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We develop an Easy Java Simulation (EJS) model for students to experience thephysics of idealized one-dimensional collision carts. The physics model isdescribed and simulated by both continuous dynamics and discrete transitionduring collision. In the field of designing computer simulations, we discussbriefly three pedagogical considerations such as 1) consistent simulation worldview with pen paper representation, 2) data table, scientific graphs andsymbolic mathematical representations for ease of data collection and multiplerepresentational visualizations and 3) game for simple concept testing that canfurther support learning. We also suggest using physical world setup to beaugmented complimentary with simulation while highlighting three advantages ofreal collision carts equipment like tacit 3D experience, random errors inmeasurement and conceptual significance of conservation of momentum applied tojust before and after collision. General feedback from the students has beenrelatively positive, and we hope teachers will find the simulation useful intheir own classes. 2015 Resources added:http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/02-dynamics/46-one-dimension-collision-js-modelhttp://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/02-dynamics/195-elastic-collision

One-dimensional collision carts computer model and its design ideas for productive experiential learning