Isitayela sokulondoloza hhayi igama lamandla, njengamandla adonsela phansi, amandla okungqubuzana njll. Amandla okulondoloza achaza uhlobo lwamandla. Uma umsebenzi ophelele owenziwe amandla entweni, ngesikhathi into isuka endaweni yayo yokuqala kuze kube yilapho into ibuyela endaweni yayo yokuqala, ulingana no-zero, khona-ke amandla angamandla okulondoloza. Kuthiwa amandla alondoloza uma umsebenzi owenziwe amandla entweni ungaxhomekile endleleni into eyithathayo kodwa kuphela ekushintsheni kwezikhundla zayo zokuqala nezokugcina.
Incazelo yesitayela esilondolozayo kulula ukuyiqonda uma usuvele uyiqonda ukuqonda umsebenzi ku-physicsFunda imibuzo emibili elandelayo eyizibonelo ukuze uqonde umqondo wamandla alondolozayo.
Isibonelo 1
Cabanga ngento ehamba iqonde phezulu bese into ihambela phansi iqonde endaweni yayo yokuqala.
Uma into inyukela phezulu, isiqondiso sokufuduka kwento siphezulu, kanti isiqondiso samandla adonsela phansi noma isisindo (w) siphansi. Isiqondiso sokufuduka kwento siphambene nesiqondiso samandla adonsela phansi, ngakho-ke amandla adonsela phansi enza umsebenzi ongemuhle.
W1 = F s = wh (cos 180) = wh (-1) = – wh = – mgh
Uma into ihambela phansi ibheke endaweni yayo yokuqala, indlela yokufuduka kwento ibheke phansi kanti indlela yamandla adonsela phansi nayo ibheke phansi. Indlela yokufuduka kwento iyafana nendlela yamandla adonsela phansi, ngakho-ke amandla adonsela phansi enza umsebenzi omuhle.
W2 = F s = wh (cos 0) = wh (1) = wh
Umsebenzi ophelele owenziwe ngamandla adonsela phansi entweni ngesikhathi into ikhuphuka bese yehla ulingana no-zero.
WInani = UW1 + UW2 = – wh + wh = 0
Isibonelo, isisindo sento (m) = 1 kg, ukusheshisa kwamandla adonsela phansi (g) = 10 m/s2 kanye nokuphakama (h) = 1 imitha bese kuba yi-W1 = -10 amaJoules kanye no-W2 = AmaJoules ayi-10. Umsebenzi wonke = – AmaJoules ayi-10 + AmaJoules ayi-10 = 0
Isibonelo 2
Cabanga ngento ehamba isuka esigodini iye esiqongweni bese ibuyela emuva esigodini.
Uma nje into ihamba endizeni ethambekele, ingxenye evundlile yamandla adonsela phansi (w sin theta) kuphela esebenza entweni. Uma into isuka esigodini iye phezulu endizeni ethambekele, indlela yokufuduka iphambene nendlela yengxenye evundlile yamandla adonsela phansi (w sin theta) ngakho-ke amandla adonsela phansi enza umsebenzi ongemuhle.
Umsebenzi owenziwa ngamandla adonsela phansi entweni njengoba isuka esigodini iya esiqongweni.
W1 = – F s = – (w sin theta)(s) = – ws sin theta
Ngenxa yokuthi i-sin theta = h / s noma i-h = s i-sin theta khona-ke ifomula engenhla ishintshwa ibe
W1 = – wh = – mgh
Uma into isuka esiqongweni iye esigodini, ukufuduka kufana nengxenye evundlile yamandla adonsela phansi, ngakho-ke amandla adonsela phansi enza umsebenzi omuhle.
W2 = wh = mgh
Umzamo ophelele
Ingqikithi = – mgh + mgh = 0
Isibonelo, isisindo sento (m) = 1 kg, ukusheshisa kwamandla adonsela phansi (g) = 10 m/s2 kanye nokuphakama (h) = 1 imitha bese kuba yi-W1 = -10 amaJoules kanye no-W2 = AmaJoules ayi-10. Umsebenzi wonke = – AmaJoules ayi-10 + AmaJoules ayi-10 = 0
Ngokusekelwe kufomula esetshenziswe esibonelweni sesi-2, kungaphethwa ngokuthi umsebenzi owenziwa amandla adonsela phansi entweni lapho into ihamba endizeni ethambekele ibanga elingu-s lifana nomsebenzi owenziwa amandla adonsela phansi entweni uma into ihamba ngokuqondene nebanga elingu-h.
Ngakho-ke umsebenzi owenziwa ngamandla adonsela phansi awuxhomekile endleleni ehanjiwe kodwa kuphela ekushintsheni kokuphakama. Ngamanye amazwi, umsebenzi owenziwe ngu amandla adonsela phansi kuncike kuphela endaweni yokuqala kanye nendawo yokugcina.
Lezi zibonelo ezimbili zibonisa ukuthi amandla adonsela phansi angamandla alondolozayo. Amandla angamandla alondolozayo uma ehlangabezana nezimo ezimbili. Okokuqala, umsebenzi ophelele owenziwe ngamandla entweni ngesikhathi into isuka endaweni yayo yokuqala ize ibuyele endaweni yayo yokuqala ulingana no-zero (qhathanisa isibonelo 1). Okwesibili, umsebenzi ophelele owenziwe ngamandla entweni awuxhomekile endleleni ethathwe yinto kodwa uncike ekushintsheni kwesimo (qhathanisa isibonelo 2).
Amanye amandla afakiwe emandleni alondolozayo amandla adonsela phansi, amandla kagesi, amandla kazibuthe.
Isibonelo 3
Amandla kaCoulomb kanye namandla adonsela phansi angamandla alondolozayo.
Ngoba
Amandla e-Coulomb kanye namandla adonsela phansi alingana ngokuphambene nesikwele sebanga
Ingxoxo
Amandla kagesi kanye namandla adonsela phansi kungamandla alondolozayo, hhayi ngoba ubukhulu bawo bulingana ngokuphambene nesikwele sebanga. Womabili angamandla alondolozayo ngoba umsebenzi owenziwayo wokuthwala umthwalo ngaphansi kwethonya lala mandla amabili awuxhomekile endleleni noma endleleni ehanjiwe kodwa kuphela ezikhundleni zokuqala nezokugcina zomthwalo.
Amandla angamandla alondolozayo uma umsebenzi awenzayo entweni…
(1) kuncike kuphela esimweni sokuqala kanye nesimo sokugcina
(2) kufana noshintsho emandleni angase abe khona ento
(3) akuxhomekile esimweni somzila wokunyakaza
(4) akuxhomekile ezinguqukweni zamandla angaba khona
Ingxoxo
Amandla angamandla alondolozayo uma umsebenzi awenzayo entweni
(1) kuncike kuphela esimweni sokuqala kanye nesimo sokugcina
(3) akuxhomekile esimweni somzila wokunyakaza
