Slinky approximation made easy. Falling Slinky model approximates a slinky using twenty masses connected with light springs. The slinky is suspended from one end and released. Two actions will occur simultaneously when it is released hanging at rest from its equilibrium position - it will fall and it will collapse. What happens to the bottom when it begins its fall?
1. The bottom end will move up initially.
2. The bottom end will move down initially.
3. The bottom end will remain at the same point for a short time before it begins to move.
The Falling Slinky model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double click the ejs_mech_newton_FallingSlinky.jar file to run the program if Java is installed.

Modeling
Center of Mass
Modify the Falling Slinky model to display a small marker at the slinky center of mass.?How does the center of mass marker move when the uncoiled slinky is first released with its top held?
Dynamical Variables
Add a graph with curves showing the positions of the top, the bottom, and the center of mass as functions of time. Use this graph to study the time dependence of the slinky length.
Waves (Advanced)
Add a sinusoidal variable frequency driving force to the top of the slinky. Determine the standing wave resonances of this system.

Requirements:
* Java

The license of this software is Free, you can free download and free use this graphing software.