Everyone is familiar with the motion of a mass attached to a spring. When displaced from equilibrium, the mass executes simple harmonic motion (assuming a linear spring). The presence of frictional forces results in an exponential decrease in the amplitude over time, so that the mass eventually returns to rest.
Simply drag the mass from equilibrium using the mouse, and let go to start the motion. You can adjust the mass, the spring constant k (which quantifies the stiffness of the spring), and the damping. Pressing finish will stop the applet execution.
