This is a simulation of a simple spring. One of its end points is attached to a moving platform.
simulation, springs
Another classic. Shows how Etoys can demonstrate concepts with an immediate impact. Encourages exploration.
Nice simulation. Just changing the length of the spring's picture will give the streched or compressed spring's picture so that animation is easy. See the related project: http://www.squeakland.org/showcase/project.jsp?id=7691 Last example, oscillations.
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