The popsicle is attached off-center on the motor. The extra weight pulls the motor as it spins, creating rotational vibration. This vibration vibrates your jitterbug, making it dance.
Offset motors are used in cell phones to make them vibrate when a call comes in. Try taking apart an old cell phone and trying to find the tiny motor that is used. You can connect a battery to it and watch it spin and vibrate.
Mess Kits are single-serving experiments that allow kids to explore scientific concepts at their own pace. Visitors are encouraged to complete as many as they want! See all Mess Kits.