He momo tōpana ka pā ki tētahi mea. E whā ngā hua o te tōpana pēhi:
A type of force which is applied to something with four possible outcomes:
He tōpana pēhi te pereki o te pahikara, ka kōpēngia te wīra hei whakapōturi i tōna huri.
Kimihia ētahi tauira o te whakamahinga o te tōpana pēhi.
Whakamāramahia mai te hua o te tōpana pēhi ka pā ki te poihau.