie, bringing he cr o res. Which of he following grphs bes shows he riion wih ime of he ccelerion of he cr? A. B. C. D. 15. Four crs W, X, Y n Z re on srigh ro. The grph below shows he riion wih ime of he isnce s of ech cr from fixe poin. s X W Y Z Which cr hs he grees spee? A. W B. X C. Y D. Z 7

8 16. The grph below shows he riion wih ime of he ccelerion of spceship. T The spceship is res =. The she re represens A. he isnce relle by he spceship beween = n = T. B. he spee of he spceship = T. C. he re which he spee of he spceship chnges beween = n = T. D. he re which he ccelerion chnges beween = n = T. 17. Two sones, X n Y, of ifferen mss re roppe from he op of cliff. Sone Y is roppe shor ime fer sone X. Air resisnce is negligible. Whils he sones re flling, he isnce beween hem will A. ecrese if he mss of Y is greer hn he mss of X. B. increse if he mss of X is greer hn he mss of Y. C. ecrese wheher he mss of X is greer or less hn he mss of Y. D. increse wheher he mss of X is greer or less hn he mss of Y. 18. The grph below shows he riion wih ime of he isplcemen s of cr. In which ime inerl is he spee grees? s A B C D 8

9 19. A bll is hrown ericlly upwrs from he groun. The grph shows he riion wih ime of he ericl isplcemen of he bll. D T Which one of he following gies he finl isplcemen fer ime T n he erge spee beween ime = n ime = T? Displcemen Aerge spee A. B. 2D T C. 2D 2D T D. 2D 2. The grph below shows how quniy y ries wih ime for flling objec. y Which one of he following quniies coul be represene by y? A. Spee when ir resisnce is negligible B. Spee when ir resisnce is no negligible C. Disnce moe from res when ir resisnce is negligible D. Disnce moe from res when ir resisnce is no negligible 9

10 21. A bll is hrown ericlly upwrs ime =. Air resisnce is no negligible n he ccelerion of free fll is g. The bll reches mximum heigh ime = T n hen escens, reching erminl spee. Which grph bes shows he riion wih ime of he ccelerion of he bll? A. g B. g T T g g C. g D. g T T g g 22. The grph below shows he riion wih ime of he isplcemen of boy moing long srigh-line. Which grph bes represens he riion wih ime of he elociy of his boy? A. B. C. D. 1

11 23. The grph shows he riion wih ime of he ccelerion of n objec / ms / s The objec is res ime =. Which of he following is he elociy of he objec ime = 6. s? A..5 m s 1. B. 2. m s 1. C. 36 m s 1. D. 72 m s An objec is roppe from res from poin seerl hunre meres boe he surfce of he Erh ime =. The objec srikes he groun = T n ir resisnce is no negligible. Which of he following skech grphs bes shows he riion wih ime, of he spee of he objec? A. B. T T C. D. T T 11

12 25. The grph below shows he riion wih ime of he isplcemen s of n objec moing long srigh-line. s / m / s The bes esime of he insnneous spee of he objec = 2. s is A.. ms 1. B..2 ms 1. C. 5. ms 1. D. 1. ms The grph below shows he riion wih ime of he ccelerion of boy moing in srigh-line. 1 2 The she re represens A. he chnge in elociy from 1 o 2. B. he elociy 2. C. he erge elociy beween 1 n 2. D. he elociy 1. 12

13 27. The grph shows he riion wih ime of he elociy of n objec moing long srigh line. Which grph shows he riion wih ime of he ccelerion of he objec? A. B. C. D. 28. An objec is flling, in ir, owrs he Erh s surfce. Wh chnges occur in he ccelerion n in he elociy of he objec s i pproches erminl elociy? ccelerion elociy A. ecreses o zero increses coninuously B. ecreses o zero increses o consn lue C. consn increses o consn lue D. consn increses coninuously 13

14 29. A seel sphere is roppe from res in oil. Which of he following grphs bes represens he riion wih ime of he spee of he sphere? A. spee B. spee ime ime C. spee D. spee ime ime 3. The grph below shows he riion wih ime of he elociy of n objec moing on srigh-line. Which of he grphs below bes represens he riion wih ime of he ccelerion of he objec? 14

15 31. Liner moion () (b) Define he erm ccelerion. An objec hs n iniil spee u n n ccelerion. Afer ime, is spee is n i hs moe hrough isnce s. The moion of he objec my be summrize by he equions = u +, (2) s = u. 1 2 (i) Se he ssumpion me in hese equions bou he ccelerion. (ii) Derie, using hese equions, n expression for in erms of u, s n. (2) (c) The shuer spee of cmer is he ime h he film is expose o ligh. In orer o eermine he shuer spee of cmer, mel bll is hel res he zero mrk of ericl scle, s shown below. The bll is relese. The shuer of cmer is opene s he bll flls. cm scle 196 cm cmer 28 cm The phoogrph of he bll shows h he shuer opene s he bll reche he 196 cm mrk on he scle n close s i reche he 28 cm mrk. Air resisnce is negligible n he ccelerion of free fll is 9.81 m s 2. (i) Clcule he ime for he bll o fll from res o he 196 cm mrk. (2) (ii) Deermine he ime for which he shuer ws open. Th is, he ime for he bll o fll from he 196 cm mrk o he 28 cm mrk. (2) (Tol 9 mrks) 15

16 32. This quesion is bou projecile moion. A mrble is projece horizonlly from he ege of wll 1.8 m high wih n iniil spee V. V 1.8 m A series of flsh phoogrphs re ken of he mrble. The phoogrphs re combine ino single phoogrph s shown below. The imges of he mrble re superimpose on gri h shows he horizonl isnce x n ericl isnce y relle by he mrble. The ime inerl beween ech imge of he mrble is.1 s. groun x / m y / m () (b) On he imges of he mrble x =.5 m n x = 1. m, rw rrows o represen he horizonl elociy V H n ericl elociy V V. On he phoogrph, rw suible line o eermine he horizonl isnce from he bse of he wll o he poin where he mrble his he groun. Explin your resoning. (2) (3) (c) Use from he phoogrph o clcule lue of he ccelerion of free fll. (3) (Tol 8 mrks) 16