Kitu kinapoteza mnato kutokana na freguency ya matumizi. Any mayerial has a limit to resist external forces, if the external forces are huge or they exceed the limit of the material, then the material will undergo what is called deformation. Waambie wajitunze na wasidhani matako hayo ya wachina na hizo papuchi ndio maisha, kuna mengi nje ya hayo.
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