Study rotational dynamics with the help of this simulation. Angular Acceleration of a Contracting System model shows a mass and pulley system to illustrate what happens when a rotating system contracts.
When the centripetal force has contracted a rotating system to half its initial radius then: (1) The tangential velocity has doubled, (2) The angular velocity is 4 times faster, (3) The rotational kinetic energy is 4 times higher. (4) The required centripetal force is 8 times stronger.

Requirements:
* Java

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