Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish
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1. Qo‘llaringizga bir varaq qog‘oz oling va biror balandlikdan qo‘yib yuboring. Uning tushishini kuzating. Endi bu varaqni g‘jimlab yani yumoloq qilib qo‘yib yuboring (rasmga. q). Uning tushishi qanday o‘zgaradi? Nega? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 2. Qanday ishqalanish sodir bo‘lishini tajriba bilan tekshiring: a) yurganda yoki yugurganda; ______________________________________________________________ ______________________________________________________________ b) qo‘lingizda og‘ir narsalarni ushlab turganda; ______________________________________________________________ ______________________________________________________________ c) tog‘dan chanada tushayotganizda; ______________________________________________________________ ______________________________________________________________ d) asfaltda rolikli konkida uchayotganingizda. ______________________________________________________________ ______________________________________________________________ 3. Hech bir ishqalanishni kamaytirish yoki oshirish choralarini ko‘rganmisiz? Tegishli tajribalarni bajaring va jadvalni to‘ldiring. O‘zingiz xulosa chiqaring. Ishqalanishni kamaytirish Ishqalanishni oshirish 4. Stol ustida ikki holat bo‘yicha uchta bir xil yog‘ach brusok harakatlanmoqda. Har bir holat bo‘yicha ishqalanish kuchini dinamometr bilan o‘lchang: a) brusoklarni ustma-ust holatida; ______________________________________________________________ ______________________________________________________________ b) brusoklarni bir-biriga biriktirilgan (rasmga qarang). ______________________________________________________________ ______________________________________________________________ Tajribadan qanday xulosa chiqarish mumkin? ______________________________________________________________ ______________________________________________________________ 5. Ishqalanish kuchi jismning og‘irligidan oshib ketishini tajriba orqali tekshirishga harakat qiling. Buning uchun sizga nima kerak? ______________________________________________________________ ______________________________________________________________ 6. Stolga bir nechita kitoblarni ustma-ust qo‘ying. Boshqalarini ushlab (lekin ko‘tarmasdan!) pastki kitobni tortib olishga nisbatan barcha kitoblarni siljitish osonroq ekanligini bilib oling. ______________________________________________________________ ______________________________________________________________ 7. Dinamometr yordamida har xil materialdan tayyorlangan brusokning gorizontal sirtdagi harakati paytida ishqalanish kuchining sirt yuzasiga bog‘liqligini tekshiring. Barcha bursoklarning yuzlari bir xil. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 8. Turli materiallardan bir xil o‘lchamdagi ikkita brusokni oling. Dinamometr yordamida har bir brusokning stol ustida tekis harakatidagi sirpanish ishqalanish kuchini va tinchlikdagi ishqalanish kuchini o‘lchang. O‘lchov natijalarini solishtiring. Qanday xulosa chiqarish mumkin? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 9. Prujina yoki rezina ipdan foydalanib, brusok va stol orasidagi ishqalanish koeffitsientini o‘lchang. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 10. Yaroqsiz tennis yoki kauchuk to‘pda kichik teshik hosil qiling. To‘pni suv bilan to‘ldiring va uni (aylantirmasdan) vertikal ravishda yuqoriga tashlang. Tushish paytida suv to‘kiladimi? Kuzatilgan hodisani tushuntiring. ______________________________________________________________ ______________________________________________________________ Download 1.87 Mb. Do'stlaringiz bilan baham: 
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