Jismning tezligi tufayli EGA bo’ladigan energiyasi deb ataladi

12. Agar bola 10 minutda 1800 J ish bajarsa, uning foydali quvvati nimaga teng ?
A) 30 W B) 180 W C) 3 W D) 18 kW
13. Jismga ta’sir etuvchi kuch va jism ko’shishi orasidagi burchak necha gradus bo’lganda mexanik ish bajarilmaydi ?
A) 90 ̊ dan katta B) 90 ̊ dan kichik C) 180 ̊ D) 90 ̊
14. Gapni to’ldiring: “ 1 J – bu, 1 N kuch ta’sirida jismni .... masofaga ko’chirishda bajarilgan ishga teng. “
A) ...1 m .... B) ... ixtiyoriy... C) .... 1 km .... D) .... 1 sm ...
15. Ot aravani 1 km masofaga tortib borishda 220 kJ ish bajarildi. Ot aravani qanday kuch bilan tortgan ? A) 22 N B) 220 kN C) 220 N D) 110 N
16. “ Energiya ” so’zinin ozbekcha ma’nosini aniqlang
A) harakat B) imkoniyat C) faollik D) turtki
17.Impulsi 2,7kg ∙ m/sbo’lgan koptokning massasi 0,3 kg bo’lsa, uning tezligi nimaga teng?
A) 9 m/s B) 0,7 m/s C) 14 m/s D) 10,9 m/s
18. Jism yuqoriga ko’tarilishda kinetik energiyasi qanday o’zgaradi ?
A) ortadi B) kamayadi C) o’zgarmaydi D) avval ortib keyin o’zgarmaydi
19. Massasi 2 kg bo’lgan jismning 6 m balandlikdagi potensial energiyasi qanchaga teng (g=10 m/s² ) ? A) 240 J B) 32 J C) 9,8 J D) 120 J
20. 100 kW necha W ga teng ? A) 10 ⁶ B) 10 ⁷ C) 10 ^{- 5} D) 10 ⁵
21. Jism yuqoridan pastga tushayotganda bajarilgan ish musbatmi, manfiy ? _________
22. Kinetik energiya hisobidan bajarilgan ish formulasini yozing __________________
23. Jism Yerdan tik yuqoriga otilganda uning qanday turdagi energiyasi kamayib
boradi ? _______________________________
24. “ Yopiq sistemaning to’liq mexanik energiyasi sistema qismlarining har qanday harakatida o’zgarmaydi.” Bu qonun qanday ataladi ? ____________________________
25. 1 s vaqt ichida 1 J ish bajaradigan qurilmaning quvvati qanchaga teng ?
Javoblar:

№		№		№
1	B	8	B	15	C
2	A	9	B	21	Musbat
3	D	10	C	22	A=mv2^2/2- mv1^2/2
4	A	11	B	23	kinetik
5	D	12	C	24	Energiya. saq.qonuni
6	D	13	D	25	1W
7	A	14	A

№
16	C
17	A
18	C
19	d
20	D