You can also change the total energy of the system. The total energy is the sum of potential and kinetic energy. The potential energy can be positive or negative, but the kinetic energy must always be positive. Thus, the Applet will not allow you to set the total energy below the current value of the potential energy.
You can change the number of frames per second of the simulation. Many implementations of Java cannot gracefully handle much more than, say, 20 frames per second. Changing the rate of frames per second does not change the perceived speed of the simulation; it simply changes the number of intermediate values calculated. The simulation will still proceed in real time. If you want to see the simulation in slow or in fast motion, you can change the "time factor": a number greater than 1 means fast motion, and a number less than 1 means slow motion. You can even enter a negative time factor to see the simulation move backwards in time.
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