4. 2-mavzu: Fizika fanidan 7-sinf darsliklaridagi laboratoriya ishlarini o‘tkazish metodikasi. Reja

Laboratoriya ishi: Jismni ko‘tarishda va shu masofaga gorizontal ko‘chirishda bajarilgan ishni hisoblash.
Ishning maqsadi: Jism vertkal va gorizontal yo`l bo`ylab ko`chirilganda bajarilgan ishni mustaqil ravishda hisoblang.
Kerakli jihozlar : Laboratoriya tribometri, o`quv dinamometri , santimetrli bo`limlarga ega bo`lgan o`lchov tasmasi, 2 dona ikkita ilmoqli 100 g massali yuk , brusok , chizg`ich.
Ishni bajarish tartibi.

1. Jihozlangan rasmda ko`rsatilgan qurilmani yig`ing.

   
   

2. Dinamometr yordamida brusok og`irligini o`lchang. So`ngra brusokni yuqoriga tekis harakatlantirib , oldindan tasma yordamida o`lchangan tribometr chizg`ichi balandligiga ko`taring. Bajarilgan ishning kattaligini quyidagi formula bilan hisoblang: A= F_og` * h

   
   

3. Tajribani uch marta takrorlang. Har tajribada brusokka 0,81 N , 1,81 N , 2,81 N yuklar osing

   
   

4. Topilgan natijani jadvalga yozing.

   
   

5. Chizg`ichni stolga qo`yib , dinamometr yordamida brusokni chizg`ich bo`ylab birinchi holdagi masofaga bir tekis ko`chiring. Bunda hosil bo`lgan tortishish kuchini dinamometr ko`rsatishi F_t dan aniqlang.

   
   

6. Ishni yana tortishish kuchi va yo`lga ko`ra hisoblang: A=F_t*s . Diqqatingizni bu ish og`irlik kuchini emas , balki ishqalanish kuchini yengishda bajarilganligiga qarating. So`ngra brusokka 0,81 N ; 1,81 N; 2,81 N yuklarni osib , tajribani uch marta takrorlang va har safar tortish kuchi bajargan ishni hisoblang. Topilgan natijalarni jadvalga yozing

   
   

№	m,kg	h,m	Fog`, N	s,m	Fish, N	Ah, j	Atek, j
1
2
3

So`ngra brusokka 1 N , 2 N , 3 N yuklarni ortib, tajribani yana 2-3 marta takrorlang va har safar totrish kuchining bajargan ishini hisoblang.

Olingan natijalarni taqqoslab hamma vaqt yukni yuqoriga ko`tarishda bajarilgan ish uni shunday masofaga gorizontal yo`l bo`ylab ko`chirishda bajarilgan ishdan kattaligini yoki kichiklagini aniqlang.