Cut the handle off of your tooth brush and stick your motor to the toothbrush neck.
Now add your battery using the sticky pad. Make sure the negative (black) contact for the motor is under the battery.
(Optional) Slide two flashing LEDs for eyes on to each side of the battery under the tape (the long contact must be on the top of the battery).
Tape down the other contact on the top of the battery, your bot should wobble around the table.
Science Behind It
The current that runs through the electrical circuit allow the motor to work; it shakes, which makes the toothbrush wobble around. The motor and the battery create an electrical current, flowing from positive through the motor and continuing to the negative side of the battery where the circuit will repeat until the battery runs out of power. The inside of the battery is filled with electrolytes. It is a chemical medium that allows the flow of electrical charge between the cathode (the negatively-charged electrode) and anode (the positively-charged electrode). When a device is connected to a battery — a motor or an electric circuit — chemical reactions occur on the electrodes that create a flow of electrical energy to the device. The motor is designed to to vibrate which is what causes the toothbrush to wobble.
Tips
This is a fairly quick project so we recommend that you do this with other projects at one meeting.