Ko te waku nekeneke te kaha waku e pā ana ki ngā mata o ngā mea e pā ana tetahi ki tetahi i te wā e neke ana ngā mea.
Ki te hiahia koe ki te whakatau i te kaha waku pūmau, whakamahia te whārite 1.5 a. Ki te hiahia koe ki te whakatau i te tauwehenga waku nekeneke, whakamahia te whārite 1.5 b.
E whakaatu ana te Pikitia 2 i tētahi mea e tōia ana i ia wā, kia neke ai te mea i te tere pumau. Ina neke i te tere pumau, ko te rahi o fk he rite ki te rahi o te kaha kukume (F).
E ai ki te Ture Tuatahi a Newton, ka neke te mea i te tere pumau mēnā he ōrite te kaha katoa (te kaha hua) ki te kore.
Tauira raruraru.
1. Ka tōia he poraka 1 kg te taumaha e whakatakotoria ana ki runga i tētahi mata papatahi mā te whakamahi i tētahi dynamometer kia neke te poraka i te tere pumau. Mena ko te rahi o te kaha tō e tohuhia ana e te dynamometer he 1 Newton, ā, ko te whakaterenga nā te kaha ā-papa he 10 m/s2, whakatau: (a) te rahi o te kaha waku nekeneke (b) te tauwehenga o te waku nekeneke
Kōrero
E mōhiotia ana :
Taumaha o te poraka (m) = 1 kg
Te whakaterenga nā te kaha ā-papa (g) = 10 m/s2
Te taumaha o te poraka (w) = mg = (1 kg)(10 m/s)2) = 10 kg m/s2 = 10 Niutona
Ko te rahi o te kaha kukume (F) = 1 Newton
Whakautu :
(a) Nui fk
Ina neke auau te poraka, ina neke rānei i te tere pumau, ko te rahi o f kok = te rahi o te kaha kume (whakatairitehia te whārite 1.6)
Nō reira, ko te rahi o te kaha waku nekeneke (fk) = te rahi o te kaha kume (F) = 1 Newton
(b) Te tauwehenga o te waku nekeneke
