Cup-and-String Telephone - STEM Kit for grades 1-2

The Cup-and-String Telephone STEM Kit brings classic science to life by showing how sound travels through vibrations. Students build a simple telephone using two cups and a tightly stretched string, then test how voices are transmitted through the string by vibration—just like early sound communication systems.

This hands-on activity introduces key STEM concepts such as sound waves, vibration, tension, and energy transfer, helping learners understand the basics of how we hear and communicate. It’s a fun and engaging way to turn everyday materials into a powerful science experiment!