Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish
Download 1.87 Mb. Pdf ko'rish
|
7-sinf BSB va ChSB bazasi
Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish 1. Ishqalanish kuchlarining yuzaga kelish sabablarini yozing. _______________________________________________________________ _______________________________________________________________ 2. Avtomobil tezlanish bilan harakat qilayotganda unga ta’sir etuvchi ishqalanish kuchining yo‘nalishi qanday bo‘ladi? _______________________________________________________________ 4. Tinchlikdagi ishqalanish yuzaga keluvchi holatlarga misollar keltiring. _______________________________________________________________ _______________________________________________________________ 5. Texnik qurilmalarda ishqalanish kuchi qanday kamaytiriladi? _______________________________________________________________ _______________________________________________________________ 6. Ishqalanish kuchini qanday oshrish mimkin? _______________________________________________________________ _______________________________________________________________ 7. Stol yuzasida harakatsiz turgan kitobga ishqalanish kuchi ta’sir qiladimi? _______________________________________________________________ _______________________________________________________________ 8. Yong‘oqni ochish uchun siz kuch ishlatasiz. Nega gayka burab qo‘yilgan vint moylangan bo‘lsa, shuncha oson chiqib ketadi ya’ni gayka shuncha oson yechiladi? _______________________________________________________________ _______________________________________________________________ 9. Stolda tinch turgan brusokka dinamometr yordamida 3 N gorizontal yo‘nalishda kuch ta’sir qiladi. Brusok kuch yo‘nalishi bo‘yicha tekis harakatlanadi. a) Bruskka qanday ishqalanish kuchi ta’sir qiladi? _______________________________________________________________ b) Dinamometr 2 N ko‘rsatsa, brusok qanday harakatlanadi va ishqalanish kuchi qanday bo‘ladi? _______________________________________________________________ 10. Rasmda gorizontal sirtda jismlarning harakat yo‘nalishi ko‘rsatilgan. Har bir jismga ta’sir etuvchi ishqalanish kuchining yo‘nalishini ko‘rsating. 11. Rasmda jismlarning qiya tekislik bo‘ylab harakat yo‘nalishi ko‘rsatilgan. Har bir jismga ta’sir etuvchi ishqalanish kuchining yo‘nalishini ko‘rsating. 12. Massasi 80 kg bo‘lgan parashyutchi o‘zgarmas tezlikda pastga tushadi. Havo parashyutga qanday qarshilik kuchi bilan ta’sir qiladi? Parashyutchiga ta’sir qiluvchi kuchlarni chizing. 13. Rasmda ko‘rsatilgan vaziyatlarda ishqalanishning qanday turlari ta’sir qiladi? _______________________________________________________________ _______________________________________________________________ 14. Rasmga qarang va javob bering: ishqalanishning zararli va foydali ta’sirini izohlab bering. _______________________________________________________________ _______________________________________________________________ 15. Stolga bir xil yuklar ikki xil usulda joylashtiriladi (rasm q). Stol yuzasida yuklarning tekis harakatlanishi uchun bir xil kuchlar bilan ta’sir qilish kerakmi? a) _____________________________________________________________ b) _____________________________________________________________ 16. Shkafni siljitishga harakat qilib, unga asta-sekin ortib borayotgan gorizontal yo‘nalishda kuch ta’sir qiladi. Kuch 175 N ga yetganida shkaf harakatlana boshladi. a) Shkaf va pol orasidagi ishqalanish kuchi qanday o‘zgargan? _______________________________________________________________ b) Agar siz kuchni oshirishda davom etsangiz nima sodir bo‘ladi? _______________________________________________________________ c) Shkafning massasi 70 kg bo‘lsa, shkaf bilan pol orasidagi sirpanish ishqalanish koeffitsiyenti qanday bo‘ladi? _______________________________________________________________ 17. Bikirligi 96 N/m bo‘lgan ip yordamida stol sirti bo‘ylab 2,4 kg og‘irlikdagi brusok bir xil tezlikda tortiladi. Brusok va stol sirti orasidagi ishqalanish koeffitsiyenti 0,2 bo‘lsa, prujinaning cho‘zilishi aniqlang. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 18. Jadvalni to‘ldiring. 19. Agar chananing og‘irligi 4 kN, muz bilan chana orasidagi ishqalanish koeffitsiyenti 0,03 bo‘lsa, chanani muz ustida tekis harakatlantirish uchun gorizontal yo‘nalishda qanday kuch bilan tortish kerak? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 20. Chananing qor ustida tekis harakatlanishi uchun 25 N gorizontal yo‘nalishda kuch ta’sir qiladi. Chananing bilan qor orasidagi ishqalanish koeffitsiyenti 0,05 bo‘lsa, chananing massasini aniqlang. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 21. Massasi 10 kg bo‘lgan brusok gorizontal yo‘nalishda 15 N kuch ta’sirida sirt bo‘ylab o‘zgarmas tezlikda harakat qiladi. Brusok va sirt orasidagi ishqalanish koeffitsiyentini aniqlang. _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 22. Stol sirti bo‘ylab gorizontal yo‘nalishda 5 N kuch bilan brusok tortilganda, brusok tekis harakatlanadi. Brusokka qanday ishqalanish kuchi ta’sir qiladi? Tinch turgan brusokka kuch ta’sir qilsa, ishqalanish kuchi qanday bo‘ladi: _______________________________________________________________ _______________________________________________________________ a) agar 3 N kuch ta’sir qilsachi ______________________________________ _______________________________________________________________ _______________________________________________________________ b) agar 10 N kuch ta’sir qilsachi _____________________________________ _______________________________________________________________ _______________________________________________________________ 23. Massasi 2 kg bo‘lgan brusok stol ustida yotibdi, brusok va stol orasidagi ishqalanish koeffitsiyenti 0,3 ga teng. Agar unga gorizontal yo‘nalishda: a) 4 N kuch ta’sir qilsa, brusokka qanday ishqalanish kuchi ta’sir qiladi _______________________________________________________________ _______________________________________________________________ b) 8 N kuch ta’sir qilsa, brusokka qanday ishqalanish kuchi ta’sir qiladi _______________________________________________________________ _______________________________________________________________ c) 12 N kuch ta’sir qilsa, brusokka qanday ishqalanish kuchi ta’sir qiladi _______________________________________________________________ _______________________________________________________________ 24. Massasi 1,2 kg bo‘lgan brusokka bikirligi 40 N/m bo‘lgan prujina yordamida stol ustida tekis harakatlantirldi. Brusok va stol orasidagi ishqalanish koeffitsiyenti 0,3 ga teng bo‘lsa, prujinaning cho‘zilishi qanday bo‘ladi? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Download 1.87 Mb. Do'stlaringiz bilan baham: |
Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©fayllar.org 2024
ma'muriyatiga murojaat qiling
ma'muriyatiga murojaat qiling