Easy and simple, this string phone project is kid-friendly and can teach your children about sound waves.
“Speaking into the cup creates sound waves which are converted into vibrations at the bottom of the cup. The vibrations travel along the string and are converted back into sound waves at the other end so your friend can hear what you said. Sound travels through the air but it travels even better through solids such as your cup and string, allowing you to hear sounds that might be too far away when traveling through the air.” –Science Kids
What you need:
- 2 cups (paper or disposable plastic)
- Sharp pencil
- Cut a long piece of string.
- Poke a small hole at the bottom of each cup.
- Put the string through and tie a knot at each end so that the string doesn’t fall through.
- Give one cup to a partner and hold the cups at distance, making sure that the string is taut and not touching anything else.
- Have one person talk and the other person listen. You should be able to hear each other!
Find out more about the science behind this project here!