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We develop an Easy Java Simulation (EJS) model for students to visualizeNewtons 1st and 3rd laws, using frictionless constant motion equation and aspring collision equation during impact. Using Physics by Inquiry instructional(PbI) strategy, the simulation and its problem based inquiry worksheet aim toenhance learning of these two Newtonian concepts. We report results fromExperimental (N=62 students) and Control (N=67) Groups in 11 multiple choicequestions pre and post tests, conducted by three teachers in the school.Results suggest, at 95 percent confidence level, significant improvement forconcept of Newtons 1st Law while not so for Newtons 3rd Law. A Focus GroupDiscussion revealed students confirming the usefulness of the EJS model invisualizing the 1st Law while not so much for the 3rd Law. We speculate thedesign ideas for constant velocity motion in the computer model coupled withthe PbI worksheet did allow for making sense and experiencing of the 1st Law,where traditional pen-paper representations could not. We have improved thefeatures for the action-reaction contact forces visualization associated withthe 3rd Law and we hope other teachers will find the simulation useful fortheir classes and further customize them to benefit all mankind, becomingcitizens for the world.

Addressing learning difficulties in Newtons 1st and 3rd Laws through problem based inquiry using Easy Java Simulation