Bhinyo PanijpanThanida SujaritthamKwan ArayathanitkulJintawat TanamatayaratSuchai NopparatjamjomrasMahidol University2018-09-132018-09-132009-11-30Physics Education. Vol.44, No.6 (2009), 599-60213616552003191202-s2.0-70450284503https://repository.li.mahidol.ac.th/handle/20.500.14594/28337A set-up comprising a magnetic disc, a solenoid and a mechanical balance was used to teach first-year physics students Newton's third law with the help of a free body diagram. The image of a floating magnet immobilized by the solenoid's repulsive force should help dispel a common misconception of students as regards the first law: that stationary objects are not being acted on by any force at all. Dropping the magnet onto the electrified solenoid, which can change polarity, can lead to more sophisticated elaboration of the secondlaw. © 2009 IOP Publishing Ltd.Mahidol UniversityPhysics and AstronomySocial SciencesArticleSCOPUS10.1088/0031-9120/44/6/004