Graviton

If you hover over or click on the slider on the right side of the frame, the slider will come out. In the slider is a generator, which you can click on and drag around the frame.

You can adjust the power of the generator by clicking on the power bars, and activate the generator by pressing the on button. Similarly, you can deactivate the generator by pressing the off button. You can get rid of the generator by clicking and dragging it to the trash barrel in the lower-left corner of the frame.

Clicking the plus sign or the minus sign in the lower-right corner of the frame will increase or decrease the number of balls. Clicking the pause button will pause the simulation, allowing for changes.