You should see an Energy Graph to the left. If not, make sure you are in the correct simulation. Set the Gravity to \"None\" (g = 0), which simulates what happens without any gravitational forces (and consequently removes gravitational potential energy from the energetics). Adjust the damping slider to \"None\" (this prevents any energy dissipation). Place the weight on the spring and set its mass value to 125 g. Set the spring constant to \"Large.\" Next, stretch the spring and release the mass. The amplitude of the stretch should be large enough to get good resolution on the Energy Graph, but not so much that the spring overshoots at the top. Observe how the kinetic energy and elastic potential energy vary with time. Note: you can slow down or stop time using the controls in the lower right of the simulation window.
When is the elastic potential energy of the spring a maximum?
When the spring isn't stretched or compressed
When the spring is most compressed
Both when the spring is most compressed and when the spring is most stretched
When the spring is most stretched
