Gravity Sandbox is a fun toy/game where you can play with Newtonian Gravity. Place heavy objects in patterns and see interesting results.
On the left side, there are 5 buttons for Play/Pause, Place Mode, Pan Mode, Selection Mode, Clear All, and Load Presets.
On the right side, the Mass and Color properties are for
new bodies and Speed and Gravity are for simulation.
spacephscCTRL + ZCTRL + YdeleteCTRL + MCTRL + S