zhuk dff83290d6 Step is an interactive physics simulator. It works like this: you
place some bodies on the scene, add some forces such as gravity or
springs, then click "Simulate" and Step shows you how your scene
will evolve according to the laws of physics. You can change every
property of bodies/forces in your experiment (even during simulation)
and see how this will change the outcome of the experiment. With
Step you can not only learn but feel how physics works.
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