Are your kids interested in magic? Probably they’re tired of the classical trick with the coin. So, let’s teach them how to make a propeller whirl and change its rotation by simply saying a magic word.
This could be a great chance to show how circular vibrations work and organize a magic show.
a wooden stick 3x2cm and 20cm long
two flat balsa laths 2mm thick and 3cm long
2 small nails