A Sand Pendulum That Creates A Beautiful Pattern Only By Its Movement.

A sand pendulum that creates a beautiful pattern only by its movement.

But  why does the ellipse change shape?

The pattern gets smaller because energy is not conserved (and in fact decreases) in the system. The mass in the pendulum gets smaller and the center of mass lowers as a function of time. Easy as that, an amazing pattern arises through the laws of physics.

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A lie gets halfway around the world before the truth has a chance to get its pants on.

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