TY - JOUR T1 - Not Everything is Linear or Quadratic - Two Physics Problems of Mechanics A1 - Žák, Vojtěch JA - Obzory matematiky, fyziky a informatiky Y1 - 2009 VL - 38 IS - 2 SP - 35 EP - 41 SN - 1335-4981 N2 - 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. ER -