Mafomula a Ntchito, Mphamvu, ndi Momentum: Malingaliro Oyambira ndi Magwiritsidwe Ntchito
Ntchito, mphamvu, ndi mphamvu ndi mfundo zitatu zofunika kwambiri mu fizikisi zomwe zimagwira ntchito yofunika kwambiri pakumvetsetsa zochitika zosiyanasiyana zachilengedwe. M'nkhaniyi, tikambirana njira zokhudzana ndi mfundo zitatuzi ndi momwe zimagwiritsidwira ntchito pa moyo watsiku ndi tsiku.
Bizinesi (W)
Mu fizikisi, ntchito imatanthauzidwa ngati chinthu chomwe chimachokera ku mphamvu yomwe imagwira ntchito pa chinthu ndi kusuntha kwa chinthucho kupita ku mphamvuyo. Mwa masamu, njira ya ntchito imafotokozedwa motere:
\[ W = F \cdot d \cdot \cos(\theta) \]
Kumene:
– \( W \) ndi ntchito (Joules, J),
– \( F \) ndi mphamvu yomwe imagwira ntchito m'thupi (Newton, N),
– \( d \) ndi mtunda umene chinthucho chimasuntha (mamita, m),
– \( \theta \) ndi ngodya pakati pa mbali ya mphamvu ndi mbali ya kusuntha.
Zitsanzo za Ntchito Zamalonda
Chitsanzo chosavuta cha kugwiritsa ntchito lingaliro la ntchito ndi pamene tikukankhira bokosi pansi. Ngati tigwiritsa ntchito mphamvu ya 10 N kuti tisunthire bokosilo mamita awiri kupita ku mphamvu, ndiye kuti ntchito yomwe yachitika ndi iyi:
\[ W = 10 \, \text{N} \cdot 2 \, \text{m} \cdot \cos(0^\circ) = 20 \, \text{J} \]
Mphamvu
Mphamvu ndi mphamvu yogwira ntchito. Mphamvu imabwera m'njira zosiyanasiyana, kuphatikizapo mphamvu ya kinetic, mphamvu ya possible, mphamvu ya kutentha, ndi zina. Mitundu iwiri ya mphamvu yomwe nthawi zambiri imakambidwa pankhani ya makina ndi mphamvu ya kinetic ndi mphamvu ya possible.
Mphamvu ya Kinetic (Ek)
Mphamvu ya kinetic ndi mphamvu yomwe chinthu chimakhala nayo chifukwa cha kuyenda kwake. Fomula ya mphamvu ya kinetic ndi iyi:
\[ E_k = \frac{1}{2} mv^2 \]
Kumene:
– \( E_k \) ndi mphamvu ya kinetic (Joules, J),
– \( m \) ndi kulemera kwa chinthucho (kilogalamu, kg),
– \( v \) ndi liwiro la chinthucho (mamita pa sekondi, m/s).
Mphamvu Yotheka (Ep)
Mphamvu yothekera ndi mphamvu yomwe chinthu chili nayo chifukwa cha malo ake m'munda wa mphamvu. Mtundu wodziwika kwambiri wa mphamvu yothekera ndi mphamvu yokoka, yomwe imapangidwa motere:
\[ E_p = mgh \]
Kumene:
– \( E_p \) ndi mphamvu yokoka (Joules, J),
– \( m \) ndi kulemera kwa chinthucho (kilogalamu, kg),
– \( g \) ndi kufulumira komwe kumachitika chifukwa cha mphamvu yokoka (9,8 m/s² pamwamba pa Dziko Lapansi),
– \( h \) ndi kutalika kwa chinthucho kuchokera pamalo ofotokozera (mamita, m).
Lamulo Losunga Mphamvu
Lamulo losunga mphamvu limati mphamvu sizingapangidwe kapena kuwonongedwa; zimatha kusinthidwa kuchokera ku mawonekedwe ena kupita ku ena. Mu dongosolo lotsekedwa, mphamvu yonse imakhalabe yofanana. Mwachitsanzo, mu kayendedwe ka pendulum, mphamvu yomwe ingakhalepo pamalo apamwamba kwambiri imasinthidwa kukhala mphamvu ya kinetic pamalo otsika kwambiri, ndipo mosemphanitsa.
patsogolo
Momentum ndi muyeso wa kuchuluka kwa kayendedwe ka chinthu ndipo ndi zotsatira za kulemera ndi liwiro la chinthucho. Mwa masamu, momentum (p) imafotokozedwa motere:
\[p = mv \]
Kumene:
– \( p \) ndi mphamvu (kilogalamu mita pa sekondi, kg m/s),
– \( m \) ndi kulemera kwa chinthucho (kilogalamu, kg),
– \( v \) ndi liwiro la chinthucho (mamita pa sekondi, m/s).
Lamulo Losunga Mphamvu
Lamulo losunga mphamvu limafotokoza kuti mu dongosolo lotsekedwa, kuchuluka kwa mphamvu yonse isanayambe komanso itatha kuyanjana ndi komweko. Izi ndi zoona makamaka pakugundana ndi kuphulika. Mwachitsanzo, ngati magalimoto awiri agundana kenako n’kupuma, kuchuluka kwa mphamvu yawo isanayambe kugundana kumakhala kofanana ndi kuchuluka kwa mphamvu yawo itatha kugundana (komwe pankhaniyi ndi zero, popeza magalimoto onse awiri apuma).
Kugwiritsa Ntchito Pamoyo Watsiku ndi Tsiku
Kugwiritsa Ntchito Lingaliro la Ntchito ndi Mphamvu
Mu moyo watsiku ndi tsiku, timatha kuona momwe mfundo za ntchito ndi mphamvu zimagwiritsidwira ntchito pazochitika zosiyanasiyana. Mwachitsanzo, tikanyamula chinthu, timachita ntchito motsutsana ndi mphamvu yokoka ndipo timapatsa chinthucho mphamvu yokoka. Tikakwera njinga, mphamvu ya mankhwala kuchokera ku chakudya chomwe timadya imasandulika mphamvu ya kinetic, yomwe imapangitsa njinga kuyenda.
Kugwiritsa Ntchito Lingaliro la Momentum
Momentum ilinso ndi ntchito zambiri zothandiza. Chitsanzo chimodzi ndi pankhani ya chitetezo cha pamsewu. Malamba a mipando ndi ma airbag amapangidwira kuti awonjezere nthawi yogundana panthawi ya ngozi, motero amachepetsa mphamvu zomwe okwera amakumana nazo. Izi zimachokera pa mfundo yakuti kusintha kwa mphamvu zomwe zimachitika pakapita nthawi yayitali kumachepetsa mphamvu zomwe zimamveka.
Ntchito ndi Mphamvu mu Ukadaulo
Ukadaulo monga makina ndi zida zamagetsi umagwiritsanso ntchito mfundo za ntchito ndi mphamvu. Mwachitsanzo, injini yoyaka mkati mwa galimoto imasintha mphamvu ya mankhwala ya mafuta kukhala mphamvu ya kinetic yomwe imayendetsa galimotoyo. Ma solar panels amasintha mphamvu ya dzuwa kukhala mphamvu yamagetsi yomwe ingagwiritsidwe ntchito pazinthu zosiyanasiyana.
Kupita Patsogolo mu Masewera
Mu masewera, mphamvu nthawi zambiri zimakhala chinthu chofunikira kwambiri. Mwachitsanzo, mu mpira, osewera amagwiritsa ntchito mphamvu zawo kulamulira ndikumenya mpira. Mu nkhonya, osewera a nkhonya amagwiritsa ntchito mphamvu zawo kuti akhudze kwambiri adani awo.
Mapeto
Malingaliro a ntchito, mphamvu, ndi mphamvu ndiye maziko a zochitika zambiri zakuthupi zomwe timaziona tsiku lililonse. Kumvetsetsa njira ndi kugwiritsa ntchito mfundozi sikuti ndikofunikira kokha pakuphunzira sayansi ya sayansi komanso kumakhudza moyo watsiku ndi tsiku. Mwa kudziwa bwino mfundozi, titha kumvetsetsa bwino dziko lotizungulira ndikugwiritsa ntchito chidziwitsochi kuthetsa mavuto m'magawo osiyanasiyana.
