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