Physics Mechanical And Chemical Interactions - 1432 Words

From analyzing the students’ choices of models of friction and lubrication, two overarching themes emerged regarding mechanical and chemical interactions. We see in table III that about 81% of the students interviewed used mechanical interactions to explain friction and when asked to explain microscopic friction the majority referred to their â€Å"interlocking-intertwining† or â€Å"rubbing-hitting† models. Most agreed friction is the force required to move atoms over bumps and valleys because of intertwining and interlocking of the atoms or friction is the force caused by the rubbing and sliding of an atom past another. Also when the students with the interlocking model were question about the outcome if the surface was to become automatically smooth they all agreed friction would persist because â€Å"there is still some contour in the them (atoms).† Likewise when asked to explain why oil reduces friction, the majority said the â€Å"oil molecules roll † like a â€Å"ball bearings rolling on a surface†. The theme that the thematic analysis revealed about the chemical interactions was that around 27% of the students think that microscopic friction is the force needed to break the bonds required to break bonds between the atoms of the surfaces that are touching. 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