Free App
https://itunes.apple.com/us/app/earth-moon-escape-velocity-lab/id1190227799?ls=1&mt=8
Pro App
https://itunes.apple.com/us/app/earth-moon-escape-velocity-lab-pro/id1245993225?ls=1&mt=8

About
an open source physics at Singapore simulation based on codes written by Andrew Duffy and Loo Kang WEE.
more resources can be found on support URL

Introduction
Every 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 towards 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 Fact
This app produce real numbers to coincident with the real world data.