Interactive Science exhibits, ideated and fabricated to inclucate and invigorate the young minds about Science !!
Shut the hole provided in the funnel with your finger. Now pour fine sand or any sieved powder. Push the tray for a gentle swing, simultaneously oscillate the funnel diagonally and remove your finger.
What did you observe?
Some patterns are drawn on the tray by the powder poured from the hole of the funnel.
The science behind it :
Here, the tray’s movement and the funnel’s movement are two simple harmonic motions. The resultant of these two creates a uniform pattern. This phenomenon was illustrated by the Scientist Jules Antoine Lissajou. Hence the figures obtained on the tray are called Lissajou’s figures.