Amafomula Omsebenzi, Amandla, kanye Nomfutho: Imiqondo Eyisisekelo kanye Nezicelo
Umsebenzi, amandla, kanye nomfutho yimibono emithathu eyisisekelo ku-physics edlala indima ebalulekile ekuqondeni izenzakalo zemvelo ezahlukahlukene. Kulesi sihloko, sizoxoxa ngamafomula ahlobene nale mibono emithathu kanye nokusetshenziswa kwayo empilweni yansuku zonke.
Ibhizinisi (W)
Ku-physics, umsebenzi uchazwa njengomkhiqizo wamandla asebenza entweni kanye nokufuduka kwento iye ohlangothini lwamandla. Ngokwezibalo, ifomula yomsebenzi ivezwa kanje:
\[ W = F \cdot d \cdot \cos(\theta) \]
Kuphi:
– \( W \) umsebenzi (Joules, J),
– \( F \) amandla asebenza emzimbeni (Newton, N),
– \( d \) ibanga elihanjiswa yinto (amamitha, m),
– \( \theta \) yi-engeli ephakathi kwesiqondiso samandla kanye nesiqondiso sokufuduka.
Izibonelo Zezicelo Zebhizinisi
Isibonelo esilula sokusetshenziswa komqondo womsebenzi yilapho sicindezela ibhokisi phansi. Uma sisebenzisa amandla angu-10 N ukuhambisa ibhokisi ngamamitha amabili ngasendleleni yamandla, khona-ke umsebenzi owenziwe yile:
\[ W = 10 \, \text{N} \cdot 2 \, \text{m} \cdot \cos(0^\circ) = 20 \, \text{J} \]
Amandla
Amandla yikhono lokwenza umsebenzi. Amandla eza ngezindlela eziningi, okuhlanganisa amandla e-kinetic, amandla angase abe khona, amandla okushisa, nezinye. Izinhlobo ezimbili zamandla okuxoxwa ngazo kakhulu kumongo we-mechanics yi-kinetic energy kanye namandla angase abe khona.
Amandla e-Kinetic (Ek)
Amandla e-kinetic amandla into enawo ngenxa yokunyakaza kwayo. Ifomula yamandla e-kinetic yile:
\[ E_k = \frac{1}{2} mv^2 \]
Kuphi:
– \( E_k \) amandla e-kinetic (Joules, J),
– \( m \) isisindo sento (ikhilogremu, kg),
– \( v \) ijubane lento (amamitha ngomzuzwana, m/s).
Amandla Angaba Khona (Isiqephu)
Amandla angase abe khona amandla aphethwe yinto ngenxa yesikhundla sayo ensimini yamandla. Uhlobo oluvame kakhulu lwamandla angase abe khona amandla adonsela phansi, akhiwe kanje:
\[ E_p = mgh \]
Kuphi:
– \( E_p \) amandla adonsela phansi (Joules, J),
– \( m \) isisindo sento (ikhilogremu, kg),
– \( g \) ukusheshisa okubangelwa amandla adonsela phansi (9,8 m/s² ebusweni boMhlaba),
– \( h \) ukuphakama kwento kusukela endaweni yokubhekisela (amamitha, m).
Umthetho Wokulondolozwa Kwamandla
Umthetho wokulondolozwa kwamandla uthi amandla awakwazi ukudalwa noma ukubhujiswa; angaguqulwa kuphela kusuka kwesinye isimo aye kwesinye. Ohlelweni oluvaliwe, inani eliphelele lamandla lihlala lingaguquki. Isibonelo, ekunyakazeni kwe-pendulum, amandla angaba khona endaweni ephezulu kakhulu aguqulwa abe amandla e-kinetic endaweni ephansi kakhulu, futhi okuphambene nalokho.
Momentum
I-Momentum iyisilinganiso senani lokunyakaza kwento futhi ingumkhiqizo wobukhulu kanye nesivinini sento. Ngokwezibalo, i-momentum (p) ivezwa kanje:
\[p = mv \]
Kuphi:
– \( p \) umfutho (amamitha amakhilogramu ngomzuzwana, kg m/s),
– \( m \) isisindo sento (ikhilogremu, kg),
– \( v \) ijubane lento (amamitha ngomzuzwana, m/s).
Umthetho Wokulondolozwa Kwejubane
Umthetho wokulondolozwa komfutho uthi ohlelweni oluvaliwe, inani eliphelele lomfutho ngaphambi nangemva kokuxhumana liyafana. Lokhu kuyiqiniso ikakhulukazi ezingozini nasekuqhumeni. Isibonelo, uma izimoto ezimbili zishayisana bese ziphumula, inani lomfutho wazo ngaphambi kokushayisana lilingana nenani lomfutho wazo ngemva kokushayisana (okuyinto kuleli cala engu-zero, njengoba zombili izimoto seziphumulile).
Izicelo Empilweni Yansuku Zonke
Ukusetshenziswa Komqondo Womsebenzi Namandla
Empilweni yansuku zonke, singabona ukusetshenziswa kwemibono yomsebenzi namandla emisebenzini eyahlukahlukene. Isibonelo, uma siphakamisa into, senza umsebenzi wokulwa namandla adonsela phansi futhi sinikeze amandla adonsela phansi into leyo. Uma sigibela ibhayisikili, amandla amakhemikhali avela ekudleni esikudlayo aguqulwa abe amandla e-kinetic, okwenza ibhayisikili lihambe.
Ukusetshenziswa koMqondo we-Momentum
I-Momentum nayo inezindlela eziningi ezisebenzayo. Isibonelo esisodwa sisekuphepheni komgwaqo. Amabhande esihlalo kanye nama-airbag aklanyelwe ukwandisa isikhathi sokushaya ngesikhathi sengozi, ngaleyo ndlela kuncishiswe amandla abhekene nabagibeli. Lokhu kusekelwe esimisweni sokuthi izinguquko zomfutho ezenzeka esikhathini eside zinciphisa amandla azwakalayo.
Umsebenzi kanye Namandla Kwezobuchwepheshe
Ubuchwepheshe obufana nemishini namadivayisi kagesi busebenzisa nemiqondo yomsebenzi namandla. Isibonelo, injini yokushisa yangaphakathi emotweni iguqula amandla amakhemikhali kaphethiloli abe amandla e-kinetic aqhuba imoto. Amaphaneli elanga aguqula amandla elanga abe amandla kagesi angasetshenziswa ngezinjongo ezahlukene.
Umfutho Kwezemidlalo
Kwezemidlalo, umfutho uvame ukuba yinto ebalulekile. Isibonelo, ebholeni, abadlali basebenzisa umfutho wabo ukulawula nokukhahlela ibhola. Ebhokiseni, abashayi bebhokisi basebenzisa umfutho wezibhakela zabo ukuze bandise umthelela kubaphikisi babo.
Isiphetho
Imibono yomsebenzi, amandla, kanye nomfutho kuyisisekelo sezinto eziningi ezibonakalayo esizibona nsuku zonke. Ukuqonda amafomula kanye nokusetshenziswa kwale mibono akubalulekile nje kuphela ekufundeni i-physics kodwa futhi kunokubaluleka okusebenzayo empilweni yansuku zonke. Ngokuqonda le mibono, singayiqonda kangcono umhlaba osizungezile futhi sisebenzise lolu lwazi ukuxazulula izinkinga emikhakheni eyahlukahlukene.
