In the simulation panel press the Launch Simulation button and explore the controls of the sim. If you're speaker is on, the simulation has sound effects. Notice you can: Change the masses of the spheres by using the sliders near or the arrow buttons for Mass 1 (m1, blue sphere) and Mass 2 (m2, red sphere). Change the separation distance by clicking and dragging the spheres. Measure the separation distance or the radii of the spher