The simulation beeps each time the ball passes one of the vertical red lines.
Just like the bells on Galileo's ramp, the positions of three of the vertical red lines can be adjusted.
The first line and the last line are fixed in place, but the sliders allow you to adjust the positions of the second, third, and fourth lines.
Move the lines around until the beeps occur at regular time intervals (make sure the sound is on, on your computer or mobile device).
This work by Andrew Duffy is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
This simulation can be found in the collection at http://physics.bu.edu/~duffy/classroom.html.
The counter has been running on this page since 8-9-2018. The number of people accessing the page since then is: