Zamkati
Mu fizikiya amatchedwantchito yamakina komwe kumapangitsa mphamvu pachinthu, kutha kukhudza malo ake kapena kuchuluka kwa mayendedwe ake. Ntchito yamakina ndi kuchuluka kwa mphamvu zofunikira kuti chinthu chiziyenda, amasintha mawonekedwe amomwe akusunthira, kapena kuyimitsa.
Monga ntchito zina zakuthupi, nthawi zambiri zimaimiridwa ndi chilembo W (kuchokera ku ChingereziNtchito) ndipo nthawi zambiri amayeza mu joules, gawo loyesera mphamvu. Joule imodzi ndiyofanana ndi ntchito yochitidwa ndi mphamvu 1 Newton pathupi loyenda mita imodzi kulowera ndi kulunjika kwa mphamvu yoyamba.
Ngakhale kukakamiza ndi kusamutsidwa kuli ma vekitala ambiri, opatsidwa luntha ndi kuwongolera, ntchito ndi yochuluka kwambiri, ilibe chitsogozo kapena mphamvu (monga zomwe timatcha "mphamvu").
Pamene mphamvu yogwiritsidwa ntchito pathupi ili ndi malangizo amodzimodzi ndi kusuntha kwake, ntchitoyi imanenedwa kuti ndiyabwino. M'malo mwake, ngati mphamvuyo imagwiritsidwa ntchito mosemphana ndi njira yosamutsira anthu, ntchitoyo imadziwika kuti ndi yolakwika.
Ntchito yamakina imatha kuwerengedwa molingana ndi chilinganizo:
W(ntchito mu joules)= F(mphamvu mu newtons). d(Mtunda wa mita).
- Onaninso: Mfundo zochita ndi kuchitapo kanthu
Zitsanzo za ntchito yamakina
- Gome likukankhidwa kuchokera kumapeto kwa chipinda chimodzi.
- Amakoka khasu ng'ombe kumunda wachikhalidwe.
- Windo lotsegula limatseguka ndimphamvu zonse mpaka kumapeto kwa njanji yake.
- Galimoto imakankhidwa mafuta atha.
- Njinga imathandiza popanda kukwera pa icho kuti muchite.
- Khomo limakokedwakulowa m'malo.
- Galimoto imodzi imakokedwa ndi ina kapena ndi crane yomwe imamukoka ndikuyiyika.
- Kukwawa winaa mikono kapena mapazi.
- Piyano imakwera mlengalenga ndi makina azingwe ndi pulleys.
- Chidebe chimakwezedwa odzazidwa ndi madzi kuchokera pansi pa chitsime.
- Amasonkhanitsidwa pansibokosi lodzaza ndi mabuku.
- Katundu amakoka a sitima, pokoka kutsogolo kwa sitima yapamtunda.
- Khoma lagwetsedwa ndi chojambula champhamvu kwambiri kapena galimoto.
- Imakoka chingwendipo kumapeto ena pali anthu ena akumukoka (cinchado).
- Zimachitika kupambana kuthana ndi mphamvu yomwe wotsutsana amagwiritsa ntchito mbali ina.
- Kulemera kumachotsedwa nthaka, monga amachitira othamanga Olimpiki.
- Ngolo imakokedwa ndi mahatchi, monga omwe adagwiritsidwa ntchito kale.
- Bwato lamoto limakokedwa ndi mota wakunja, zomwe zimapangitsa kuti ziziyenda bwino pamadzi.
Zitsanzo zolimbitsa thupi
- Thupi la 198 kg limatsitsidwa kutsika, likuyenda ma 10 mita. Kodi thupi limagwira ntchito yanji?
Kusintha: Popeza kulemera ndi mphamvu, njira yogwiritsira ntchito makina imagwiritsidwa ntchito ndipo zimapezeka kuti: W = 198 Kg. 10 m = 1980 J
- Kodi thupi X lifunikira mphamvu zingati kuti liyende mita 3 kuchita ma joule 24 antchito?
Kusintha: Monga W = F. d, tili ndi: 24 J = F. 3m
chifukwa chake: 24J / 3m = F
y: F = 8N
- Zingakhale ndalama zingati kuti munthu akakanize bokosi lazitsulo ndi 2 mita, kugwiritsa ntchito mphamvu ya 50 N?
Kusintha: W = 50 N. 2m, ndiye: W = 100 J
- Pitirizani ndi: Makina osavuta
