Aboutan open source physics at Singapore simulation based on codes written by Andrew Duffy, Anne Cox, Wolfgang Christian, Francisco Esquembre and Loo Kang WEE.more resources can be found herehttp://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/08-gravity IntroductionEvery object sets up a gravitational field around itself due to its mass. When two objects enter each other’s gravitational fields, they will be attracted to each other. Hence, a gravitational field is a region of space in which any object that lies in it experiences a gravitational force towards the object that creates the field, due to its mass. This Lab allows the inquiry of gravity concepts of field and potential for a two mass setup.Interesting FactThis app produces real numbers to coincident with the real world data.AcknowledgmentMy sincere gratitude for the tireless contributions of Francisco Esquembre, Fu-Kwun Hwang, Wolfgang Christian, Félix Jesús Garcia Clemente, Anne Cox, Andrew Duffy, Todd Timberlake and many more in the Open Source Physics community. I have designed much of the above based on their ideas and insights.This research is supported by the eduLab project NRF2015-EDU001-EL021 , awarded by the Prime Minister Office, National Research Foundation (NRF), Singapore in collaboration with National Institute of Education (NIE), Singapore and the Ministry of Education (MOE), Singapore.reference:http://edulab.moe.edu.sg/edulab-programmes/existing-projects/nrf2015-edu001-el021Network Learn together?FaceBook Fan Page: https://www.facebook.com/Open-Source-Physics-Easy-Java-Simulation-Tracker-132622246810575/Twitter: https://twitter.com/lookangYouTube: https://www.youtube.com/user/lookang/videosBlog: http://weelookang.blogspot.sg/Digital Library: http://iwant2study.org/ospsg/