Ukunyakaza okuqondile - izinkinga nezixazululo
1. Ibhola A liphonsa phezulu liqonde phezulu ngesivinini esingu -10 m/s. Ngemva komzuzwana owodwa, lisuka endaweni efanayo, iBhola B liphonswa phezulu liqonde phezulu endleleni efanayo, ngesivinini esingu-25 m/s. Lingakanani ukuphakama kwebhola B uma lihlangana nebhola A.
Isixazululo:
Ekuxazululeni inkinga yokunyakaza okuqondile , inani levektha eliqondiswe phezulu linikezwa uphawu oluhle, inani levektha eliqondiswe phansi linikezwa uphawu olubi.
Kwaziwa:
Isivinini sokuqala (v o ) sebhola A = 10 m/s
Isikhawu sesikhathi (t) sebhola A = x
Isivinini sokuqala (v o ) sebhola B = 25 m/s
Isikhawu sesikhathi (t) sebhola B = x – 1
Ukusheshisa ngenxa yamandla adonsela phansi (g) = -10 m/s 2 (kunikezwe uphawu lokususa ngoba isiqondiso samandla adonsela phansi siphansi)
Okufunwayo: Ukuphakama kwebhola B uma lihlangana nebhola A (h)
h A = h B
i - vot + ½ gt 2 = i - vot + ½ gt 2
10x + ½ (-10) x 2 = 25 (x-1) + ½ (-10) (x-1) 2
10x – 5x 2 = 25 (x-1) – 5 (x-1) 2
10x – 5x 2 = 25x – 25 – 5 (x 2 -2x+1)
10x – 5x 2 = 25x – 25 – 5x 2 + 10x – 5
10x – 5x 2 – 25x + 25 + 5x 2 – 10x + 5 = 0
– 5x 2 + 5x 2 + 10x – 25x – 10x + 25 + 5 = 0
10x – 25x – 10x + 25 + 5 = 0
– 25x + 25 + 5 = 0
- 25x + 30 = 0
– 25x = – 30
x = -30/-25
x = 1.2 imizuzwana
Ibhola A lisemoyeni ngaphambi kokuba lihlangane nebhola B = imizuzwana eyi-1.2
Isikhathi esiphakathi ibhola B emoyeni ngaphambi kokuba lihlangane nebhola A = imizuzwana eyi-1.2 – imizuzwana eyi-1 = imizuzwana eyi-0.2.
Ukuphakama kwebhola A uma lihlangana nebhola B:
h = vot + ½ gt 2 = (10)(1.2) + 1/2 (-10)(1.2) 2 = 12 – 5(1.44) = 12 – 7.2 = 4.8 imitha s
Ukuphakama kwebhola B uma lihlangana nebhola A:
h = vot + ½ gt 2 = (25)(0.2) + 1/2 (-10)(0.2) 2 = 5 – 5(0.04) = 5 – 0.2 = 4.8 imitha s
1. Umbuzo: Kusho ukuthini ukunyakaza okuqondile?
Impendulo: Ukunyakaza okuqondile kubhekisela ekuhambeni kwento phezulu noma phansi, ngokuvamile ngaphansi kwethonya lamandla adonsela phansi.
2. Umbuzo: Ukusheshisa okubangelwa amandla adonsela phansi (g) kubaluleke kanjani ekunyakazeni okuqondile?
Impendulo: Zonke izinto eziseduze nobuso boMhlaba zithola ukusheshisa okuqhubekayo, , okungaba ngu-9.81 m/s² phansi.
3. Umbuzo: Ingabe into ingaba nesivinini sokuqala ekunyakazeni okuqondile?
Impendulo: Yebo, izinto zingaba nesivinini sokuqala sokuya phezulu noma phansi lapho ukunyakaza kwazo okuqondile kuqala.
4. Umbuzo: Kwenzekani ngejubane lento ewa ngokukhululeka?
Impendulo: Ijubane lento ewa ngokukhululeka likhuphuka cishe ngama-9.81 m/s njalo ngomzuzwana ngenxa yamandla adonsela phansi oMhlaba.
5. Umbuzo: Isikhathi sokukhuphuka sihlobene kanjani nesikhathi sokuhla kwento ephonswe iqonde phezulu?
Impendulo: Entweni ephonswe phezulu bese ivunyelwa ukuthi iwele phansi, isikhathi sokukhuphuka silingana nesikhathi sokuhla.
6. Umbuzo: Ingakanani ijubane lento ekuphakameni kwayo okuphezulu?
Impendulo: Ekuphakameni okuphezulu, ijubane eliqondile lento liba yi-zero ngaphambi kokuba iqale ukwehla.
8. Umbuzo: Ukumelana nomoya kuthinta kanjani ukunyakaza okuqondile?
Impendulo: Ukumelana nomoya kuphikisana nokunyakaza, kunciphisa ukusheshisa kanye nesivinini sokugcina sezinto eziwayo.
9. Umbuzo: Kuyini ijubane lokugcina?
Impendulo: Ijubane le-terminal yijubane eliphakeme elingaguquki elifinyelelwa yinto ewayo lapho ukumelana nomoya kulingana namandla adonsela phansi.
10. Umbuzo: Ingabe into ingaba nokusheshisa okungekuhle ngesikhathi sokunyakaza okuya phezulu?
Impendulo: Yebo, uma into ihambela phezulu ngokumelene namandla adonsela phansi, iba nokusheshisa okungekuhle okulingana no-g.
12. Umbuzo: Kungani ukusheshisa kungeyona into ephambene nezinto eziphonswe phezulu?
Impendulo: Ngenxa yokuthi ukusheshisa ngenxa yamandla adonsela phansi kwehla, kubhekwa njengokubi ezintweni ezihamba ngakolunye uhlangothi.
14. Umbuzo: Kuyini ukuwa okukhululekile?
Impendulo: Ukuwa okukhululekile ukunyakaza kwento ngaphansi kwethonya lamandla adonsela phansi kuphela, kungekho amanye amandla asebenzayo kuyo.
15. Umbuzo: Ukunyakaza kwento kuhluka kanjani uma iphonswa phansi uma kuqhathaniswa nalapho iphonswa?
Impendulo: Zombili zithola ukusheshisa ngenxa yamandla adonsela phansi. Kodwa-ke, into ephonswe phansi inejubane lokuqala elengeziwe, okwenza ifike phansi ngokushesha kuneyodwa evele yawa.
16. Umbuzo: Yiziphi izici ezithinta ijubane lokugcina lento?
Impendulo: Izici zifaka phakathi isisindo sento, ukuma kwayo, indawo yayo, kanye nobukhulu bayo kanye nokuthamba kwayo.
17. Umbuzo: Ingabe into enyakazayo inamandla e-kinetic kanye ne-potential?
Impendulo: Yebo, amandla e-kinetic ento ayanda njengoba iwela, kuyilapho amandla ayo angase anciphe, futhi okuphambene nalokho ngesikhathi sokukhuphuka.
18. Umbuzo: Kungani ijubane lento lishintsha ngesikhathi sokunyakaza okuqondile?
Impendulo: Amandla adonsela phansi abangela ukusheshisa okuqhubekayo, okushintsha ijubane lento kuze kube yilapho ifika ejubaneni lokugcina noma ishintsha isiqondiso.
19. Umbuzo: Ingabe ukunyakaza okuqondile kungachazwa njengokunyakaza okusheshiswa ngokulinganayo?
Impendulo: Yebo, uma kungekho ukumelana nomoya, ukunyakaza okuqondile ngaphansi kwamandla adonsela phansi kusheshiswa ngokulinganayo ngokusheshisa okungu- .
20. Umbuzo: Umgomo wokulondolozwa kwamandla usetshenziswa kanjani ekunyakazeni okuqondile?
Impendulo: Isamba samandla e-kinetic kanye namandla angase abe khona sihlala singaguquguquki ngesikhathi sokunyakaza okuqondile, kucatshangelwa ukuthi akukho ukulahlekelwa kwamandla ngenxa yokumelana nomoya.
Ukuqonda ukunyakaza okuqondile kubalulekile kuma-mechanics akudala futhi kunezinhlelo zokusebenza ezingokoqobo kusukela kwisayensi yezemidlalo kuya emithethweni yobunjiniyela kanye nokuphepha.
