Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish
Download 1.87 Mb. Pdf ko'rish
|
7-sinf BSB va ChSB bazasi
- Bu sahifa navigatsiya:
- Mexanik energiyaning saqlanish qonuni
|
1
=0,8 m balandlikda stol ustida yotibdi. Kubning potensial energiyasini: a) polga nisbatan aniqlang; ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ b) stolga nisbatan aniqlang. ____________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ c) Kubni poldan stolga ko‘tarish uchun qancha ish bajarish kerak? g=10 N/kg. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Mexanik energiyaning saqlanish qonuni 1. Ko‘tarilgan jismning potentsial energiyasi haqida gapirish yoki “jism – Yer” tizimining potentsial energiyasi haqida gapirish to‘g‘riroqmi? ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ 2. Mexanik energiyaning saqlanish qonunining mohiyati nimada? ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ 3. Rasmda ko‘rsatilgan tajribada nima uchun metall sharchani ishlatmadik? Bu yerda qanday zichlikli metall afzalroq? Nima uchun? 4. Ipga osilgan sharchaning tebranish vaqtidagi energiya aylanishini tasvirlang (rasmga.q). ___________________________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ 5. To‘liq mexanik energiya: a) to‘pning katta bo‘lmagan balandlikdan tushishi vaqtida; ______________________________________________________________ ______________________________________________________________ b) to‘pning katta balandlikdan tushishi vaqtida; ______________________________________________________________ ______________________________________________________________ c) parashutchining ochilgan parashut bilan tushish vaqtida saqlanadimi? ______________________________________________________________ ______________________________________________________________ 6. Agar prujinali pistalet stvolini a) gorizontal; ______________________________________________________________ ______________________________________________________________ b) vertikal o‘rnatilsa, undan otilib chiqadigan sharchaning tezligi bir xil bo‘ladimi? ______________________________________________________________ ______________________________________________________________ 7. “Ish. Quvvat. Energiya, Oddiy mexanizmlar” bo‘limidagi 1, 2 interfaol modellardan foydalanib, mexanik energiyaning saqlanish qonunini bajarilishini ko‘rsating. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 8. Jismning ma’lum balandlikdagi potentsial energiyasi 400 J. Jism shu balandlikdan qo‘yib yuborildi. Jismning potentsial energiyasi 150 J ga teng bo‘lgan vaqtda uning kinetik energiyasi qanday bo‘ladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 9. Jism vertikal yuqoriga otish uchun unga 300 J kinetik energiya beradi. Qandaydir balandlikda jismning kinetik energiyasi 120 J ga kamayadi. Bu balandlikda jismning potensial energiyasi qanday bo‘ladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 10. ϑ=20 m/s tezlik bilan vertikal yuqoriga otilgan, m=0,2 kg massali tosh qanday maksimal balandlikka ko‘tarilishi mumkin? Havoning qarshiligini hisobga olmang. Bu va bundan keyingi masalalarda g=10 N/kg ga teng deb qabul qiling. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 11. h=10 m balandlikka ega uyning balkonidan m=0,5 kg massali rezina gilamcha tushib ketdi. Yer sirtida uning harakat tezligi ϑ=10 m/s bo‘ldi. Mexanik energiya saqlanadimi? Nima uchun? Bu masalani hamma ma’lumotlardan foydalanmasdan yeching. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 12. m=0,3 kg massali olma ϑ=8 m/s tezlik bilan vertikal yuqoriga otildi. Uning h=1 m balandlikdagi to‘liq, kinetik va potensial energiyalarini hisoblang. Havoning qarshiligini hisobga olmang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 13. Vertikal yuqoriga otilgan tosh h=20 m balandlikka ko‘tarildi. Unga 2 marta katta boshlang‘ich tezlik berilsa, u qancha balandlikka ko‘tariladi? Havoning qarshiligini hisobga olmang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 14. h=20 m balandlikli tog‘ cho‘qqisida, chang‘ida tursangiz, qancha potensial energiyaga ega bo‘lasiz? Agar hamma potensial energiya kinetik energiyaga aylangan bo‘lsa, tog‘dan tushish oxirida siz qancha harakat tezligiga ega bo‘lardingiz? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 15. Sharcha ϑ=20 m/s tezlik bilan Yer sirtidan vertikal yuqoriga otildi. Yer sirtidan qanday balandlikda sharchaning tezligi 2 marta kamayadi? Havoning qarshiligini hisobga olmang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 16. Massasi 500 g bo‘lgan tosh 20 m/s tezlik bilan vertikal yuqoriga otildi. 10 m balandlikdagi toshning kinetik va potensial energiyalarini aniqlang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 17. 20 m balandlikda tinch turgan jism erkin tusha boshladi. Jismning tezligi qanday balandlikda 10 m/s bo‘ladi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 18. To‘p vertikal yuqoriga 8 m/s tezlik bilan otildi. Qanday balandlikda to‘pning tezligi ikki baravar kamayadi. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 19. Rasmda massasi 4 tonna bo‘lgan yuk mashinasi tezligining vaqtga bog‘lanish grafigi ko‘rsatilgan. Harakat boshidan 15 s vaqt o‘tgandan keyin yuk mashinasining kinetik energiyasini hisoblang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 20. Sirk tomoshasi paytida og‘irligi 3 tonna bo‘lgan fil 50 cm balandlikdagi zinaga ko‘tarildi va og‘irligi 80 kg bo‘lgan murabbiyi gumbaz ostida besh qavatli binoning balandligiga teng bo‘lgan balanglikka (15 m) ko‘tarildi. Ulardan qaysi biri eng ko‘p potentsial energiyaga ega bo‘ladi? Filmi yoki hayvonlarni o‘rgatuvchimi? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 21. Dastlabki holatda yuklar (rasmga.q) tinch turibdi. Agar yuklar qo‘yib yuborilsa, yuklarning umumiy p otentsial energiyasi qanday o‘zgaradi (ortadi yoki kamayadi)? Yuklarning kinetik energiyasi qanday o‘zgaradi? Ishqalanishni hisobga olmang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Download 1.87 Mb. Do'stlaringiz bilan baham: 
|