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My College fair-----Perpetual motion machine
2017-06-09

[SCIE web news, June 8th, 2017] To make a simple perpetual motion machine, we used wooden sticks, iron wires, a knife, bottle caps, pins, cardboards and scotch tapes.( We bought 8 popsicles and 6 bottles of water for these materials.) Firstly, cut the cardboard into a round circle and draw two lines to determine the position to pound nails. The distance between those nails are the same and the lines connecting the nails are perpendicular. Cut half of wooden sticks into the shape of notes, use other three sticks to build out a support. Furthermore, bend pins and fix them onto the cardboard round. It should be covered by scotch tapes in order to reduce friction as much as possible.

 

     

Snatch another turn of iron wires so that the cardboard won’t incline. Use art knife to dig holes on bottle caps, pass iron wires through the holes and twine them on wooden sticks to fix the bottle caps. Ideally, if it has an initial force, bottle caps above will fall because of gravity and other caps will be lifted at the same time. This process repeated for many times to work as a perpetual motion machine. However, we found that caps were too light to make the machine rotate, so we twined wires on them. To prevent the falling process of a cap be affected by other caps’ weights, obstacles made by iron wires were hang on the right sides of caps.

 

 

     

They couldn’t sag any more when they were lifted and fell more quickly. Although our product was not very successful this time, for example, someone got hurt when she bent the pins and “perpetual” motion machine could only work for 5 seconds due to fragile materials, we learned a lot from this science fair. This process was meaningful and totally manual. Theory is very different from practice so we always need to operate with our own hands.

Report &Picture / Sunny

 

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