Spinning Pendulum Wave Machine Challenge
⚠️ Safety Warning
Ensure the dowel is secure and won't fall. Use lightweight nuts to prevent injury.
All experiments require adult supervision.
Materials You'll Need
Gather these 6 items before starting
💡 Tip: Check off items as you gather them to stay organized!
Step-by-Step Instructions
Follow these 8 steps carefully
For this spinning version, place two chairs about 60cm apart and lay the dowel across the backs.
Cut 15 pieces of string, each slightly different in length — start at 25cm and increase by 1.5cm for each one.
Tie a nut or washer to the end of each string.
Tape the strings along the dowel, evenly spaced about 3cm apart, from shortest to longest.
Make sure each pendulum can swing freely without hitting its neighbor.
Pull all the pendulums back to the same angle and release them simultaneously.
Watch the mesmerizing wave patterns that form as each pendulum swings at a different frequency.
Observe how the pattern changes over time — it will cycle through waves, chaos, and sync.
✅ Remember: Take your time with each step and ask an adult for help if needed!
The Science Behind It 🔬
Each pendulum has a different length, which means each one has a different natural frequency — shorter pendulums swing faster than longer ones. When released together, they start in sync but quickly go out of phase, creating beautiful wave-like patterns. This demonstrates the physics of simple harmonic motion and frequency. The patterns repeat in a cycle determined by the mathematical relationship between the pendulum lengths. This same principle is used in music, engineering, and even quantum physics! This variation explores the concept further by introducing new variables and measurements.