E rua ngā tauira o te whakamahi i ngā ture a Newton ki tētahi pūnaha taura me te utaina porotaka
1. Ko te taumaha o te poraka 1 he 2 kg, ko te taumaha o te poraka 2 he 3 kg, ko te whakaterenga nā te kaha ā-papatipu he 10 m/s2. Whakatauhia (a) te rahi me te ahunga o te whakaterenga o te pūnaha (b) te rahi o te kaha kume i runga i te taura!
Kōrero
4 ngā tauira pātai mō te whakamahinga o ngā ture a Newton ki te nekehanga tika o te ararewa, o te ararewa rānei
1. Kei roto i tētahi ararewa tētahi tangata he 50 kg te taumaha. Te whakaterenga nā te kaha ā-papatipu = 10 m/s2Whakatauhia te rahi o te kaha noa e pā ana ki te papa o te ararewa ki te tangata mēnā:
(a) ararewa wahangu
(b) ka neke te ararewa ki raro i te tere pumau
(c) ka neke te ararewa ki runga me te whakaterenga o te 5 m/s2
(d) ka neke te ararewa ki raro me te whakaterenga o te 5 m/s2
(e) ararewa hinga kore utu
E rua ngā tauira o te whakamahi i ngā ture a Newton ki tētahi papa whakarara maeneene (kāore he waku)
1. Ko te taumaha o te poraka he 2 kg, ko te whakaterenga nā te kaha ā-papatipu = 10 m/s2. Whakatauhia (a) te kaha hua e whakateretere ana i te poraka (b) te rahi o te whakateretere o te poraka.
Kōrero
E rua ngā tauira o te whakamahi i ngā ture a Newton ki ngā papa whakarara (he waku kei reira)
1. Ko te taumaha o te poraka he 2 kg, ko te whakaterenga nā te kaha ā-papatipu = 10 m/s2, ko te tauwehenga o te waku pūmau me te waku nekeneke he 0,2 me te 0,1. Kei te tū tonu te poraka, kei te neke rānei? Mena kei te neke te poraka, whakatauhia (a) te kaha hua e whakateretere ana i te poraka (b) te rahi me te ahunga o te whakateretere o te poraka!
Kōrero
Te ture tiaki o te nekehanga raina e kī ana mēnā kāore he kaha o waho e pā ana ki ngā mea e rua e tukinga ana, kāti torohaki he rite tonu te nekehanga o te mea i mua i te tukinga ki te nekehanga o te mea i muri i te tukinga.
Ngā Mōhiohio:
m1 = te papatipu o te mea 1, m2 = te papatipu o te mea 2
Rauemi Tukinga Kore-whakapūmau
I roto i te tukinga ā-wāhanga elastic (tukinga kore-tino-elastic), ka pā te ture tiaki o te nekehanga , engari kāore te ture tiaki o te pūngao nekeneke. I te wā o te tukinga, ka hurihia ētahi o te pūngao nekeneke hei pūngao oro, pūngao wera, me te pūngao ā-roto. Ko te whakamahinga o te kupu elastic e tohu ana i muri i te tukinga, kāore ngā mea e rua e hanumi hei mea kotahi, e piri rānei, engari ka pekepeke. Ko tētahi tauira o te tukinga kore-tino-elastic ko te tukinga kotahi-ahu i waenganui i ngā māpere e rua, i ngā pōro piriata e rua rānei.
Ka kiia te tukinga i waenga i ngā mea he tukinga tino pīwariwari mēnā he ōrite te nekehanga me te pūngao nekeneke o ia mea i mua i te tukinga ki te nekehanga me te pūngao nekeneke o ia mea i muri i te tukinga. Arā, i roto i te tukinga tino pīwariwari, ka pā te ture tiaki nekehanga me te ture tiaki pūngao nekeneke. Ko te whakamahinga o te kupu pīwariwari e tohu ana i muri i te tukinga, kāore ngā mea e rua e hanumi hei mea kotahi, kāore rānei e piri tahi engari e pekepeke ana.
I roto i te tukinga ā-wāhanga elastic (tukinga kore-tino-elastic), ka pā te ture tiaki o te nekehanga , engari kāore te ture tiaki o te pūngao nekeneke. I te wā o te tukinga, ka hurihia ētahi o te pūngao nekeneke hei pūngao oro, pūngao wera, me te pūngao ā-roto. Ko te whakamahinga o te kupu elastic e tohu ana i muri i te tukinga, kāore ngā mea e rua e hanumi hei mea kotahi, e piri rānei, engari ka pekepeke. Ko tētahi tauira o te tukinga kore-tino-elastic ko te tukinga kotahi-ahu i waenganui i ngā māpere e rua, i ngā pōro piriata e rua rānei.
1. Taumaha (w)
Ko te kaha ā-papatipu, e whakarapopototia ana ko te taumaha, ko te kaha ā-papatipu e pā ana ki tētahi mea he papatipu tōna. Ko te tohu mō te kaha ā-papatipu ko te w, e tohu ana mō taimaha.
I ahu mai te tātai mō te tatau i te kaha ā-papatipu i te tātai Te ture tuarua a Newton :
F = ma
Whakamahia hei tatau i te kaha ā-papatipu:
w = mg
Ngā Whakamārama :
F = kaha (wae ao = Newton)
w = te kaha ā-papatipu (te wae ā-ao = Newton)
m = te papatipu o te mea (ngā waeine ā-ao = kg)
he = whakaterenga (te waeine ā-ao = m/s2)
g = te whakaterenga nā te kaha ā-papatipu (ngā waeine ā-ao = m/s2)
1. Te whakamāramatanga o te kāhua
Ko te kaha te mea e pāngia ai ngā mea whakaterengaAra, ko te kaha he mea e neke ana, e aukati ana, e whakarerekē ana rānei i te ahunga o te nekehanga o tētahi mea.
Ko te kāhua rahinga wetere Nō reira, he rahi, he ahunga hoki tō te kaha. Ko te tohu mō te kaha ko F (Taukaha). Ko F te tohu whānui mō te kaha. He maha ngā momo kaha, ā, ehara i te mea he tohu F tō ngā momo kaha katoa. Ko te waeine ā-ao mō te kaha ko kg m/s2 arā, ko Newton.