What is that? Oh, just a 15 pound air compressor/battery attached to the ceiling with speaker wire. In class, we were tasked with building a pendulum and competed to see which design would remain in motion for the longest time. Our group selected a weight item with the largest mass we could find and tried to maximize the length of the cord.
Energy Pendulum

Pendulum

 

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Since we were working in the japanese room, Maria Paula suggested that the energy from the pendulum could be utilized to power sewing machines. I recall my grandmother having an old sewing machine that you powered by pushing on a plate near the floor. It seems like we could translate the pendulum motion into rotary power, similar to the method in this video:

I'm not sure how this would all work under the load of the machine though.

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