An android app with different modes to roughly represent gravity with a black body and some red particles.
Click on the "title" in order to iterate through the different modes.
This mode allows you to create a single particle with an initial velocity. To do so, hold down from a starting point and drag your finger on the screen to create a vector.
By just dragging your finger on the screen you can create a multitude of particles which will also have an initial velocity depending on the speed of the drag.
In this mode you can change the position of the black body.