Ishqalanish. Ishqalanish kuchi. Tabiatda va texnikada ishqalanish

Ekspremental topshiriq (mexanik ish) 
1. Kichkina suvli chelakni poldan ko‘tarib stul ustiga qo‘ying. Bunda bajarilgan 
ishni hisoblang. Chelakka ta’sir etuvchi og‘irlik kuchi qanday ish bajaradi? Hisobot 
tayyorlang, ishni hisbolash uchun qanday asboblardan foydalandingiz, qanday 

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o‘lchov va hisob-kitoblarni amalga oshirdingiz, qanday natijalarga erishganligingiz 
ko‘rsating.
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Foydali ish koeffitsienti 
1. Istalgan mexanizm, mashina bajargan umumiy ish nimadan tashkil topgan? 
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2. Nima uchun sirpanish ishqalanish kuchini engishda bajarilgan ish foydasiz 
bo‘ladi? 
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3. FIK qanday aniqlanadi? 
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4. Shu mavzuda keltirilgan misollarni ko‘rib chiqib, FIK ni qanday oshirish 
bo‘yicha maslahat bering?
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5. FIK 100 % bo‘lishi mumkinmi? 
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6. Blokdan foydalanganda foydali ish 750 J, umumiy ish esa 1 kJ ni tashkil 
qiladi. Blok FIK ni toping? 
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7. Qiya tekislik yordamida yuk ma’lum bir balandlikka ko‘tariladi. Qiya 
tekislikning FIK i 75% ni tashkil qiladi. Bu nimani anglatadi? 
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8. FIK i η = 80 % bo‘lgan nasos A
u
= 4, 2 kJ umumiy ish bajardi. Foydali 
ishning qiymatini aniqlang. 
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9. FIK I η = 70 % bo‘lgan ko‘tarma kran bir qancha vaqt ishlaganda bajarilgan 
foydali va umumiy ishning qiymatini aniqlang, agar bu vaqtdagi foydasiz ishning 
qiymati A=1,5 MJ ni tashkil qilsa. 
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10. Foydali ishining qiymati foydasiz ishining qiymatidan 8 marta katta bo‘lgan 
qurilmaning FIK ni aniqlang. 
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11. Lift ko‘targichining FIK bir yoki bir necha odamni ko‘targanda bir xil 
bo‘ladimi? Nima uchun? 
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12. Agar liftda umumiy massasi m= 300 kg bo‘lgan to‘rt odam ko‘tarilayotgan 
bo‘lsa, lift ko‘targichining maksimal FIK ning qiymati qancha bo‘lishi mumkin? 
Bo‘sh kabinaning massasini m
1
=60 kg ga teng deb qabul qiling. 
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13. s=10 m yo‘lda sport chanasi tezlashganda, sportchilar tomonidan A
u
=2 kJ 
umumiy ish bajarildi. Tezlanishga qarshilik qiluchchi ishqalanish kuchini o‘zgarmas 
va F
i
=20 N ga teng deb hisoblab, qaralayotgan holatdagi FIK ning qiymatini 
aniqlang. 
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14. Rasmda ikki har xil ko‘targichlar yordamida 
bir xil massali yuklarni ko‘tarishdagi ishqalanish 
kuchlarining 
halandlikka 
bog‘liqlik 
grafigi 
keltirilgan. Bo‘yalgan va shtrixlangan yuzalarni 
baholab, qanday axborotni olish mumkin? Berilgan 
ko‘targichlarning foydali ish koeffitsientini, bu 
yuzalar yordamida taqqoslash mumkinmi?
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15. Rasmda ikki ko‘targich yordamida, bir hil 
massali yuklarni aynan bir xil balandlikka ko‘tarishdagi 
ishqalanish kuchining yo‘lga bog‘liqlik grafiklari 
berilgan. Ko‘targichlar ishlarining samaradorliklari bir 
xil bo‘lganmi? Javobingizni dalillar keltirib isbotlang.
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