Students first explore how to create a vibrating device, by making a motor turn an unbalanced wheel. Then they create a noisemaker, by attaching a flap to a wheel, and forcing it to hit an obstacle each time it rotates.
What makes something vibrate?
Lead a class discussion about things that vibrate. List them on the chart. To get the discussion started, you might ask;
Develop the idea that whenever something is rotating, it will also vibrate if more weight is on one side than on the other. For example, a washing machine vibrates when the wash is piled up on one side of the basket. A cell phone has a little motor inside, with an off-center weight that vibrates when the motor is turned on.
Make a vibrator:
Demonstrate the vibrator you have made. Ask for ideas about what could be used as weights. Then distribute materials and provide time for students to make their own vibrators.
Ask the class: How could I use this same motor to make a noise? Develop the idea that if the wheel is hitting something, or making another object hit something, there will be a noise. Demonstrate how to attach a rubber band or flap of cardstock to the wheel, and challenge students to create their own noisemakers.
To make the vibrations stronger, try: