@ARTICLE {, title = {Not Everything is Linear or Quadratic - Two Physics Problems of Mechanics}, author = {Žák, Vojtěch}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2009}, volume = {38}, number = {2}, pages = {35--41}, issn = {1335-4981}, abstract = {Secondary school students can have an inccorect idea that all quantity dependences in physics are linear or quadratic. In this paper, we present proposals of two physics problems in Mechanics which could challenge these wrong ideas. These problems can be implemented into common lessons of physics at grammar school level.}, }