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'Perpetual' motion machine

Note (?)
Difficulté (?)
Durée (?)2h 0 min.
Coût (?)~10 CHF
Languefrançais english
License (?)

Since ancient times, scientists have wondered whether it would be possible to create a machine that, once started and without adding extra energy, would never stop. Even Leonardo da Vinci tried to imagine such a mechanism, but found it impossible.


Even if we know it's impossible, some people are still convinced they have discovered the secret of this machine. Some even claim that there is a perpetual motion models that can produces more energy than what they use.


This activity consists of building a 'perpetual motion machine' based on the concept proposed in 1150 by the Indian mathematician Bhaskara II and help children to :

  • Understand that perpetual motion is impossible which prevents them from believing in miraculous solutions that would disqualify all our efforts to save energy.
  • Avoid being influenced by theories that are not scientifically validated, especially on the Internet (fake news, free energy).
  • Encourage creativity and curiosity by trying to understand why a given model cannot work in perpetuity; this involves understanding basic mechanics and thermodynamics.
  • Understand that while perpetual motion is impossible, limiting losses helps to concieve energy efficient machines.





Using a marker, draw the location of the popsicle sticks on the iridescent side of the CD using ...
Use contact glue to fix the 8 wooden sticks to the CD. Press well.
Using 'special plastics' glue, fix the ball bearing on the other side of the CD exactly in the c ...
Using a drill with an M8 bit, drill a 1 cm hole from the top of the wood bar.
Drill two holes with an M3 bit in the wooden board as shwon in the picture.
Pass two wood screws through the bottom of the base and screw the bar in place vertically.
Tint water with herbal teas or food colouring.   Partially fill the test tubes with the same a ...
Attach each tube to a stick with two colson cable ties. Once tightened, cut off the excess part. ...
Screw the Y shaped nut onto the large screw; the larger part on the screw head side.
Pass the screw through the centre of the cd on the sticks side and secure it at the rear by tigh ...