Hold a piece of paper by one corner.Wave it around.What happens?
Place a ruler on a desk. Extend half of it over the edge of the desk. Hold one end of the ruler down,and tap the other end. What happens?
Wrap a rubber band around a bowl.Pluck the rubber band. What happens?
Our conclusion is........they all made sounds because of vibrations.
- Plastic ruler
- Cardboard box.
- Rubber band