2 Ngā tauira o ngā pātai taurite tinana pakari
1. F1 = 10 N, F2 = 15 N me F4 = 10 N, e pā ana ki te poraka ABCD e whakaaturia ana i te pikitia. Ko te roa o te poraka ABCD he 20 mita. Whakatauhia a F3 kia noho taurite tonu te poraka. Kaua e aro ki te taumaha o te poraka.
Kōrero:
2. Kua whakatakotoria ngā pouaka A (10 kg) me B (20 kg) ki runga i tētahi papa rakau. Ko te roa o te papa = 10 mita. Mena ka whakatakotoria te pouaka B kia 2 mita mai i te pūtahi, ki tēhea tawhiti mai i te pūtahi me whakatakoto te pouaka A kia kore ai te papa e hurihuri? (g = 10 m/ s² )
Kōrero:
Hipanga 1: tuhia he hoahoa o ngā kaha e pā ana ki te mea
Hipanga 2: whakaoti rapanga
Tirohia te hoahoa i runga ake nei. Ko ngā kaha e pā ana ki te papa ko te taumaha o te pouaka B (w B ), te taumaha o te pouaka A (w A ), te taumaha o te papa (w papa) me te kaha noa (N). Ko te pūwāhi hurihuri ko te tuaka hurihuri. Ka ōrite te taumaha o te papa (w papa) me te kaha noa (N) ki te pūwāhi/tuaka hurihuri kia kore ai te ringa kaha. Kāore te papa w me te N i whakaurua ki te tatau.
Taipana 1 = taipana i hangaia e te kaha ā-papa o te pouaka B (taipana pai)
Taipana 2 = taipana i puta mai i te kaha ā-papa o te pouaka A (taipana kino)
Kei roto te papa i te taurite pumau mēnā he 0 te taipana katoa.
Kia taurite ai te papa, me whakanoho te mea A kia 4 mita te tawhiti mai i te pūwāhi tautoko.
