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)
2. Te Kaha Noa
Ko te kaha noa he kaha e pā ana ki ngā mea e rua e pā ana tetahi ki tetahi, ā, ko te ahunga o te kaha noa e poutū ana ki te mata o te wāhi pā.
Mātakihia tētahi mea e tū ana i runga i te mata o te tēpu. Ka pā anō hoki te taumaha, te kaha ā-pūmanawa rānei ki te mea. Kāore ngā mea e taka noa ana pērā i te hua e taka ana mai i te rākau nā te mea he kaha noa kei reira e taurite ana i te kaha o te ā-pūmanawa. He rite te rahi o te kaha ā-pūmanawa me ngā kaha noa engari he rerekē ngā ahunga, nō reira ko te kaha hua e pā ana ki te mea he kore.
